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- /* vi: set sw=4 ts=4: */
- /*
- * sh.c -- a prototype Bourne shell grammar parser
- * Intended to follow the original Thompson and Ritchie
- * "small and simple is beautiful" philosophy, which
- * incidentally is a good match to today's BusyBox.
- *
- * Copyright (C) 2000,2001 Larry Doolittle <larry@doolittle.boa.org>
- *
- * Credits:
- * The parser routines proper are all original material, first
- * written Dec 2000 and Jan 2001 by Larry Doolittle. The
- * execution engine, the builtins, and much of the underlying
- * support has been adapted from busybox-0.49pre's lash, which is
- * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
- * written by Erik Andersen <andersen@codepoet.org>. That, in turn,
- * is based in part on ladsh.c, by Michael K. Johnson and Erik W.
- * Troan, which they placed in the public domain. I don't know
- * how much of the Johnson/Troan code has survived the repeated
- * rewrites.
- *
- * Other credits:
- * b_addchr() derived from similar w_addchar function in glibc-2.2
- * setup_redirect(), redirect_opt_num(), and big chunks of main()
- * and many builtins derived from contributions by Erik Andersen
- * miscellaneous bugfixes from Matt Kraai
- *
- * There are two big (and related) architecture differences between
- * this parser and the lash parser. One is that this version is
- * actually designed from the ground up to understand nearly all
- * of the Bourne grammar. The second, consequential change is that
- * the parser and input reader have been turned inside out. Now,
- * the parser is in control, and asks for input as needed. The old
- * way had the input reader in control, and it asked for parsing to
- * take place as needed. The new way makes it much easier to properly
- * handle the recursion implicit in the various substitutions, especially
- * across continuation lines.
- *
- * Bash grammar not implemented: (how many of these were in original sh?)
- * $@ (those sure look like weird quoting rules)
- * $_
- * ! negation operator for pipes
- * &> and >& redirection of stdout+stderr
- * Brace Expansion
- * Tilde Expansion
- * fancy forms of Parameter Expansion
- * aliases
- * Arithmetic Expansion
- * <(list) and >(list) Process Substitution
- * reserved words: case, esac, select, function
- * Here Documents ( << word )
- * Functions
- * Major bugs:
- * job handling woefully incomplete and buggy
- * reserved word execution woefully incomplete and buggy
- * to-do:
- * port selected bugfixes from post-0.49 busybox lash - done?
- * finish implementing reserved words: for, while, until, do, done
- * change { and } from special chars to reserved words
- * builtins: break, continue, eval, return, set, trap, ulimit
- * test magic exec
- * handle children going into background
- * clean up recognition of null pipes
- * check setting of global_argc and global_argv
- * control-C handling, probably with longjmp
- * follow IFS rules more precisely, including update semantics
- * figure out what to do with backslash-newline
- * explain why we use signal instead of sigaction
- * propagate syntax errors, die on resource errors?
- * continuation lines, both explicit and implicit - done?
- * memory leak finding and plugging - done?
- * more testing, especially quoting rules and redirection
- * document how quoting rules not precisely followed for variable assignments
- * maybe change map[] to use 2-bit entries
- * (eventually) remove all the printf's
- *
- * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
- */
- #include "busybox.h"
- #include <glob.h> /* glob, of course */
- #include <getopt.h> /* should be pretty obvious */
- //#include <sys/wait.h>
- //#include <signal.h>
- /* #include <dmalloc.h> */
- /* #define DEBUG_SHELL */
- #define SPECIAL_VAR_SYMBOL 03
- #define FLAG_EXIT_FROM_LOOP 1
- #define FLAG_PARSE_SEMICOLON (1 << 1) /* symbol ';' is special for parser */
- #define FLAG_REPARSING (1 << 2) /* >=2nd pass */
- typedef enum {
- REDIRECT_INPUT = 1,
- REDIRECT_OVERWRITE = 2,
- REDIRECT_APPEND = 3,
- REDIRECT_HEREIS = 4,
- REDIRECT_IO = 5
- } redir_type;
- /* The descrip member of this structure is only used to make debugging
- * output pretty */
- static const struct {
- int mode;
- int default_fd;
- const char *descrip;
- } redir_table[] = {
- { 0, 0, "()" },
- { O_RDONLY, 0, "<" },
- { O_CREAT|O_TRUNC|O_WRONLY, 1, ">" },
- { O_CREAT|O_APPEND|O_WRONLY, 1, ">>" },
- { O_RDONLY, -1, "<<" },
- { O_RDWR, 1, "<>" }
- };
- typedef enum {
- PIPE_SEQ = 1,
- PIPE_AND = 2,
- PIPE_OR = 3,
- PIPE_BG = 4,
- } pipe_style;
- /* might eventually control execution */
- typedef enum {
- RES_NONE = 0,
- RES_IF = 1,
- RES_THEN = 2,
- RES_ELIF = 3,
- RES_ELSE = 4,
- RES_FI = 5,
- RES_FOR = 6,
- RES_WHILE = 7,
- RES_UNTIL = 8,
- RES_DO = 9,
- RES_DONE = 10,
- RES_XXXX = 11,
- RES_IN = 12,
- RES_SNTX = 13
- } reserved_style;
- enum {
- FLAG_END = (1 << RES_NONE ),
- FLAG_IF = (1 << RES_IF ),
- FLAG_THEN = (1 << RES_THEN ),
- FLAG_ELIF = (1 << RES_ELIF ),
- FLAG_ELSE = (1 << RES_ELSE ),
- FLAG_FI = (1 << RES_FI ),
- FLAG_FOR = (1 << RES_FOR ),
- FLAG_WHILE = (1 << RES_WHILE),
- FLAG_UNTIL = (1 << RES_UNTIL),
- FLAG_DO = (1 << RES_DO ),
- FLAG_DONE = (1 << RES_DONE ),
- FLAG_IN = (1 << RES_IN ),
- FLAG_START = (1 << RES_XXXX ),
- };
- /* This holds pointers to the various results of parsing */
- struct p_context {
- struct child_prog *child;
- struct pipe *list_head;
- struct pipe *pipe;
- struct redir_struct *pending_redirect;
- reserved_style w;
- int old_flag; /* for figuring out valid reserved words */
- struct p_context *stack;
- int type; /* define type of parser : ";$" common or special symbol */
- /* How about quoting status? */
- };
- struct redir_struct {
- redir_type type; /* type of redirection */
- int fd; /* file descriptor being redirected */
- int dup; /* -1, or file descriptor being duplicated */
- struct redir_struct *next; /* pointer to the next redirect in the list */
- glob_t word; /* *word.gl_pathv is the filename */
- };
- struct child_prog {
- pid_t pid; /* 0 if exited */
- char **argv; /* program name and arguments */
- struct pipe *group; /* if non-NULL, first in group or subshell */
- int subshell; /* flag, non-zero if group must be forked */
- struct redir_struct *redirects; /* I/O redirections */
- glob_t glob_result; /* result of parameter globbing */
- int is_stopped; /* is the program currently running? */
- struct pipe *family; /* pointer back to the child's parent pipe */
- int sp; /* number of SPECIAL_VAR_SYMBOL */
- int type;
- };
- struct pipe {
- int jobid; /* job number */
- int num_progs; /* total number of programs in job */
- int running_progs; /* number of programs running */
- char *text; /* name of job */
- char *cmdbuf; /* buffer various argv's point into */
- pid_t pgrp; /* process group ID for the job */
- struct child_prog *progs; /* array of commands in pipe */
- struct pipe *next; /* to track background commands */
- int stopped_progs; /* number of programs alive, but stopped */
- int job_context; /* bitmask defining current context */
- pipe_style followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */
- reserved_style r_mode; /* supports if, for, while, until */
- };
- struct close_me {
- int fd;
- struct close_me *next;
- };
- struct variables {
- const char *name;
- const char *value;
- int flg_export;
- int flg_read_only;
- struct variables *next;
- };
- /* globals, connect us to the outside world
- * the first three support $?, $#, and $1 */
- static char **global_argv;
- static int global_argc;
- static int last_return_code;
- extern char **environ; /* This is in <unistd.h>, but protected with __USE_GNU */
- /* "globals" within this file */
- static const char *ifs;
- static unsigned char map[256];
- static int fake_mode;
- static int interactive;
- static struct close_me *close_me_head;
- static const char *cwd;
- static struct pipe *job_list;
- static unsigned last_bg_pid;
- static int last_jobid;
- static unsigned shell_terminal;
- static const char *PS1;
- static const char *PS2;
- static struct variables shell_ver = { "HUSH_VERSION", "0.01", 1, 1, 0 };
- static struct variables *top_vars = &shell_ver;
- #define B_CHUNK (100)
- #define B_NOSPAC 1
- typedef struct {
- char *data;
- int length;
- int maxlen;
- int quote;
- int nonnull;
- } o_string;
- #define NULL_O_STRING {NULL,0,0,0,0}
- /* used for initialization:
- o_string foo = NULL_O_STRING; */
- /* I can almost use ordinary FILE *. Is open_memstream() universally
- * available? Where is it documented? */
- struct in_str {
- const char *p;
- char peek_buf[2];
- int __promptme;
- int promptmode;
- FILE *file;
- int (*get) (struct in_str *);
- int (*peek) (struct in_str *);
- };
- #define b_getch(input) ((input)->get(input))
- #define b_peek(input) ((input)->peek(input))
- #define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n"
- struct built_in_command {
- const char *cmd; /* name */
- const char *descr; /* description */
- int (*function) (struct child_prog *); /* function ptr */
- };
- /* belongs in busybox.h */
- static int max(int a, int b)
- {
- return (a > b) ? a : b;
- }
- /* This should be in utility.c */
- #ifdef DEBUG_SHELL
- static void debug_printf(const char *format, ...)
- {
- va_list args;
- va_start(args, format);
- vfprintf(stderr, format, args);
- va_end(args);
- }
- /* broken, of course, but OK for testing */
- static char *indenter(int i)
- {
- static char blanks[] = " ";
- return &blanks[sizeof(blanks)-i-1];
- }
- #else
- #define debug_printf(...) do {} while (0)
- #endif
- #define final_printf debug_printf
- static void __syntax(const char *file, int line)
- {
- bb_error_msg("syntax error %s:%d", file, line);
- }
- // NB: was __FILE__, but that produces full path sometimes, so...
- #define syntax() __syntax("hush.c", __LINE__)
- /* Index of subroutines: */
- /* function prototypes for builtins */
- static int builtin_cd(struct child_prog *child);
- static int builtin_env(struct child_prog *child);
- static int builtin_eval(struct child_prog *child);
- static int builtin_exec(struct child_prog *child);
- static int builtin_exit(struct child_prog *child);
- static int builtin_export(struct child_prog *child);
- static int builtin_fg_bg(struct child_prog *child);
- static int builtin_help(struct child_prog *child);
- static int builtin_jobs(struct child_prog *child);
- static int builtin_pwd(struct child_prog *child);
- static int builtin_read(struct child_prog *child);
- static int builtin_set(struct child_prog *child);
- static int builtin_shift(struct child_prog *child);
- static int builtin_source(struct child_prog *child);
- static int builtin_umask(struct child_prog *child);
- static int builtin_unset(struct child_prog *child);
- static int builtin_not_written(struct child_prog *child);
- /* o_string manipulation: */
- static int b_check_space(o_string *o, int len);
- static int b_addchr(o_string *o, int ch);
- static void b_reset(o_string *o);
- static int b_addqchr(o_string *o, int ch, int quote);
- static int b_adduint(o_string *o, unsigned i);
- /* in_str manipulations: */
- static int static_get(struct in_str *i);
- static int static_peek(struct in_str *i);
- static int file_get(struct in_str *i);
- static int file_peek(struct in_str *i);
- static void setup_file_in_str(struct in_str *i, FILE *f);
- static void setup_string_in_str(struct in_str *i, const char *s);
- /* close_me manipulations: */
- static void mark_open(int fd);
- static void mark_closed(int fd);
- static void close_all(void);
- /* "run" the final data structures: */
- static int free_pipe_list(struct pipe *head, int indent);
- static int free_pipe(struct pipe *pi, int indent);
- /* really run the final data structures: */
- static int setup_redirects(struct child_prog *prog, int squirrel[]);
- static int run_list_real(struct pipe *pi);
- static void pseudo_exec(struct child_prog *child) ATTRIBUTE_NORETURN;
- static int run_pipe_real(struct pipe *pi);
- /* extended glob support: */
- static int globhack(const char *src, int flags, glob_t *pglob);
- static int glob_needed(const char *s);
- static int xglob(o_string *dest, int flags, glob_t *pglob);
- /* variable assignment: */
- static int is_assignment(const char *s);
- /* data structure manipulation: */
- static int setup_redirect(struct p_context *ctx, int fd, redir_type style, struct in_str *input);
- static void initialize_context(struct p_context *ctx);
- static int done_word(o_string *dest, struct p_context *ctx);
- static int done_command(struct p_context *ctx);
- static int done_pipe(struct p_context *ctx, pipe_style type);
- /* primary string parsing: */
- static int redirect_dup_num(struct in_str *input);
- static int redirect_opt_num(o_string *o);
- static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end);
- static int parse_group(o_string *dest, struct p_context *ctx, struct in_str *input, int ch);
- static const char *lookup_param(const char *src);
- static char *make_string(char **inp);
- static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input);
- static int parse_string(o_string *dest, struct p_context *ctx, const char *src);
- static int parse_stream(o_string *dest, struct p_context *ctx, struct in_str *input0, int end_trigger);
- /* setup: */
- static int parse_stream_outer(struct in_str *inp, int flag);
- static int parse_string_outer(const char *s, int flag);
- static int parse_file_outer(FILE *f);
- /* job management: */
- static int checkjobs(struct pipe* fg_pipe);
- static void insert_bg_job(struct pipe *pi);
- static void remove_bg_job(struct pipe *pi);
- /* local variable support */
- static char **make_list_in(char **inp, char *name);
- static char *insert_var_value(char *inp);
- static const char *get_local_var(const char *var);
- static void unset_local_var(const char *name);
- static int set_local_var(const char *s, int flg_export);
- /* Table of built-in functions. They can be forked or not, depending on
- * context: within pipes, they fork. As simple commands, they do not.
- * When used in non-forking context, they can change global variables
- * in the parent shell process. If forked, of course they cannot.
- * For example, 'unset foo | whatever' will parse and run, but foo will
- * still be set at the end. */
- static const struct built_in_command bltins[] = {
- { "bg", "Resume a job in the background", builtin_fg_bg },
- { "break", "Exit for, while or until loop", builtin_not_written },
- { "cd", "Change working directory", builtin_cd },
- { "continue", "Continue for, while or until loop", builtin_not_written },
- { "env", "Print all environment variables", builtin_env },
- { "eval", "Construct and run shell command", builtin_eval },
- { "exec", "Exec command, replacing this shell with the exec'd process",
- builtin_exec },
- { "exit", "Exit from shell()", builtin_exit },
- { "export", "Set environment variable", builtin_export },
- { "fg", "Bring job into the foreground", builtin_fg_bg },
- { "jobs", "Lists the active jobs", builtin_jobs },
- { "pwd", "Print current directory", builtin_pwd },
- { "read", "Input environment variable", builtin_read },
- { "return", "Return from a function", builtin_not_written },
- { "set", "Set/unset shell local variables", builtin_set },
- { "shift", "Shift positional parameters", builtin_shift },
- { "trap", "Trap signals", builtin_not_written },
- { "ulimit","Controls resource limits", builtin_not_written },
- { "umask","Sets file creation mask", builtin_umask },
- { "unset", "Unset environment variable", builtin_unset },
- { ".", "Source-in and run commands in a file", builtin_source },
- { "help", "List shell built-in commands", builtin_help },
- { NULL, NULL, NULL }
- };
- static const char *set_cwd(void)
- {
- if (cwd == bb_msg_unknown)
- cwd = NULL; /* xrealloc_getcwd_or_warn(arg) calls free(arg)! */
- cwd = xrealloc_getcwd_or_warn((char *)cwd);
- if (!cwd)
- cwd = bb_msg_unknown;
- return cwd;
- }
- /* built-in 'eval' handler */
- static int builtin_eval(struct child_prog *child)
- {
- char *str = NULL;
- int rcode = EXIT_SUCCESS;
- if (child->argv[1]) {
- str = make_string(child->argv + 1);
- parse_string_outer(str, FLAG_EXIT_FROM_LOOP |
- FLAG_PARSE_SEMICOLON);
- free(str);
- rcode = last_return_code;
- }
- return rcode;
- }
- /* built-in 'cd <path>' handler */
- static int builtin_cd(struct child_prog *child)
- {
- char *newdir;
- if (child->argv[1] == NULL)
- newdir = getenv("HOME");
- else
- newdir = child->argv[1];
- if (chdir(newdir)) {
- printf("cd: %s: %s\n", newdir, strerror(errno));
- return EXIT_FAILURE;
- }
- set_cwd();
- return EXIT_SUCCESS;
- }
- /* built-in 'env' handler */
- static int builtin_env(struct child_prog *dummy ATTRIBUTE_UNUSED)
- {
- /* TODO: call env applet's code instead */
- char **e = environ;
- if (e == NULL)
- return EXIT_FAILURE;
- while (*e) {
- puts(*e++);
- }
- return EXIT_SUCCESS;
- }
- /* built-in 'exec' handler */
- static int builtin_exec(struct child_prog *child)
- {
- if (child->argv[1] == NULL)
- return EXIT_SUCCESS; /* Really? */
- child->argv++;
- pseudo_exec(child);
- /* never returns */
- }
- /* built-in 'exit' handler */
- static int builtin_exit(struct child_prog *child)
- {
- /* bash prints "exit\n" here, then: */
- if (child->argv[1] == NULL)
- exit(last_return_code);
- /* mimic bash: exit 123abc == exit 255 + error msg */
- xfunc_error_retval = 255;
- /* bash: exit -2 == exit 254, no error msg */
- exit(xatoi(child->argv[1]));
- }
- /* built-in 'export VAR=value' handler */
- static int builtin_export(struct child_prog *child)
- {
- int res = 0;
- char *name = child->argv[1];
- if (name == NULL) {
- return builtin_env(child);
- }
- name = strdup(name);
- if (name) {
- const char *value = strchr(name, '=');
- if (!value) {
- char *tmp;
- /* They are exporting something without an =VALUE */
- value = get_local_var(name);
- if (value) {
- size_t ln = strlen(name);
- tmp = realloc(name, ln+strlen(value)+2);
- if (tmp == NULL)
- res = -1;
- else {
- sprintf(tmp+ln, "=%s", value);
- name = tmp;
- }
- } else {
- /* bash does not return an error when trying to export
- * an undefined variable. Do likewise. */
- res = 1;
- }
- }
- }
- if (res < 0)
- bb_perror_msg("export");
- else if (res == 0)
- res = set_local_var(name, 1);
- else
- res = 0;
- free(name);
- return res;
- }
- /* built-in 'fg' and 'bg' handler */
- static int builtin_fg_bg(struct child_prog *child)
- {
- int i, jobnum;
- struct pipe *pi;
- if (!interactive)
- return EXIT_FAILURE;
- /* If they gave us no args, assume they want the last backgrounded task */
- if (!child->argv[1]) {
- for (pi = job_list; pi; pi = pi->next) {
- if (pi->jobid == last_jobid) {
- goto found;
- }
- }
- bb_error_msg("%s: no current job", child->argv[0]);
- return EXIT_FAILURE;
- }
- if (sscanf(child->argv[1], "%%%d", &jobnum) != 1) {
- bb_error_msg("%s: bad argument '%s'", child->argv[0], child->argv[1]);
- return EXIT_FAILURE;
- }
- for (pi = job_list; pi; pi = pi->next) {
- if (pi->jobid == jobnum) {
- goto found;
- }
- }
- bb_error_msg("%s: %d: no such job", child->argv[0], jobnum);
- return EXIT_FAILURE;
- found:
- if (*child->argv[0] == 'f') {
- /* Put the job into the foreground. */
- tcsetpgrp(shell_terminal, pi->pgrp);
- }
- /* Restart the processes in the job */
- for (i = 0; i < pi->num_progs; i++)
- pi->progs[i].is_stopped = 0;
- i = kill(- pi->pgrp, SIGCONT);
- if (i < 0) {
- if (errno == ESRCH) {
- remove_bg_job(pi);
- } else {
- bb_perror_msg("kill (SIGCONT)");
- }
- }
- pi->stopped_progs = 0;
- return EXIT_SUCCESS;
- }
- /* built-in 'help' handler */
- static int builtin_help(struct child_prog *dummy ATTRIBUTE_UNUSED)
- {
- const struct built_in_command *x;
- printf("\nBuilt-in commands:\n");
- printf("-------------------\n");
- for (x = bltins; x->cmd; x++) {
- if (x->descr == NULL)
- continue;
- printf("%s\t%s\n", x->cmd, x->descr);
- }
- printf("\n\n");
- return EXIT_SUCCESS;
- }
- /* built-in 'jobs' handler */
- static int builtin_jobs(struct child_prog *child ATTRIBUTE_UNUSED)
- {
- struct pipe *job;
- const char *status_string;
- for (job = job_list; job; job = job->next) {
- if (job->running_progs == job->stopped_progs)
- status_string = "Stopped";
- else
- status_string = "Running";
- printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->text);
- }
- return EXIT_SUCCESS;
- }
- /* built-in 'pwd' handler */
- static int builtin_pwd(struct child_prog *dummy ATTRIBUTE_UNUSED)
- {
- puts(set_cwd());
- return EXIT_SUCCESS;
- }
- /* built-in 'read VAR' handler */
- static int builtin_read(struct child_prog *child)
- {
- int res;
- if (child->argv[1]) {
- char string[BUFSIZ];
- char *var = NULL;
- string[0] = '\0'; /* In case stdin has only EOF */
- /* read string */
- fgets(string, sizeof(string), stdin);
- chomp(string);
- var = malloc(strlen(child->argv[1]) + strlen(string) + 2);
- if (var) {
- sprintf(var, "%s=%s", child->argv[1], string);
- res = set_local_var(var, 0);
- } else
- res = -1;
- if (res)
- bb_perror_msg("read");
- free(var); /* So not move up to avoid breaking errno */
- return res;
- }
- do res = getchar(); while (res != '\n' && res != EOF);
- return 0;
- }
- /* built-in 'set VAR=value' handler */
- static int builtin_set(struct child_prog *child)
- {
- char *temp = child->argv[1];
- struct variables *e;
- if (temp == NULL)
- for (e = top_vars; e; e = e->next)
- printf("%s=%s\n", e->name, e->value);
- else
- set_local_var(temp, 0);
- return EXIT_SUCCESS;
- }
- /* Built-in 'shift' handler */
- static int builtin_shift(struct child_prog *child)
- {
- int n = 1;
- if (child->argv[1]) {
- n = atoi(child->argv[1]);
- }
- if (n >= 0 && n < global_argc) {
- /* XXX This probably breaks $0 */
- global_argc -= n;
- global_argv += n;
- return EXIT_SUCCESS;
- }
- return EXIT_FAILURE;
- }
- /* Built-in '.' handler (read-in and execute commands from file) */
- static int builtin_source(struct child_prog *child)
- {
- FILE *input;
- int status;
- if (child->argv[1] == NULL)
- return EXIT_FAILURE;
- /* XXX search through $PATH is missing */
- input = fopen(child->argv[1], "r");
- if (!input) {
- bb_error_msg("cannot open '%s'", child->argv[1]);
- return EXIT_FAILURE;
- }
- /* Now run the file */
- /* XXX argv and argc are broken; need to save old global_argv
- * (pointer only is OK!) on this stack frame,
- * set global_argv=child->argv+1, recurse, and restore. */
- mark_open(fileno(input));
- status = parse_file_outer(input);
- mark_closed(fileno(input));
- fclose(input);
- return status;
- }
- static int builtin_umask(struct child_prog *child)
- {
- mode_t new_umask;
- const char *arg = child->argv[1];
- char *end;
- if (arg) {
- new_umask = strtoul(arg, &end, 8);
- if (*end != '\0' || end == arg) {
- return EXIT_FAILURE;
- }
- } else {
- new_umask = umask(0);
- printf("%.3o\n", (unsigned) new_umask);
- }
- umask(new_umask);
- return EXIT_SUCCESS;
- }
- /* built-in 'unset VAR' handler */
- static int builtin_unset(struct child_prog *child)
- {
- /* bash returned already true */
- unset_local_var(child->argv[1]);
- return EXIT_SUCCESS;
- }
- static int builtin_not_written(struct child_prog *child)
- {
- printf("builtin_%s not written\n", child->argv[0]);
- return EXIT_FAILURE;
- }
- static int b_check_space(o_string *o, int len)
- {
- /* It would be easy to drop a more restrictive policy
- * in here, such as setting a maximum string length */
- if (o->length + len > o->maxlen) {
- char *old_data = o->data;
- /* assert(data == NULL || o->maxlen != 0); */
- o->maxlen += max(2*len, B_CHUNK);
- o->data = realloc(o->data, 1 + o->maxlen);
- if (o->data == NULL) {
- free(old_data);
- }
- }
- return o->data == NULL;
- }
- static int b_addchr(o_string *o, int ch)
- {
- debug_printf("b_addchr: %c %d %p\n", ch, o->length, o);
- if (b_check_space(o, 1))
- return B_NOSPAC;
- o->data[o->length] = ch;
- o->length++;
- o->data[o->length] = '\0';
- return 0;
- }
- static void b_reset(o_string *o)
- {
- o->length = 0;
- o->nonnull = 0;
- if (o->data != NULL)
- *o->data = '\0';
- }
- static void b_free(o_string *o)
- {
- b_reset(o);
- free(o->data);
- o->data = NULL;
- o->maxlen = 0;
- }
- /* My analysis of quoting semantics tells me that state information
- * is associated with a destination, not a source.
- */
- static int b_addqchr(o_string *o, int ch, int quote)
- {
- if (quote && strchr("*?[\\", ch)) {
- int rc;
- rc = b_addchr(o, '\\');
- if (rc)
- return rc;
- }
- return b_addchr(o, ch);
- }
- static int b_adduint(o_string *o, unsigned i)
- {
- int r;
- char buf[sizeof(unsigned)*3 + 1];
- char *p = buf;
- *(utoa_to_buf(i, buf, sizeof(buf))) = '\0';
- /* no escape checking necessary */
- do r = b_addchr(o, *p++); while (r == 0 && *p);
- return r;
- }
- static int static_get(struct in_str *i)
- {
- int ch = *i->p++;
- if (ch == '\0') return EOF;
- return ch;
- }
- static int static_peek(struct in_str *i)
- {
- return *i->p;
- }
- static void cmdedit_set_initial_prompt(void)
- {
- #if !ENABLE_FEATURE_EDITING_FANCY_PROMPT
- PS1 = NULL;
- #else
- PS1 = getenv("PS1");
- if (PS1 == NULL)
- PS1 = "\\w \\$ ";
- #endif
- }
- static const char* setup_prompt_string(int promptmode)
- {
- const char *prompt_str;
- debug_printf("setup_prompt_string %d ", promptmode);
- #if !ENABLE_FEATURE_EDITING_FANCY_PROMPT
- /* Set up the prompt */
- if (promptmode == 1) {
- char *ns;
- free((char*)PS1);
- ns = xmalloc(strlen(cwd)+4);
- sprintf(ns, "%s %s", cwd, (geteuid() != 0) ? "$ " : "# ");
- prompt_str = ns;
- PS1 = ns;
- } else {
- prompt_str = PS2;
- }
- #else
- prompt_str = (promptmode == 1) ? PS1 : PS2;
- #endif
- debug_printf("result %s\n", prompt_str);
- return prompt_str;
- }
- #if ENABLE_FEATURE_EDITING
- static line_input_t *line_input_state;
- #endif
- static void get_user_input(struct in_str *i)
- {
- const char *prompt_str;
- static char the_command[BUFSIZ];
- prompt_str = setup_prompt_string(i->promptmode);
- #if ENABLE_FEATURE_EDITING
- /*
- ** enable command line editing only while a command line
- ** is actually being read; otherwise, we'll end up bequeathing
- ** atexit() handlers and other unwanted stuff to our
- ** child processes (rob@sysgo.de)
- */
- read_line_input(prompt_str, the_command, BUFSIZ, line_input_state);
- #else
- fputs(prompt_str, stdout);
- fflush(stdout);
- the_command[0] = fgetc(i->file);
- the_command[1] = '\0';
- #endif
- fflush(stdout);
- i->p = the_command;
- }
- /* This is the magic location that prints prompts
- * and gets data back from the user */
- static int file_get(struct in_str *i)
- {
- int ch;
- ch = 0;
- /* If there is data waiting, eat it up */
- if (i->p && *i->p) {
- ch = *i->p++;
- } else {
- /* need to double check i->file because we might be doing something
- * more complicated by now, like sourcing or substituting. */
- if (i->__promptme && interactive && i->file == stdin) {
- while (!i->p || !(interactive && strlen(i->p))) {
- get_user_input(i);
- }
- i->promptmode = 2;
- i->__promptme = 0;
- if (i->p && *i->p) {
- ch = *i->p++;
- }
- } else {
- ch = fgetc(i->file);
- }
- debug_printf("b_getch: got a %d\n", ch);
- }
- if (ch == '\n')
- i->__promptme = 1;
- return ch;
- }
- /* All the callers guarantee this routine will never be
- * used right after a newline, so prompting is not needed.
- */
- static int file_peek(struct in_str *i)
- {
- if (i->p && *i->p) {
- return *i->p;
- }
- i->peek_buf[0] = fgetc(i->file);
- i->peek_buf[1] = '\0';
- i->p = i->peek_buf;
- debug_printf("b_peek: got a %d\n", *i->p);
- return *i->p;
- }
- static void setup_file_in_str(struct in_str *i, FILE *f)
- {
- i->peek = file_peek;
- i->get = file_get;
- i->__promptme = 1;
- i->promptmode = 1;
- i->file = f;
- i->p = NULL;
- }
- static void setup_string_in_str(struct in_str *i, const char *s)
- {
- i->peek = static_peek;
- i->get = static_get;
- i->__promptme = 1;
- i->promptmode = 1;
- i->p = s;
- }
- static void mark_open(int fd)
- {
- struct close_me *new = xmalloc(sizeof(struct close_me));
- new->fd = fd;
- new->next = close_me_head;
- close_me_head = new;
- }
- static void mark_closed(int fd)
- {
- struct close_me *tmp;
- if (close_me_head == NULL || close_me_head->fd != fd)
- bb_error_msg_and_die("corrupt close_me");
- tmp = close_me_head;
- close_me_head = close_me_head->next;
- free(tmp);
- }
- static void close_all(void)
- {
- struct close_me *c;
- for (c = close_me_head; c; c = c->next) {
- close(c->fd);
- }
- close_me_head = NULL;
- }
- /* squirrel != NULL means we squirrel away copies of stdin, stdout,
- * and stderr if they are redirected. */
- static int setup_redirects(struct child_prog *prog, int squirrel[])
- {
- int openfd, mode;
- struct redir_struct *redir;
- for (redir = prog->redirects; redir; redir = redir->next) {
- if (redir->dup == -1 && redir->word.gl_pathv == NULL) {
- /* something went wrong in the parse. Pretend it didn't happen */
- continue;
- }
- if (redir->dup == -1) {
- mode = redir_table[redir->type].mode;
- openfd = open_or_warn(redir->word.gl_pathv[0], mode);
- if (openfd < 0) {
- /* this could get lost if stderr has been redirected, but
- bash and ash both lose it as well (though zsh doesn't!) */
- return 1;
- }
- } else {
- openfd = redir->dup;
- }
- if (openfd != redir->fd) {
- if (squirrel && redir->fd < 3) {
- squirrel[redir->fd] = dup(redir->fd);
- }
- if (openfd == -3) {
- close(openfd);
- } else {
- dup2(openfd, redir->fd);
- if (redir->dup == -1)
- close(openfd);
- }
- }
- }
- return 0;
- }
- static void restore_redirects(int squirrel[])
- {
- int i, fd;
- for (i = 0; i < 3; i++) {
- fd = squirrel[i];
- if (fd != -1) {
- /* No error checking. I sure wouldn't know what
- * to do with an error if I found one! */
- dup2(fd, i);
- close(fd);
- }
- }
- }
- /* never returns */
- /* XXX no exit() here. If you don't exec, use _exit instead.
- * The at_exit handlers apparently confuse the calling process,
- * in particular stdin handling. Not sure why? */
- static void pseudo_exec(struct child_prog *child)
- {
- int i, rcode;
- char *p;
- const struct built_in_command *x;
- if (child->argv) {
- for (i = 0; is_assignment(child->argv[i]); i++) {
- debug_printf("pid %d environment modification: %s\n",
- getpid(), child->argv[i]);
- p = insert_var_value(child->argv[i]);
- putenv(strdup(p));
- if (p != child->argv[i])
- free(p);
- }
- child->argv += i; /* XXX this hack isn't so horrible, since we are about
- to exit, and therefore don't need to keep data
- structures consistent for free() use. */
- /* If a variable is assigned in a forest, and nobody listens,
- * was it ever really set?
- */
- if (child->argv[0] == NULL) {
- _exit(EXIT_SUCCESS);
- }
- /*
- * Check if the command matches any of the builtins.
- * Depending on context, this might be redundant. But it's
- * easier to waste a few CPU cycles than it is to figure out
- * if this is one of those cases.
- */
- for (x = bltins; x->cmd; x++) {
- if (strcmp(child->argv[0], x->cmd) == 0) {
- debug_printf("builtin exec %s\n", child->argv[0]);
- rcode = x->function(child);
- fflush(stdout);
- _exit(rcode);
- }
- }
- /* Check if the command matches any busybox internal commands
- * ("applets") here.
- * FIXME: This feature is not 100% safe, since
- * BusyBox is not fully reentrant, so we have no guarantee the things
- * from the .bss are still zeroed, or that things from .data are still
- * at their defaults. We could exec ourself from /proc/self/exe, but I
- * really dislike relying on /proc for things. We could exec ourself
- * from global_argv[0], but if we are in a chroot, we may not be able
- * to find ourself... */
- #if ENABLE_FEATURE_SH_STANDALONE
- debug_printf("running applet %s\n", child->argv[0]);
- run_applet_and_exit(child->argv[0], child->argv);
- // is it ok that run_applet_and_exit() does exit(), not _exit()?
- // NB: IIRC on NOMMU we are after _vfork_, not fork!
- #endif
- debug_printf("exec of %s\n", child->argv[0]);
- execvp(child->argv[0], child->argv);
- bb_perror_msg("cannot exec: %s", child->argv[0]);
- _exit(1);
- }
- if (child->group) {
- debug_printf("runtime nesting to group\n");
- interactive = 0; /* crucial!!!! */
- rcode = run_list_real(child->group);
- /* OK to leak memory by not calling free_pipe_list,
- * since this process is about to exit */
- _exit(rcode);
- }
- /* Can happen. See what bash does with ">foo" by itself. */
- debug_printf("trying to pseudo_exec null command\n");
- _exit(EXIT_SUCCESS);
- }
- static void insert_bg_job(struct pipe *pi)
- {
- struct pipe *thejob;
- /* Linear search for the ID of the job to use */
- pi->jobid = 1;
- for (thejob = job_list; thejob; thejob = thejob->next)
- if (thejob->jobid >= pi->jobid)
- pi->jobid = thejob->jobid + 1;
- /* add thejob to the list of running jobs */
- if (!job_list) {
- thejob = job_list = xmalloc(sizeof(*thejob));
- } else {
- for (thejob = job_list; thejob->next; thejob = thejob->next)
- continue;
- thejob->next = xmalloc(sizeof(*thejob));
- thejob = thejob->next;
- }
- /* physically copy the struct job */
- memcpy(thejob, pi, sizeof(struct pipe));
- thejob->next = NULL;
- thejob->running_progs = thejob->num_progs;
- thejob->stopped_progs = 0;
- thejob->text = xmalloc(BUFSIZ); /* cmdedit buffer size */
- //if (pi->progs[0] && pi->progs[0].argv && pi->progs[0].argv[0])
- {
- char *bar = thejob->text;
- char **foo = pi->progs[0].argv;
- if (foo)
- while (*foo)
- bar += sprintf(bar, "%s ", *foo++);
- }
- /* we don't wait for background thejobs to return -- append it
- to the list of backgrounded thejobs and leave it alone */
- printf("[%d] %d\n", thejob->jobid, thejob->progs[0].pid);
- last_bg_pid = thejob->progs[0].pid;
- last_jobid = thejob->jobid;
- }
- /* remove a backgrounded job */
- static void remove_bg_job(struct pipe *pi)
- {
- struct pipe *prev_pipe;
- if (pi == job_list) {
- job_list = pi->next;
- } else {
- prev_pipe = job_list;
- while (prev_pipe->next != pi)
- prev_pipe = prev_pipe->next;
- prev_pipe->next = pi->next;
- }
- if (job_list)
- last_jobid = job_list->jobid;
- else
- last_jobid = 0;
- pi->stopped_progs = 0;
- free_pipe(pi, 0);
- free(pi);
- }
- /* Checks to see if any processes have exited -- if they
- have, figure out why and see if a job has completed */
- static int checkjobs(struct pipe* fg_pipe)
- {
- int attributes;
- int status;
- int prognum = 0;
- struct pipe *pi;
- pid_t childpid;
- attributes = WUNTRACED;
- if (fg_pipe == NULL) {
- attributes |= WNOHANG;
- }
- while ((childpid = waitpid(-1, &status, attributes)) > 0) {
- if (fg_pipe) {
- int i, rcode = 0;
- for (i = 0; i < fg_pipe->num_progs; i++) {
- if (fg_pipe->progs[i].pid == childpid) {
- if (i == fg_pipe->num_progs-1)
- rcode = WEXITSTATUS(status);
- fg_pipe->num_progs--;
- return rcode;
- }
- }
- }
- for (pi = job_list; pi; pi = pi->next) {
- prognum = 0;
- while (prognum < pi->num_progs) {
- if (pi->progs[prognum].pid == childpid)
- goto found_pi_and_prognum;
- prognum++;
- }
- }
- /* Happens when shell is used as init process (init=/bin/sh) */
- debug_printf("checkjobs: pid %d was not in our list!\n", childpid);
- continue;
- found_pi_and_prognum:
- if (WIFEXITED(status) || WIFSIGNALED(status)) {
- /* child exited */
- pi->running_progs--;
- pi->progs[prognum].pid = 0;
- if (!pi->running_progs) {
- printf(JOB_STATUS_FORMAT, pi->jobid,
- "Done", pi->text);
- remove_bg_job(pi);
- }
- } else {
- /* child stopped */
- pi->stopped_progs++;
- pi->progs[prognum].is_stopped = 1;
- }
- }
- if (childpid == -1 && errno != ECHILD)
- bb_perror_msg("waitpid");
- /* move the shell to the foreground */
- //if (interactive && tcsetpgrp(shell_terminal, getpgid(0)))
- // bb_perror_msg("tcsetpgrp-2");
- return -1;
- }
- /* run_pipe_real() starts all the jobs, but doesn't wait for anything
- * to finish. See checkjobs().
- *
- * return code is normally -1, when the caller has to wait for children
- * to finish to determine the exit status of the pipe. If the pipe
- * is a simple builtin command, however, the action is done by the
- * time run_pipe_real returns, and the exit code is provided as the
- * return value.
- *
- * The input of the pipe is always stdin, the output is always
- * stdout. The outpipe[] mechanism in BusyBox-0.48 lash is bogus,
- * because it tries to avoid running the command substitution in
- * subshell, when that is in fact necessary. The subshell process
- * now has its stdout directed to the input of the appropriate pipe,
- * so this routine is noticeably simpler.
- */
- static int run_pipe_real(struct pipe *pi)
- {
- int i;
- int nextin, nextout;
- int pipefds[2]; /* pipefds[0] is for reading */
- struct child_prog *child;
- const struct built_in_command *x;
- char *p;
- /* it is not always needed, but we aim to smaller code */
- int squirrel[] = { -1, -1, -1 };
- int rcode;
- nextin = 0;
- pi->pgrp = -1;
- /* Check if this is a simple builtin (not part of a pipe).
- * Builtins within pipes have to fork anyway, and are handled in
- * pseudo_exec. "echo foo | read bar" doesn't work on bash, either.
- */
- child = &(pi->progs[0]);
- if (pi->num_progs == 1 && child->group && child->subshell == 0) {
- debug_printf("non-subshell grouping\n");
- setup_redirects(child, squirrel);
- /* XXX could we merge code with following builtin case,
- * by creating a pseudo builtin that calls run_list_real? */
- rcode = run_list_real(child->group);
- restore_redirects(squirrel);
- return rcode;
- }
- if (pi->num_progs == 1 && pi->progs[0].argv != NULL) {
- for (i = 0; is_assignment(child->argv[i]); i++)
- continue;
- if (i != 0 && child->argv[i] == NULL) {
- /* assignments, but no command: set the local environment */
- for (i = 0; child->argv[i] != NULL; i++) {
- /* Ok, this case is tricky. We have to decide if this is a
- * local variable, or an already exported variable. If it is
- * already exported, we have to export the new value. If it is
- * not exported, we need only set this as a local variable.
- * This junk is all to decide whether or not to export this
- * variable. */
- int export_me = 0;
- char *name, *value;
- name = xstrdup(child->argv[i]);
- debug_printf("Local environment set: %s\n", name);
- value = strchr(name, '=');
- if (value)
- *value = 0;
- if (get_local_var(name)) {
- export_me = 1;
- }
- free(name);
- p = insert_var_value(child->argv[i]);
- set_local_var(p, export_me);
- if (p != child->argv[i])
- free(p);
- }
- return EXIT_SUCCESS; /* don't worry about errors in set_local_var() yet */
- }
- for (i = 0; is_assignment(child->argv[i]); i++) {
- p = insert_var_value(child->argv[i]);
- putenv(strdup(p));
- if (p != child->argv[i]) {
- child->sp--;
- free(p);
- }
- }
- if (child->sp) {
- char *str;
- str = make_string(child->argv + i);
- parse_string_outer(str, FLAG_EXIT_FROM_LOOP | FLAG_REPARSING);
- free(str);
- return last_return_code;
- }
- for (x = bltins; x->cmd; x++) {
- if (strcmp(child->argv[i], x->cmd) == 0) {
- if (x->function == builtin_exec && child->argv[i+1] == NULL) {
- debug_printf("magic exec\n");
- setup_redirects(child, NULL);
- return EXIT_SUCCESS;
- }
- debug_printf("builtin inline %s\n", child->argv[0]);
- /* XXX setup_redirects acts on file descriptors, not FILEs.
- * This is perfect for work that comes after exec().
- * Is it really safe for inline use? Experimentally,
- * things seem to work with glibc. */
- setup_redirects(child, squirrel);
- child->argv += i; /* XXX horrible hack */
- rcode = x->function(child);
- child->argv -= i; /* XXX restore hack so free() can work right */
- restore_redirects(squirrel);
- return rcode;
- }
- }
- #if ENABLE_FEATURE_SH_STANDALONE
- {
- const struct bb_applet *a = find_applet_by_name(child->argv[i]);
- if (a && a->nofork) {
- setup_redirects(child, squirrel);
- rcode = run_nofork_applet(a, child->argv + i);
- restore_redirects(squirrel);
- return rcode;
- }
- }
- #endif
- }
- for (i = 0; i < pi->num_progs; i++) {
- child = &(pi->progs[i]);
- /* pipes are inserted between pairs of commands */
- if ((i + 1) < pi->num_progs) {
- if (pipe(pipefds) < 0)
- bb_perror_msg_and_die("pipe");
- nextout = pipefds[1];
- } else {
- nextout = 1;
- pipefds[0] = -1;
- }
- /* XXX test for failed fork()? */
- #if BB_MMU
- child->pid = fork();
- #else
- child->pid = vfork();
- #endif
- if (!child->pid) {
- /* Set the handling for job control signals back to the default. */
- signal(SIGINT, SIG_DFL);
- signal(SIGQUIT, SIG_DFL);
- signal(SIGTERM, SIG_DFL);
- signal(SIGTSTP, SIG_DFL);
- signal(SIGTTIN, SIG_DFL);
- signal(SIGTTOU, SIG_DFL);
- signal(SIGCHLD, SIG_DFL);
- close_all();
- if (nextin != 0) {
- dup2(nextin, 0);
- close(nextin);
- }
- if (nextout != 1) {
- dup2(nextout, 1);
- close(nextout);
- }
- if (pipefds[0] != -1) {
- close(pipefds[0]); /* opposite end of our output pipe */
- }
- /* Like bash, explicit redirects override pipes,
- * and the pipe fd is available for dup'ing. */
- setup_redirects(child, NULL);
- if (interactive && pi->followup != PIPE_BG) {
- /* If we (the child) win the race, put ourselves in the process
- * group whose leader is the first process in this pipe. */
- if (pi->pgrp < 0) {
- pi->pgrp = getpid();
- }
- if (setpgid(0, pi->pgrp) == 0) {
- tcsetpgrp(2, pi->pgrp);
- }
- }
- pseudo_exec(child);
- }
- /* put our child in the process group whose leader is the
- first process in this pipe */
- if (pi->pgrp < 0) {
- pi->pgrp = child->pid;
- }
- /* Don't check for errors. The child may be dead already,
- * in which case setpgid returns error code EACCES. */
- setpgid(child->pid, pi->pgrp);
- if (nextin != 0)
- close(nextin);
- if (nextout != 1)
- close(nextout);
- /* If there isn't another process, nextin is garbage
- but it doesn't matter */
- nextin = pipefds[0];
- }
- return -1;
- }
- static int run_list_real(struct pipe *pi)
- {
- char *save_name = NULL;
- char **list = NULL;
- char **save_list = NULL;
- struct pipe *rpipe;
- int flag_rep = 0;
- int save_num_progs;
- int rcode = 0, flag_skip = 1;
- int flag_restore = 0;
- int if_code = 0, next_if_code = 0; /* need double-buffer to handle elif */
- reserved_style rmode, skip_more_in_this_rmode = RES_XXXX;
- /* check syntax for "for" */
- for (rpipe = pi; rpipe; rpipe = rpipe->next) {
- if ((rpipe->r_mode == RES_IN || rpipe->r_mode == RES_FOR)
- && (rpipe->next == NULL)
- ) {
- syntax();
- return 1;
- }
- if ((rpipe->r_mode == RES_IN && rpipe->next->r_mode == RES_IN && rpipe->next->progs->argv != NULL)
- || (rpipe->r_mode == RES_FOR && rpipe->next->r_mode != RES_IN)
- ) {
- syntax();
- return 1;
- }
- }
- for (; pi; pi = (flag_restore != 0) ? rpipe : pi->next) {
- if (pi->r_mode == RES_WHILE || pi->r_mode == RES_UNTIL
- || pi->r_mode == RES_FOR
- ) {
- flag_restore = 0;
- if (!rpipe) {
- flag_rep = 0;
- rpipe = pi;
- }
- }
- rmode = pi->r_mode;
- debug_printf("rmode=%d if_code=%d next_if_code=%d skip_more=%d\n",
- rmode, if_code, next_if_code, skip_more_in_this_rmode);
- if (rmode == skip_more_in_this_rmode && flag_skip) {
- if (pi->followup == PIPE_SEQ)
- flag_skip = 0;
- continue;
- }
- flag_skip = 1;
- skip_more_in_this_rmode = RES_XXXX;
- if (rmode == RES_THEN || rmode == RES_ELSE)
- if_code = next_if_code;
- if (rmode == RES_THEN && if_code)
- continue;
- if (rmode == RES_ELSE && !if_code)
- continue;
- if (rmode == RES_ELIF && !if_code)
- break;
- if (rmode == RES_FOR && pi->num_progs) {
- if (!list) {
- /* if no variable values after "in" we skip "for" */
- if (!pi->next->progs->argv)
- continue;
- /* create list of variable values */
- list = make_list_in(pi->next->progs->argv,
- pi->progs->argv[0]);
- save_list = list;
- save_name = pi->progs->argv[0];
- pi->progs->argv[0] = NULL;
- flag_rep = 1;
- }
- if (!*list) {
- free(pi->progs->argv[0]);
- free(save_list);
- list = NULL;
- flag_rep = 0;
- pi->progs->argv[0] = save_name;
- pi->progs->glob_result.gl_pathv[0] = pi->progs->argv[0];
- continue;
- }
- /* insert new value from list for variable */
- if (pi->progs->argv[0])
- free(pi->progs->argv[0]);
- pi->progs->argv[0] = *list++;
- pi->progs->glob_result.gl_pathv[0] = pi->progs->argv[0];
- }
- if (rmode == RES_IN)
- continue;
- if (rmode == RES_DO) {
- if (!flag_rep)
- continue;
- }
- if (rmode == RES_DONE) {
- if (flag_rep) {
- flag_restore = 1;
- } else {
- rpipe = NULL;
- }
- }
- if (pi->num_progs == 0)
- continue;
- save_num_progs = pi->num_progs; /* save number of programs */
- rcode = run_pipe_real(pi);
- debug_printf("run_pipe_real returned %d\n", rcode);
- if (rcode != -1) {
- /* We only ran a builtin: rcode was set by the return value
- * of run_pipe_real(), and we don't need to wait for anything. */
- } else if (pi->followup == PIPE_BG) {
- /* XXX check bash's behavior with nontrivial pipes */
- /* XXX compute jobid */
- /* XXX what does bash do with attempts to background builtins? */
- insert_bg_job(pi);
- rcode = EXIT_SUCCESS;
- } else {
- if (interactive) {
- /* move the new process group into the foreground */
- if (tcsetpgrp(shell_terminal, pi->pgrp) && errno != ENOTTY)
- bb_perror_msg("tcsetpgrp-3");
- rcode = checkjobs(pi);
- /* move the shell to the foreground */
- if (tcsetpgrp(shell_terminal, getpgid(0)) && errno != ENOTTY)
- bb_perror_msg("tcsetpgrp-4");
- } else {
- rcode = checkjobs(pi);
- }
- debug_printf("checkjobs returned %d\n", rcode);
- }
- last_return_code = rcode;
- pi->num_progs = save_num_progs; /* restore number of programs */
- if (rmode == RES_IF || rmode == RES_ELIF)
- next_if_code = rcode; /* can be overwritten a number of times */
- if (rmode == RES_WHILE)
- flag_rep = !last_return_code;
- if (rmode == RES_UNTIL)
- flag_rep = last_return_code;
- if ((rcode == EXIT_SUCCESS && pi->followup == PIPE_OR)
- || (rcode != EXIT_SUCCESS && pi->followup == PIPE_AND)
- ) {
- skip_more_in_this_rmode = rmode;
- }
- checkjobs(NULL);
- }
- return rcode;
- }
- /* return code is the exit status of the pipe */
- static int free_pipe(struct pipe *pi, int indent)
- {
- char **p;
- struct child_prog *child;
- struct redir_struct *r, *rnext;
- int a, i, ret_code = 0;
- if (pi->stopped_progs > 0)
- return ret_code;
- final_printf("%s run pipe: (pid %d)\n", indenter(indent), getpid());
- for (i = 0; i < pi->num_progs; i++) {
- child = &pi->progs[i];
- final_printf("%s command %d:\n", indenter(indent), i);
- if (child->argv) {
- for (a = 0, p = child->argv; *p; a++, p++) {
- final_printf("%s argv[%d] = %s\n", indenter(indent), a, *p);
- }
- globfree(&child->glob_result);
- child->argv = NULL;
- } else if (child->group) {
- final_printf("%s begin group (subshell:%d)\n", indenter(indent), child->subshell);
- ret_code = free_pipe_list(child->group, indent+3);
- final_printf("%s end group\n", indenter(indent));
- } else {
- final_printf("%s (nil)\n", indenter(indent));
- }
- for (r = child->redirects; r; r = rnext) {
- final_printf("%s redirect %d%s", indenter(indent), r->fd, redir_table[r->type].descrip);
- if (r->dup == -1) {
- /* guard against the case >$FOO, where foo is unset or blank */
- if (r->word.gl_pathv) {
- final_printf(" %s\n", *r->word.gl_pathv);
- globfree(&r->word);
- }
- } else {
- final_printf("&%d\n", r->dup);
- }
- rnext = r->next;
- free(r);
- }
- child->redirects = NULL;
- }
- free(pi->progs); /* children are an array, they get freed all at once */
- pi->progs = NULL;
- return ret_code;
- }
- static int free_pipe_list(struct pipe *head, int indent)
- {
- int rcode = 0; /* if list has no members */
- struct pipe *pi, *next;
- for (pi = head; pi; pi = next) {
- final_printf("%s pipe reserved mode %d\n", indenter(indent), pi->r_mode);
- rcode = free_pipe(pi, indent);
- final_printf("%s pipe followup code %d\n", indenter(indent), pi->followup);
- next = pi->next;
- /*pi->next = NULL;*/
- free(pi);
- }
- return rcode;
- }
- /* Select which version we will use */
- static int run_list(struct pipe *pi)
- {
- int rcode = 0;
- if (fake_mode == 0) {
- rcode = run_list_real(pi);
- }
- /* free_pipe_list has the side effect of clearing memory
- * In the long run that function can be merged with run_list_real,
- * but doing that now would hobble the debugging effort. */
- free_pipe_list(pi,0);
- return rcode;
- }
- /* The API for glob is arguably broken. This routine pushes a non-matching
- * string into the output structure, removing non-backslashed backslashes.
- * If someone can prove me wrong, by performing this function within the
- * original glob(3) api, feel free to rewrite this routine into oblivion.
- * Return code (0 vs. GLOB_NOSPACE) matches glob(3).
- * XXX broken if the last character is '\\', check that before calling.
- */
- static int globhack(const char *src, int flags, glob_t *pglob)
- {
- int cnt = 0, pathc;
- const char *s;
- char *dest;
- for (cnt = 1, s = src; s && *s; s++) {
- if (*s == '\\') s++;
- cnt++;
- }
- dest = malloc(cnt);
- if (!dest)
- return GLOB_NOSPACE;
- if (!(flags & GLOB_APPEND)) {
- pglob->gl_pathv = NULL;
- pglob->gl_pathc = 0;
- pglob->gl_offs = 0;
- pglob->gl_offs = 0;
- }
- pathc = ++pglob->gl_pathc;
- pglob->gl_pathv = realloc(pglob->gl_pathv, (pathc+1)*sizeof(*pglob->gl_pathv));
- if (pglob->gl_pathv == NULL)
- return GLOB_NOSPACE;
- pglob->gl_pathv[pathc-1] = dest;
- pglob->gl_pathv[pathc] = NULL;
- for (s = src; s && *s; s++, dest++) {
- if (*s == '\\') s++;
- *dest = *s;
- }
- *dest = '\0';
- return 0;
- }
- /* XXX broken if the last character is '\\', check that before calling */
- static int glob_needed(const char *s)
- {
- for (; *s; s++) {
- if (*s == '\\') s++;
- if (strchr("*[?", *s)) return 1;
- }
- return 0;
- }
- static int xglob(o_string *dest, int flags, glob_t *pglob)
- {
- int gr;
- /* short-circuit for null word */
- /* we can code this better when the debug_printf's are gone */
- if (dest->length == 0) {
- if (dest->nonnull) {
- /* bash man page calls this an "explicit" null */
- gr = globhack(dest->data, flags, pglob);
- debug_printf("globhack returned %d\n", gr);
- } else {
- return 0;
- }
- } else if (glob_needed(dest->data)) {
- gr = glob(dest->data, flags, NULL, pglob);
- debug_printf("glob returned %d\n", gr);
- if (gr == GLOB_NOMATCH) {
- /* quote removal, or more accurately, backslash removal */
- gr = globhack(dest->data, flags, pglob);
- debug_printf("globhack returned %d\n", gr);
- }
- } else {
- gr = globhack(dest->data, flags, pglob);
- debug_printf("globhack returned %d\n", gr);
- }
- if (gr == GLOB_NOSPACE)
- bb_error_msg_and_die("out of memory during glob");
- if (gr != 0) { /* GLOB_ABORTED ? */
- bb_error_msg("glob(3) error %d", gr);
- }
- /* globprint(glob_target); */
- return gr;
- }
- /* This is used to get/check local shell variables */
- static const char *get_local_var(const char *s)
- {
- struct variables *cur;
- if (!s)
- return NULL;
- for (cur = top_vars; cur; cur = cur->next)
- if (strcmp(cur->name, s) == 0)
- return cur->value;
- return NULL;
- }
- /* This is used to set local shell variables
- flg_export == 0 if only local (not exporting) variable
- flg_export == 1 if "new" exporting environ
- flg_export > 1 if current startup environ (not call putenv()) */
- static int set_local_var(const char *s, int flg_export)
- {
- char *name, *value;
- int result = 0;
- struct variables *cur;
- name = strdup(s);
- /* Assume when we enter this function that we are already in
- * NAME=VALUE format. So the first order of business is to
- * split 's' on the '=' into 'name' and 'value' */
- value = strchr(name, '=');
- /*if (value == 0 && ++value == 0) ??? -vda */
- if (value == NULL || value[1] == '\0') {
- free(name);
- return -1;
- }
- *value++ = '\0';
- for (cur = top_vars; cur; cur = cur->next) {
- if (strcmp(cur->name, name) == 0)
- break;
- }
- if (cur) {
- if (strcmp(cur->value, value) == 0) {
- if (flg_export > 0 && cur->flg_export == 0)
- cur->flg_export = flg_export;
- else
- result++;
- } else if (cur->flg_read_only) {
- bb_error_msg("%s: readonly variable", name);
- result = -1;
- } else {
- if (flg_export > 0 || cur->flg_export > 1)
- cur->flg_export = 1;
- free((char*)cur->value);
- cur->value = strdup(value);
- }
- } else {
- cur = malloc(sizeof(struct variables));
- if (!cur) {
- result = -1;
- } else {
- cur->name = strdup(name);
- if (cur->name) {
- free(cur);
- result = -1;
- } else {
- struct variables *bottom = top_vars;
- cur->value = strdup(value);
- cur->next = 0;
- cur->flg_export = flg_export;
- cur->flg_read_only = 0;
- while (bottom->next)
- bottom = bottom->next;
- bottom->next = cur;
- }
- }
- }
- if (result == 0 && cur->flg_export == 1) {
- *(value-1) = '=';
- result = putenv(name);
- } else {
- free(name);
- if (result > 0) /* equivalent to previous set */
- result = 0;
- }
- return result;
- }
- static void unset_local_var(const char *name)
- {
- struct variables *cur, *next;
- if (!name)
- return;
- for (cur = top_vars; cur; cur = cur->next) {
- if (strcmp(cur->name, name) == 0) {
- if (cur->flg_read_only) {
- bb_error_msg("%s: readonly variable", name);
- return;
- }
- if (cur->flg_export)
- unsetenv(cur->name);
- free((char*)cur->name);
- free((char*)cur->value);
- next = top_vars;
- while (next->next != cur)
- next = next->next;
- next->next = cur->next;
- free(cur);
- return;
- }
- }
- }
- static int is_assignment(const char *s)
- {
- if (!s || !isalpha(*s))
- return 0;
- s++;
- while (isalnum(*s) || *s == '_')
- s++;
- return *s == '=';
- }
- /* the src parameter allows us to peek forward to a possible &n syntax
- * for file descriptor duplication, e.g., "2>&1".
- * Return code is 0 normally, 1 if a syntax error is detected in src.
- * Resource errors (in xmalloc) cause the process to exit */
- static int setup_redirect(struct p_context *ctx, int fd, redir_type style,
- struct in_str *input)
- {
- struct child_prog *child = ctx->child;
- struct redir_struct *redir = child->redirects;
- struct redir_struct *last_redir = NULL;
- /* Create a new redir_struct and drop it onto the end of the linked list */
- while (redir) {
- last_redir = redir;
- redir = redir->next;
- }
- redir = xmalloc(sizeof(struct redir_struct));
- redir->next = NULL;
- redir->word.gl_pathv = NULL;
- if (last_redir) {
- last_redir->next = redir;
- } else {
- child->redirects = redir;
- }
- redir->type = style;
- redir->fd = (fd == -1) ? redir_table[style].default_fd : fd;
- debug_printf("Redirect type %d%s\n", redir->fd, redir_table[style].descrip);
- /* Check for a '2>&1' type redirect */
- redir->dup = redirect_dup_num(input);
- if (redir->dup == -2) return 1; /* syntax error */
- if (redir->dup != -1) {
- /* Erik had a check here that the file descriptor in question
- * is legit; I postpone that to "run time"
- * A "-" representation of "close me" shows up as a -3 here */
- debug_printf("Duplicating redirect '%d>&%d'\n", redir->fd, redir->dup);
- } else {
- /* We do _not_ try to open the file that src points to,
- * since we need to return and let src be expanded first.
- * Set ctx->pending_redirect, so we know what to do at the
- * end of the next parsed word.
- */
- ctx->pending_redirect = redir;
- }
- return 0;
- }
- static struct pipe *new_pipe(void)
- {
- struct pipe *pi;
- pi = xmalloc(sizeof(struct pipe));
- pi->num_progs = 0;
- pi->progs = NULL;
- pi->next = NULL;
- pi->followup = 0; /* invalid */
- pi->r_mode = RES_NONE;
- return pi;
- }
- static void initialize_context(struct p_context *ctx)
- {
- ctx->pipe = NULL;
- ctx->pending_redirect = NULL;
- ctx->child = NULL;
- ctx->list_head = new_pipe();
- ctx->pipe = ctx->list_head;
- ctx->w = RES_NONE;
- ctx->stack = NULL;
- ctx->old_flag = 0;
- done_command(ctx); /* creates the memory for working child */
- }
- /* normal return is 0
- * if a reserved word is found, and processed, return 1
- * should handle if, then, elif, else, fi, for, while, until, do, done.
- * case, function, and select are obnoxious, save those for later.
- */
- static int reserved_word(o_string *dest, struct p_context *ctx)
- {
- struct reserved_combo {
- char literal[7];
- unsigned char code;
- int flag;
- };
- /* Mostly a list of accepted follow-up reserved words.
- * FLAG_END means we are done with the sequence, and are ready
- * to turn the compound list into a command.
- * FLAG_START means the word must start a new compound list.
- */
- static const struct reserved_combo reserved_list[] = {
- { "if", RES_IF, FLAG_THEN | FLAG_START },
- { "then", RES_THEN, FLAG_ELIF | FLAG_ELSE | FLAG_FI },
- { "elif", RES_ELIF, FLAG_THEN },
- { "else", RES_ELSE, FLAG_FI },
- { "fi", RES_FI, FLAG_END },
- { "for", RES_FOR, FLAG_IN | FLAG_START },
- { "while", RES_WHILE, FLAG_DO | FLAG_START },
- { "until", RES_UNTIL, FLAG_DO | FLAG_START },
- { "in", RES_IN, FLAG_DO },
- { "do", RES_DO, FLAG_DONE },
- { "done", RES_DONE, FLAG_END }
- };
- enum { NRES = sizeof(reserved_list)/sizeof(reserved_list[0]) };
- const struct reserved_combo *r;
- for (r = reserved_list; r < reserved_list+NRES; r++) {
- if (strcmp(dest->data, r->literal) == 0) {
- debug_printf("found reserved word %s, code %d\n", r->literal, r->code);
- if (r->flag & FLAG_START) {
- struct p_context *new = xmalloc(sizeof(struct p_context));
- debug_printf("push stack\n");
- if (ctx->w == RES_IN || ctx->w == RES_FOR) {
- syntax();
- free(new);
- ctx->w = RES_SNTX;
- b_reset(dest);
- return 1;
- }
- *new = *ctx; /* physical copy */
- initialize_context(ctx);
- ctx->stack = new;
- } else if (ctx->w == RES_NONE || !(ctx->old_flag & (1 << r->code))) {
- syntax();
- ctx->w = RES_SNTX;
- b_reset(dest);
- return 1;
- }
- ctx->w = r->code;
- ctx->old_flag = r->flag;
- if (ctx->old_flag & FLAG_END) {
- struct p_context *old;
- debug_printf("pop stack\n");
- done_pipe(ctx, PIPE_SEQ);
- old = ctx->stack;
- old->child->group = ctx->list_head;
- old->child->subshell = 0;
- *ctx = *old; /* physical copy */
- free(old);
- }
- b_reset(dest);
- return 1;
- }
- }
- return 0;
- }
- /* normal return is 0.
- * Syntax or xglob errors return 1. */
- static int done_word(o_string *dest, struct p_context *ctx)
- {
- struct child_prog *child = ctx->child;
- glob_t *glob_target;
- int gr, flags = 0;
- debug_printf("done_word: %s %p\n", dest->data, child);
- if (dest->length == 0 && !dest->nonnull) {
- debug_printf(" true null, ignored\n");
- return 0;
- }
- if (ctx->pending_redirect) {
- glob_target = &ctx->pending_redirect->word;
- } else {
- if (child->group) {
- syntax();
- return 1; /* syntax error, groups and arglists don't mix */
- }
- if (!child->argv && (ctx->type & FLAG_PARSE_SEMICOLON)) {
- debug_printf("checking %s for reserved-ness\n", dest->data);
- if (reserved_word(dest, ctx))
- return (ctx->w == RES_SNTX);
- }
- glob_target = &child->glob_result;
- if (child->argv) flags |= GLOB_APPEND;
- }
- gr = xglob(dest, flags, glob_target);
- if (gr != 0) return 1;
- b_reset(dest);
- if (ctx->pending_redirect) {
- ctx->pending_redirect = NULL;
- if (glob_target->gl_pathc != 1) {
- bb_error_msg("ambiguous redirect");
- return 1;
- }
- } else {
- child->argv = glob_target->gl_pathv;
- }
- if (ctx->w == RES_FOR) {
- done_word(dest, ctx);
- done_pipe(ctx, PIPE_SEQ);
- }
- return 0;
- }
- /* The only possible error here is out of memory, in which case
- * xmalloc exits. */
- static int done_command(struct p_context *ctx)
- {
- /* The child is really already in the pipe structure, so
- * advance the pipe counter and make a new, null child.
- * Only real trickiness here is that the uncommitted
- * child structure, to which ctx->child points, is not
- * counted in pi->num_progs. */
- struct pipe *pi = ctx->pipe;
- struct child_prog *prog = ctx->child;
- if (prog && prog->group == NULL
- && prog->argv == NULL
- && prog->redirects == NULL
- ) {
- debug_printf("done_command: skipping null command\n");
- return 0;
- }
- if (prog) {
- pi->num_progs++;
- debug_printf("done_command: num_progs incremented to %d\n", pi->num_progs);
- } else {
- debug_printf("done_command: initializing\n");
- }
- pi->progs = xrealloc(pi->progs, sizeof(*pi->progs) * (pi->num_progs+1));
- prog = pi->progs + pi->num_progs;
- prog->redirects = NULL;
- prog->argv = NULL;
- prog->is_stopped = 0;
- prog->group = NULL;
- prog->glob_result.gl_pathv = NULL;
- prog->family = pi;
- prog->sp = 0;
- ctx->child = prog;
- prog->type = ctx->type;
- /* but ctx->pipe and ctx->list_head remain unchanged */
- return 0;
- }
- static int done_pipe(struct p_context *ctx, pipe_style type)
- {
- struct pipe *new_p;
- done_command(ctx); /* implicit closure of previous command */
- debug_printf("done_pipe, type %d\n", type);
- ctx->pipe->followup = type;
- ctx->pipe->r_mode = ctx->w;
- new_p = new_pipe();
- ctx->pipe->next = new_p;
- ctx->pipe = new_p;
- ctx->child = NULL;
- done_command(ctx); /* set up new pipe to accept commands */
- return 0;
- }
- /* peek ahead in the in_str to find out if we have a "&n" construct,
- * as in "2>&1", that represents duplicating a file descriptor.
- * returns either -2 (syntax error), -1 (no &), or the number found.
- */
- static int redirect_dup_num(struct in_str *input)
- {
- int ch, d = 0, ok = 0;
- ch = b_peek(input);
- if (ch != '&') return -1;
- b_getch(input); /* get the & */
- ch = b_peek(input);
- if (ch == '-') {
- b_getch(input);
- return -3; /* "-" represents "close me" */
- }
- while (isdigit(ch)) {
- d = d*10 + (ch-'0');
- ok = 1;
- b_getch(input);
- ch = b_peek(input);
- }
- if (ok) return d;
- bb_error_msg("ambiguous redirect");
- return -2;
- }
- /* If a redirect is immediately preceded by a number, that number is
- * supposed to tell which file descriptor to redirect. This routine
- * looks for such preceding numbers. In an ideal world this routine
- * needs to handle all the following classes of redirects...
- * echo 2>foo # redirects fd 2 to file "foo", nothing passed to echo
- * echo 49>foo # redirects fd 49 to file "foo", nothing passed to echo
- * echo -2>foo # redirects fd 1 to file "foo", "-2" passed to echo
- * echo 49x>foo # redirects fd 1 to file "foo", "49x" passed to echo
- * A -1 output from this program means no valid number was found, so the
- * caller should use the appropriate default for this redirection.
- */
- static int redirect_opt_num(o_string *o)
- {
- int num;
- if (o->length == 0)
- return -1;
- for (num = 0; num < o->length; num++) {
- if (!isdigit(*(o->data + num))) {
- return -1;
- }
- }
- /* reuse num (and save an int) */
- num = atoi(o->data);
- b_reset(o);
- return num;
- }
- static FILE *generate_stream_from_list(struct pipe *head)
- {
- FILE *pf;
- int pid, channel[2];
- if (pipe(channel) < 0) bb_perror_msg_and_die("pipe");
- #if BB_MMU
- pid = fork();
- #else
- pid = vfork();
- #endif
- if (pid < 0) {
- bb_perror_msg_and_die("fork");
- } else if (pid == 0) {
- close(channel[0]);
- if (channel[1] != 1) {
- dup2(channel[1], 1);
- close(channel[1]);
- }
- _exit(run_list_real(head)); /* leaks memory */
- }
- debug_printf("forked child %d\n", pid);
- close(channel[1]);
- pf = fdopen(channel[0], "r");
- debug_printf("pipe on FILE *%p\n", pf);
- return pf;
- }
- /* this version hacked for testing purposes */
- /* return code is exit status of the process that is run. */
- static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end)
- {
- int retcode;
- o_string result = NULL_O_STRING;
- struct p_context inner;
- FILE *p;
- struct in_str pipe_str;
- initialize_context(&inner);
- /* recursion to generate command */
- retcode = parse_stream(&result, &inner, input, subst_end);
- if (retcode != 0) return retcode; /* syntax error or EOF */
- done_word(&result, &inner);
- done_pipe(&inner, PIPE_SEQ);
- b_free(&result);
- p = generate_stream_from_list(inner.list_head);
- if (p == NULL) return 1;
- mark_open(fileno(p));
- setup_file_in_str(&pipe_str, p);
- /* now send results of command back into original context */
- retcode = parse_stream(dest, ctx, &pipe_str, '\0');
- /* XXX In case of a syntax error, should we try to kill the child?
- * That would be tough to do right, so just read until EOF. */
- if (retcode == 1) {
- while (b_getch(&pipe_str) != EOF)
- /* discard */;
- }
- debug_printf("done reading from pipe, pclose()ing\n");
- /* This is the step that wait()s for the child. Should be pretty
- * safe, since we just read an EOF from its stdout. We could try
- * to better, by using wait(), and keeping track of background jobs
- * at the same time. That would be a lot of work, and contrary
- * to the KISS philosophy of this program. */
- mark_closed(fileno(p));
- retcode = pclose(p);
- free_pipe_list(inner.list_head, 0);
- debug_printf("pclosed, retcode=%d\n", retcode);
- /* XXX this process fails to trim a single trailing newline */
- return retcode;
- }
- static int parse_group(o_string *dest, struct p_context *ctx,
- struct in_str *input, int ch)
- {
- int rcode, endch = 0;
- struct p_context sub;
- struct child_prog *child = ctx->child;
- if (child->argv) {
- syntax();
- return 1; /* syntax error, groups and arglists don't mix */
- }
- initialize_context(&sub);
- switch (ch) {
- case '(':
- endch = ')';
- child->subshell = 1;
- break;
- case '{':
- endch = '}';
- break;
- default:
- syntax(); /* really logic error */
- }
- rcode = parse_stream(dest, &sub, input, endch);
- done_word(dest, &sub); /* finish off the final word in the subcontext */
- done_pipe(&sub, PIPE_SEQ); /* and the final command there, too */
- child->group = sub.list_head;
- return rcode;
- /* child remains "open", available for possible redirects */
- }
- /* basically useful version until someone wants to get fancier,
- * see the bash man page under "Parameter Expansion" */
- static const char *lookup_param(const char *src)
- {
- const char *p = NULL;
- if (src) {
- p = getenv(src);
- if (!p)
- p = get_local_var(src);
- }
- return p;
- }
- /* return code: 0 for OK, 1 for syntax error */
- static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input)
- {
- int i, advance = 0;
- char sep[] = " ";
- int ch = input->peek(input); /* first character after the $ */
- debug_printf("handle_dollar: ch=%c\n", ch);
- if (isalpha(ch)) {
- b_addchr(dest, SPECIAL_VAR_SYMBOL);
- ctx->child->sp++;
- while (ch = b_peek(input), isalnum(ch) || ch == '_') {
- b_getch(input);
- b_addchr(dest, ch);
- }
- b_addchr(dest, SPECIAL_VAR_SYMBOL);
- } else if (isdigit(ch)) {
- i = ch - '0'; /* XXX is $0 special? */
- if (i < global_argc) {
- parse_string(dest, ctx, global_argv[i]); /* recursion */
- }
- advance = 1;
- } else switch (ch) {
- case '$':
- b_adduint(dest, getpid());
- advance = 1;
- break;
- case '!':
- if (last_bg_pid > 0) b_adduint(dest, last_bg_pid);
- advance = 1;
- break;
- case '?':
- b_adduint(dest, last_return_code);
- advance = 1;
- break;
- case '#':
- b_adduint(dest, global_argc ? global_argc-1 : 0);
- advance = 1;
- break;
- case '{':
- b_addchr(dest, SPECIAL_VAR_SYMBOL);
- ctx->child->sp++;
- b_getch(input);
- /* XXX maybe someone will try to escape the '}' */
- while (1) {
- ch = b_getch(input);
- if (ch == EOF || ch == '}')
- break;
- b_addchr(dest, ch);
- }
- if (ch != '}') {
- syntax();
- return 1;
- }
- b_addchr(dest, SPECIAL_VAR_SYMBOL);
- break;
- case '(':
- b_getch(input);
- process_command_subs(dest, ctx, input, ')');
- break;
- case '*':
- sep[0] = ifs[0];
- for (i = 1; i < global_argc; i++) {
- parse_string(dest, ctx, global_argv[i]);
- if (i+1 < global_argc)
- parse_string(dest, ctx, sep);
- }
- break;
- case '@':
- case '-':
- case '_':
- /* still unhandled, but should be eventually */
- bb_error_msg("unhandled syntax: $%c", ch);
- return 1;
- break;
- default:
- b_addqchr(dest,'$', dest->quote);
- }
- /* Eat the character if the flag was set. If the compiler
- * is smart enough, we could substitute "b_getch(input);"
- * for all the "advance = 1;" above, and also end up with
- * a nice size-optimized program. Hah! That'll be the day.
- */
- if (advance) b_getch(input);
- return 0;
- }
- static int parse_string(o_string *dest, struct p_context *ctx, const char *src)
- {
- struct in_str foo;
- setup_string_in_str(&foo, src);
- return parse_stream(dest, ctx, &foo, '\0');
- }
- /* return code is 0 for normal exit, 1 for syntax error */
- static int parse_stream(o_string *dest, struct p_context *ctx,
- struct in_str *input, int end_trigger)
- {
- int ch, m;
- int redir_fd;
- redir_type redir_style;
- int next;
- /* Only double-quote state is handled in the state variable dest->quote.
- * A single-quote triggers a bypass of the main loop until its mate is
- * found. When recursing, quote state is passed in via dest->quote. */
- debug_printf("parse_stream, end_trigger=%d\n", end_trigger);
- while ((ch = b_getch(input)) != EOF) {
- m = map[ch];
- next = (ch == '\n') ? 0 : b_peek(input);
- debug_printf("parse_stream: ch=%c (%d) m=%d quote=%d\n",
- ch, ch, m, dest->quote);
- if (m == 0 || ((m == 1 || m == 2) && dest->quote)) {
- b_addqchr(dest, ch, dest->quote);
- continue;
- }
- if (m == 2) { /* unquoted IFS */
- if (done_word(dest, ctx)) {
- return 1;
- }
- /* If we aren't performing a substitution, treat a newline as a
- * command separator. */
- if (end_trigger != '\0' && ch == '\n')
- done_pipe(ctx, PIPE_SEQ);
- }
- if (ch == end_trigger && !dest->quote && ctx->w == RES_NONE) {
- debug_printf("leaving parse_stream (triggered)\n");
- return 0;
- }
- if (m == 2)
- continue;
- switch (ch) {
- case '#':
- if (dest->length == 0 && !dest->quote) {
- while (1) {
- ch = b_peek(input);
- if (ch == EOF || ch == '\n')
- break;
- b_getch(input);
- }
- } else {
- b_addqchr(dest, ch, dest->quote);
- }
- break;
- case '\\':
- if (next == EOF) {
- syntax();
- return 1;
- }
- b_addqchr(dest, '\\', dest->quote);
- b_addqchr(dest, b_getch(input), dest->quote);
- break;
- case '$':
- if (handle_dollar(dest, ctx, input) != 0) return 1;
- break;
- case '\'':
- dest->nonnull = 1;
- while (1) {
- ch = b_getch(input);
- if (ch == EOF || ch == '\'')
- break;
- b_addchr(dest, ch);
- }
- if (ch == EOF) {
- syntax();
- return 1;
- }
- break;
- case '"':
- dest->nonnull = 1;
- dest->quote = !dest->quote;
- break;
- case '`':
- process_command_subs(dest, ctx, input, '`');
- break;
- case '>':
- redir_fd = redirect_opt_num(dest);
- done_word(dest, ctx);
- redir_style = REDIRECT_OVERWRITE;
- if (next == '>') {
- redir_style = REDIRECT_APPEND;
- b_getch(input);
- } else if (next == '(') {
- syntax(); /* until we support >(list) Process Substitution */
- return 1;
- }
- setup_redirect(ctx, redir_fd, redir_style, input);
- break;
- case '<':
- redir_fd = redirect_opt_num(dest);
- done_word(dest, ctx);
- redir_style = REDIRECT_INPUT;
- if (next == '<') {
- redir_style = REDIRECT_HEREIS;
- b_getch(input);
- } else if (next == '>') {
- redir_style = REDIRECT_IO;
- b_getch(input);
- } else if (next == '(') {
- syntax(); /* until we support <(list) Process Substitution */
- return 1;
- }
- setup_redirect(ctx, redir_fd, redir_style, input);
- break;
- case ';':
- done_word(dest, ctx);
- done_pipe(ctx, PIPE_SEQ);
- break;
- case '&':
- done_word(dest, ctx);
- if (next == '&') {
- b_getch(input);
- done_pipe(ctx, PIPE_AND);
- } else {
- done_pipe(ctx, PIPE_BG);
- }
- break;
- case '|':
- done_word(dest, ctx);
- if (next == '|') {
- b_getch(input);
- done_pipe(ctx, PIPE_OR);
- } else {
- /* we could pick up a file descriptor choice here
- * with redirect_opt_num(), but bash doesn't do it.
- * "echo foo 2| cat" yields "foo 2". */
- done_command(ctx);
- }
- break;
- case '(':
- case '{':
- if (parse_group(dest, ctx, input, ch) != 0)
- return 1;
- break;
- case ')':
- case '}':
- syntax(); /* Proper use of this character caught by end_trigger */
- return 1;
- default:
- syntax(); /* this is really an internal logic error */
- return 1;
- }
- }
- /* complain if quote? No, maybe we just finished a command substitution
- * that was quoted. Example:
- * $ echo "`cat foo` plus more"
- * and we just got the EOF generated by the subshell that ran "cat foo"
- * The only real complaint is if we got an EOF when end_trigger != '\0',
- * that is, we were really supposed to get end_trigger, and never got
- * one before the EOF. Can't use the standard "syntax error" return code,
- * so that parse_stream_outer can distinguish the EOF and exit smoothly. */
- debug_printf("leaving parse_stream (EOF)\n");
- if (end_trigger != '\0')
- return -1;
- return 0;
- }
- static void mapset(const char *set, int code)
- {
- while (*set)
- map[(unsigned char)*set++] = code;
- }
- static void update_ifs_map(void)
- {
- /* char *ifs and char map[256] are both globals. */
- ifs = getenv("IFS");
- if (ifs == NULL) ifs = " \t\n";
- /* Precompute a list of 'flow through' behavior so it can be treated
- * quickly up front. Computation is necessary because of IFS.
- * Special case handling of IFS == " \t\n" is not implemented.
- * The map[] array only really needs two bits each, and on most machines
- * that would be faster because of the reduced L1 cache footprint.
- */
- memset(map, 0, sizeof(map)); /* most characters flow through always */
- mapset("\\$'\"`", 3); /* never flow through */
- mapset("<>;&|(){}#", 1); /* flow through if quoted */
- mapset(ifs, 2); /* also flow through if quoted */
- }
- /* most recursion does not come through here, the exception is
- * from builtin_source() */
- static int parse_stream_outer(struct in_str *inp, int flag)
- {
- struct p_context ctx;
- o_string temp = NULL_O_STRING;
- int rcode;
- do {
- ctx.type = flag;
- initialize_context(&ctx);
- update_ifs_map();
- if (!(flag & FLAG_PARSE_SEMICOLON) || (flag & FLAG_REPARSING)) mapset(";$&|", 0);
- inp->promptmode = 1;
- rcode = parse_stream(&temp, &ctx, inp, '\n');
- if (rcode != 1 && ctx.old_flag != 0) {
- syntax();
- }
- if (rcode != 1 && ctx.old_flag == 0) {
- done_word(&temp, &ctx);
- done_pipe(&ctx, PIPE_SEQ);
- run_list(ctx.list_head);
- } else {
- if (ctx.old_flag != 0) {
- free(ctx.stack);
- b_reset(&temp);
- }
- temp.nonnull = 0;
- temp.quote = 0;
- inp->p = NULL;
- free_pipe_list(ctx.list_head,0);
- }
- b_free(&temp);
- } while (rcode != -1 && !(flag & FLAG_EXIT_FROM_LOOP)); /* loop on syntax errors, return on EOF */
- return 0;
- }
- static int parse_string_outer(const char *s, int flag)
- {
- struct in_str input;
- setup_string_in_str(&input, s);
- return parse_stream_outer(&input, flag);
- }
- static int parse_file_outer(FILE *f)
- {
- int rcode;
- struct in_str input;
- setup_file_in_str(&input, f);
- rcode = parse_stream_outer(&input, FLAG_PARSE_SEMICOLON);
- return rcode;
- }
- /* Make sure we have a controlling tty. If we get started under a job
- * aware app (like bash for example), make sure we are now in charge so
- * we don't fight over who gets the foreground */
- static void setup_job_control(void)
- {
- /*static --why?? */ pid_t shell_pgrp;
- /* Loop until we are in the foreground. */
- while (tcgetpgrp(shell_terminal) != (shell_pgrp = getpgrp()))
- kill(- shell_pgrp, SIGTTIN);
- /* Ignore interactive and job-control signals. */
- signal(SIGINT, SIG_IGN);
- signal(SIGQUIT, SIG_IGN);
- signal(SIGTERM, SIG_IGN);
- signal(SIGTSTP, SIG_IGN);
- signal(SIGTTIN, SIG_IGN);
- signal(SIGTTOU, SIG_IGN);
- signal(SIGCHLD, SIG_IGN);
- /* Put ourselves in our own process group. */
- setsid();
- shell_pgrp = getpid();
- setpgid(shell_pgrp, shell_pgrp);
- /* Grab control of the terminal. */
- tcsetpgrp(shell_terminal, shell_pgrp);
- }
- int hush_main(int argc, char **argv);
- int hush_main(int argc, char **argv)
- {
- int opt;
- FILE *input;
- char **e;
- #if ENABLE_FEATURE_EDITING
- line_input_state = new_line_input_t(FOR_SHELL);
- #endif
- /* XXX what should these be while sourcing /etc/profile? */
- global_argc = argc;
- global_argv = argv;
- /* (re?) initialize globals. Sometimes hush_main() ends up calling
- * hush_main(), therefore we cannot rely on the BSS to zero out this
- * stuff. Reset these to 0 every time. */
- ifs = NULL;
- /* map[] is taken care of with call to update_ifs_map() */
- fake_mode = 0;
- interactive = 0;
- close_me_head = NULL;
- last_bg_pid = 0;
- job_list = NULL;
- last_jobid = 0;
- /* Initialize some more globals to non-zero values */
- set_cwd();
- if (ENABLE_FEATURE_EDITING)
- cmdedit_set_initial_prompt();
- else PS1 = NULL;
- PS2 = "> ";
- /* initialize our shell local variables with the values
- * currently living in the environment */
- e = environ;
- if (e)
- while (*e)
- set_local_var(*e++, 2); /* without call putenv() */
- last_return_code = EXIT_SUCCESS;
- if (argv[0] && argv[0][0] == '-') {
- debug_printf("\nsourcing /etc/profile\n");
- input = fopen("/etc/profile", "r");
- if (input != NULL) {
- mark_open(fileno(input));
- parse_file_outer(input);
- mark_closed(fileno(input));
- fclose(input);
- }
- }
- input = stdin;
- while ((opt = getopt(argc, argv, "c:xif")) > 0) {
- switch (opt) {
- case 'c':
- global_argv = argv + optind;
- global_argc = argc - optind;
- opt = parse_string_outer(optarg, FLAG_PARSE_SEMICOLON);
- goto final_return;
- case 'i':
- interactive++;
- break;
- case 'f':
- fake_mode++;
- break;
- default:
- #ifndef BB_VER
- fprintf(stderr, "Usage: sh [FILE]...\n"
- " or: sh -c command [args]...\n\n");
- exit(EXIT_FAILURE);
- #else
- bb_show_usage();
- #endif
- }
- }
- /* A shell is interactive if the '-i' flag was given, or if all of
- * the following conditions are met:
- * no -c command
- * no arguments remaining or the -s flag given
- * standard input is a terminal
- * standard output is a terminal
- * Refer to Posix.2, the description of the 'sh' utility. */
- if (argv[optind] == NULL && input == stdin
- && isatty(STDIN_FILENO) && isatty(STDOUT_FILENO)
- ) {
- interactive++;
- }
- debug_printf("\ninteractive=%d\n", interactive);
- if (interactive) {
- /* Looks like they want an interactive shell */
- #if !ENABLE_FEATURE_SH_EXTRA_QUIET
- printf( "\n\n%s hush - the humble shell v0.01 (testing)\n",
- BB_BANNER);
- printf( "Enter 'help' for a list of built-in commands.\n\n");
- #endif
- setup_job_control();
- }
- if (argv[optind] == NULL) {
- opt = parse_file_outer(stdin);
- goto final_return;
- }
- debug_printf("\nrunning script '%s'\n", argv[optind]);
- global_argv = argv + optind;
- global_argc = argc - optind;
- input = xfopen(argv[optind], "r");
- opt = parse_file_outer(input);
- #if ENABLE_FEATURE_CLEAN_UP
- fclose(input);
- if (cwd != bb_msg_unknown)
- free((char*)cwd);
- {
- struct variables *cur, *tmp;
- for (cur = top_vars; cur; cur = tmp) {
- tmp = cur->next;
- if (!cur->flg_read_only) {
- free((char*)cur->name);
- free((char*)cur->value);
- free(cur);
- }
- }
- }
- #endif
- final_return:
- return opt ? opt : last_return_code;
- }
- static char *insert_var_value(char *inp)
- {
- int res_str_len = 0;
- int len;
- int done = 0;
- char *p, *res_str = NULL;
- const char *p1;
- while ((p = strchr(inp, SPECIAL_VAR_SYMBOL))) {
- if (p != inp) {
- len = p - inp;
- res_str = xrealloc(res_str, (res_str_len + len));
- strncpy((res_str + res_str_len), inp, len);
- res_str_len += len;
- }
- inp = ++p;
- p = strchr(inp, SPECIAL_VAR_SYMBOL);
- *p = '\0';
- p1 = lookup_param(inp);
- if (p1) {
- len = res_str_len + strlen(p1);
- res_str = xrealloc(res_str, (1 + len));
- strcpy((res_str + res_str_len), p1);
- res_str_len = len;
- }
- *p = SPECIAL_VAR_SYMBOL;
- inp = ++p;
- done = 1;
- }
- if (done) {
- res_str = xrealloc(res_str, (1 + res_str_len + strlen(inp)));
- strcpy((res_str + res_str_len), inp);
- while ((p = strchr(res_str, '\n'))) {
- *p = ' ';
- }
- }
- return (res_str == NULL) ? inp : res_str;
- }
- static char **make_list_in(char **inp, char *name)
- {
- int len, i;
- int name_len = strlen(name);
- int n = 0;
- char **list;
- char *p1, *p2, *p3;
- /* create list of variable values */
- list = xmalloc(sizeof(*list));
- for (i = 0; inp[i]; i++) {
- p3 = insert_var_value(inp[i]);
- p1 = p3;
- while (*p1) {
- if ((*p1 == ' ')) {
- p1++;
- continue;
- }
- p2 = strchr(p1, ' ');
- if (p2) {
- len = p2 - p1;
- } else {
- len = strlen(p1);
- p2 = p1 + len;
- }
- /* we use n + 2 in realloc for list, because we add
- * new element and then we will add NULL element */
- list = xrealloc(list, sizeof(*list) * (n + 2));
- list[n] = xmalloc(2 + name_len + len);
- strcpy(list[n], name);
- strcat(list[n], "=");
- strncat(list[n], p1, len);
- list[n++][name_len + len + 1] = '\0';
- p1 = p2;
- }
- if (p3 != inp[i]) free(p3);
- }
- list[n] = NULL;
- return list;
- }
- /* Make new string for parser */
- static char* make_string(char ** inp)
- {
- char *p;
- char *str = NULL;
- int n;
- int len = 2;
- for (n = 0; inp[n]; n++) {
- p = insert_var_value(inp[n]);
- str = xrealloc(str, (len + strlen(p)));
- if (n) {
- strcat(str, " ");
- } else {
- *str = '\0';
- }
- strcat(str, p);
- len = strlen(str) + 3;
- if (p != inp[n]) free(p);
- }
- len = strlen(str);
- str[len] = '\n';
- str[len+1] = '\0';
- return str;
- }
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