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- /*
- * libuci - Library for the Unified Configuration Interface
- * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
- *
- * this program is free software; you can redistribute it and/or modify
- * it under the terms of the gnu lesser general public license version 2.1
- * as published by the free software foundation
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- */
- /*
- * This file contains the code for parsing uci config files
- */
- #include <sys/types.h>
- #include <sys/stat.h>
- #include <stdbool.h>
- #include <stdio.h>
- #include <ctype.h>
- #define LINEBUF 128
- #define LINEBUF_MAX 4096
- /*
- * Fetch a new line from the input stream and resize buffer if necessary
- */
- static void uci_getln(struct uci_context *ctx)
- {
- struct uci_parse_context *pctx = ctx->pctx;
- char *p;
- int ofs;
- if (pctx->buf == NULL) {
- pctx->buf = uci_malloc(ctx, LINEBUF);
- pctx->bufsz = LINEBUF;
- }
- ofs = 0;
- do {
- p = &pctx->buf[ofs];
- p[ofs] = 0;
- p = fgets(p, pctx->bufsz - ofs, pctx->file);
- if (!p || !p[ofs])
- return;
- ofs += strlen(p);
- if (pctx->buf[ofs - 1] == '\n') {
- pctx->line++;
- pctx->buf[ofs - 1] = 0;
- return;
- }
- if (pctx->bufsz > LINEBUF_MAX/2) {
- pctx->byte = LINEBUF_MAX;
- UCI_THROW(ctx, UCI_ERR_PARSE);
- }
- pctx->bufsz *= 2;
- pctx->buf = uci_realloc(ctx, pctx->buf, pctx->bufsz);
- } while (1);
- }
- /*
- * Clean up all extra memory used by the parser
- */
- static void uci_parse_cleanup(struct uci_context *ctx)
- {
- struct uci_parse_context *pctx;
- pctx = ctx->pctx;
- if (!pctx)
- return;
- if (pctx->cfg) {
- uci_list_del(&pctx->cfg->list);
- uci_drop_file(pctx->cfg);
- }
- if (pctx->buf)
- free(pctx->buf);
- if (pctx->file)
- fclose(pctx->file);
- free(pctx);
- }
- /*
- * move the string pointer forward until a non-whitespace character or
- * EOL is reached
- */
- static void skip_whitespace(char **str)
- {
- while (**str && isspace(**str))
- *str += 1;
- }
- static inline void addc(char **dest, char **src)
- {
- **dest = **src;
- *dest += 1;
- *src += 1;
- }
- static inline void parse_backslash(char **str, char **target)
- {
- /* skip backslash */
- *str += 1;
- /* FIXME: decode escaped characters? */
- addc(target, str);
- }
- /*
- * parse a double quoted string argument from the command line
- */
- static void parse_double_quote(struct uci_context *ctx, char **str, char **target)
- {
- char c;
- /* skip quote character */
- *str += 1;
- while ((c = **str)) {
- switch(c) {
- case '\\':
- parse_backslash(str, target);
- continue;
- case '"':
- **target = 0;
- *str += 1;
- return;
- default:
- addc(target, str);
- break;
- }
- }
- ctx->pctx->byte = *str - ctx->pctx->buf;
- UCI_THROW(ctx, UCI_ERR_PARSE);
- }
- /*
- * parse a single quoted string argument from the command line
- */
- static void parse_single_quote(struct uci_context *ctx, char **str, char **target)
- {
- char c;
- /* skip quote character */
- *str += 1;
- while ((c = **str)) {
- switch(c) {
- case '\'':
- **target = 0;
- *str += 1;
- return;
- default:
- addc(target, str);
- }
- }
- ctx->pctx->byte = *str - ctx->pctx->buf;
- UCI_THROW(ctx, UCI_ERR_PARSE);
- }
- /*
- * parse a string from the command line and detect the quoting style
- */
- static void parse_str(struct uci_context *ctx, char **str, char **target)
- {
- do {
- switch(**str) {
- case '\\':
- parse_backslash(str, target);
- continue;
- case '\'':
- parse_single_quote(ctx, str, target);
- break;
- case '"':
- parse_double_quote(ctx, str, target);
- break;
- case 0:
- goto done;
- default:
- addc(target, str);
- break;
- }
- } while (**str && !isspace(**str));
- done:
- /*
- * if the string was unquoted and we've stopped at a whitespace
- * character, skip to the next one, because the whitespace will
- * be overwritten by a null byte here
- */
- if (**str)
- *str += 1;
- /* terminate the parsed string */
- **target = 0;
- }
- /*
- * extract the next argument from the command line
- */
- static char *next_arg(struct uci_context *ctx, char **str, bool required)
- {
- char *val;
- char *ptr;
- val = ptr = *str;
- skip_whitespace(str);
- parse_str(ctx, str, &ptr);
- if (required && !*val) {
- ctx->pctx->byte = *str - ctx->pctx->buf;
- UCI_THROW(ctx, UCI_ERR_PARSE);
- }
- return uci_strdup(ctx, val);
- }
- /*
- * verify that the end of the line or command is reached.
- * throw an error if extra arguments are given on the command line
- */
- static void assert_eol(struct uci_context *ctx, char **str)
- {
- char *tmp;
- tmp = next_arg(ctx, str, false);
- if (tmp && *tmp) {
- ctx->pctx->byte = tmp - ctx->pctx->buf;
- UCI_THROW(ctx, UCI_ERR_PARSE);
- }
- }
- /*
- * parse the 'config' uci command (open a section)
- */
- static void uci_parse_config(struct uci_context *ctx, char **str)
- {
- char *type, *name;
- *str += strlen(*str) + 1;
- if (!*str) {
- ctx->pctx->byte = *str - ctx->pctx->buf;
- UCI_THROW(ctx, UCI_ERR_PARSE);
- }
- type = next_arg(ctx, str, true);
- name = next_arg(ctx, str, false);
- assert_eol(ctx, str);
- }
- /*
- * parse the 'option' uci command (open a value)
- */
- static void uci_parse_option(struct uci_context *ctx, char **str)
- {
- char *name, *value;
- *str += strlen(*str) + 1;
- name = next_arg(ctx, str, true);
- value = next_arg(ctx, str, true);
- assert_eol(ctx, str);
- DPRINTF("\tOption: %s=\"%s\"\n", name, value);
- }
- /*
- * parse a complete input line, split up combined commands by ';'
- */
- static void uci_parse_line(struct uci_context *ctx)
- {
- struct uci_parse_context *pctx = ctx->pctx;
- char *word, *brk;
- for (word = strtok_r(pctx->buf, ";", &brk);
- word;
- word = strtok_r(NULL, ";", &brk)) {
- char *pbrk;
- word = strtok_r(word, " \t", &pbrk);
- switch(word[0]) {
- case 'c':
- if ((word[1] == 0) || !strcmp(word + 1, "onfig"))
- uci_parse_config(ctx, &word);
- break;
- case 'o':
- if ((word[1] == 0) || !strcmp(word + 1, "ption"))
- uci_parse_option(ctx, &word);
- break;
- default:
- pctx->byte = word - pctx->buf;
- UCI_THROW(ctx, UCI_ERR_PARSE);
- break;
- }
- }
- }
- int uci_load(struct uci_context *ctx, const char *name)
- {
- struct uci_parse_context *pctx;
- struct stat statbuf;
- char *filename;
- bool confpath;
- UCI_HANDLE_ERR(ctx);
- UCI_ASSERT(ctx, name != NULL);
- /* make sure no memory from previous parse attempts is leaked */
- uci_parse_cleanup(ctx);
- pctx = (struct uci_parse_context *) uci_malloc(ctx, sizeof(struct uci_parse_context));
- ctx->pctx = pctx;
- switch (name[0]) {
- case '.':
- case '/':
- /* absolute/relative path outside of /etc/config */
- filename = (char *) name;
- confpath = false;
- break;
- default:
- filename = uci_malloc(ctx, strlen(name) + sizeof(UCI_CONFDIR) + 2);
- sprintf(filename, UCI_CONFDIR "/%s", name);
- confpath = true;
- break;
- }
- if ((stat(filename, &statbuf) < 0) ||
- ((statbuf.st_mode & S_IFMT) != S_IFREG))
- UCI_THROW(ctx, UCI_ERR_NOTFOUND);
- pctx->file = fopen(filename, "r");
- if (filename != name)
- free(filename);
- if (!pctx->file)
- UCI_THROW(ctx, UCI_ERR_IO);
- pctx->cfg = uci_alloc_file(ctx, name);
- while (!feof(pctx->file)) {
- uci_getln(ctx);
- if (pctx->buf[0])
- uci_parse_line(ctx);
- }
- /* add to main config file list */
- uci_list_add(&ctx->root, &pctx->cfg->list);
- pctx->cfg = NULL;
- /* no error happened, we can get rid of the parser context now */
- uci_parse_cleanup(ctx);
- return 0;
- }
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