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- /**
- * nmrpflash - Netgear Unbrick Utility
- * Copyright (C) 2016 Joseph Lehner <joseph.c.lehner@gmail.com>
- *
- * nmrpflash is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * nmrpflash 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.
- *
- * You should have received a copy of the GNU General Public License
- * along with nmrpflash. If not, see <http://www.gnu.org/licenses/>.
- *
- */
- #include <signal.h>
- #include <stdlib.h>
- #include <string.h>
- #include <unistd.h>
- #include <errno.h>
- #include <stdio.h>
- #include <time.h>
- #include "nmrpd.h"
- #define NMRP_HDR_LEN 6
- #define NMRP_OPT_HDR_LEN 4
- #define NMRP_MIN_PKT_LEN (sizeof(struct eth_hdr) + NMRP_HDR_LEN)
- #define NMRP_MAX_OPT_SIZE 12
- #define NMRP_MAX_OPT_NUM 3
- #define NMRP_OPT_NEXT(x) ((struct nmrp_opt*)(((char*)x) + x->len))
- #define ETH_P_NMRP 0x0912
- #define IP_LEN 4
- #define MAX_LOOP_RECV 1024
- #ifndef PACKED
- #define PACKED __attribute__((__packed__))
- #endif
- #ifdef NMRPFLASH_WINDOWS
- #define setenv(name, value, overwrite) SetEnvironmentVariable(name, value)
- #endif
- enum nmrp_code {
- NMRP_C_NONE = 0,
- NMRP_C_ADVERTISE = 1,
- NMRP_C_CONF_REQ = 2,
- NMRP_C_CONF_ACK = 3,
- NMRP_C_CLOSE_REQ = 4,
- NMRP_C_CLOSE_ACK = 5,
- NMRP_C_KEEP_ALIVE_REQ = 6,
- NMRP_C_KEEP_ALIVE_ACK = 7,
- NMRP_C_TFTP_UL_REQ = 16
- };
- enum nmrp_opt_type {
- NMRP_O_MAGIC_NO = 0x0001,
- NMRP_O_DEV_IP = 0x0002,
- NMRP_O_DEV_REGION = 0x0004,
- NMRP_O_FW_UP = 0x0101,
- NMRP_O_ST_UP = 0x0102,
- NMRP_O_FILE_NAME = 0x0181
- };
- struct nmrp_opt {
- uint16_t type;
- uint16_t len;
- union {
- uint8_t magic[4];
- uint16_t region;
- struct {
- uint8_t addr[4];
- uint8_t mask[4];
- } ip;
- } val;
- } PACKED;
- struct nmrp_msg {
- uint16_t reserved;
- uint8_t code;
- uint8_t id;
- uint16_t len;
- /* only opts[0] is valid! think of this as a char* */
- struct nmrp_opt opts[NMRP_MAX_OPT_NUM];
- /* this is NOT part of the transmitted packet */
- uint32_t num_opts;
- } PACKED;
- struct nmrp_pkt {
- struct eth_hdr eh;
- struct nmrp_msg msg;
- } PACKED;
- static const char *msg_code_str(uint16_t code)
- {
- #define CASE_CODE(x) case NMRP_C_ ## x: return #x
- static char buf[16];
- switch (code) {
- CASE_CODE(ADVERTISE);
- CASE_CODE(CONF_REQ);
- CASE_CODE(CONF_ACK);
- CASE_CODE(CLOSE_REQ);
- CASE_CODE(CLOSE_ACK);
- CASE_CODE(KEEP_ALIVE_REQ);
- CASE_CODE(KEEP_ALIVE_ACK);
- CASE_CODE(TFTP_UL_REQ);
- default:
- snprintf(buf, sizeof(buf), "%04x", code);
- return buf;
- }
- #undef CASE_CODE
- }
- static uint16_t to_region_code(const char *region)
- {
- #define REGION_CODE(r, c) if (!strcasecmp(region, r)) return c
- REGION_CODE("NA", 0x0001);
- REGION_CODE("WW", 0x0002);
- REGION_CODE("GR", 0x0003);
- REGION_CODE("PR", 0x0004);
- REGION_CODE("RU", 0x0005);
- REGION_CODE("BZ", 0x0006);
- REGION_CODE("IN", 0x0007);
- REGION_CODE("KO", 0x0008);
- REGION_CODE("JP", 0x0009);
- #undef REGION_CODE
- return 0;
- }
- static void msg_dump(struct nmrp_msg *msg)
- {
- int remain_len;
- fprintf(stderr, "res=0x%04x, code=0x%02x, id=0x%02x, len=%u",
- msg->reserved, msg->code, msg->id, msg->len);
- remain_len = msg->len - NMRP_HDR_LEN;
- fprintf(stderr, "%s\n", remain_len ? "" : " (no opts)");
- }
- static void msg_hton(struct nmrp_msg *msg)
- {
- uint32_t i = 0;
- struct nmrp_opt *opt = msg->opts, *next;
- msg->reserved = htons(msg->reserved);
- msg->len = htons(msg->len);
- for (; i != msg->num_opts; ++i) {
- next = NMRP_OPT_NEXT(opt);
- opt->len = htons(opt->len);
- opt->type = htons(opt->type);
- opt = next;
- }
- }
- static void msg_hdr_ntoh(struct nmrp_msg *msg)
- {
- msg->reserved = ntohs(msg->reserved);
- msg->len = ntohs(msg->len);
- }
- static int msg_ntoh(struct nmrp_msg *msg)
- {
- struct nmrp_opt *opt = msg->opts;
- int remaining;
- remaining = msg->len - NMRP_HDR_LEN;
- // FIXME maximum of two options supported, maximum option
- // size is 12
- if (remaining < NMRP_MAX_OPT_NUM * NMRP_MAX_OPT_SIZE) {
- while (remaining > 0) {
- if (remaining < NMRP_OPT_HDR_LEN) {
- break;
- }
- opt->type = ntohs(opt->type);
- opt->len = ntohs(opt->len);
- if (!opt->len || opt->len > NMRP_MAX_OPT_SIZE) {
- break;
- }
- remaining -= opt->len;
- opt = NMRP_OPT_NEXT(opt);
- }
- if (!remaining) {
- return 0;
- }
- }
- fprintf(stderr, "Unexpected message format.\n");
- msg_dump(msg);
- return 1;
- }
- static void *msg_opt_data(struct nmrp_msg *msg, uint16_t type, uint16_t *len)
- {
- static char buf[128];
- struct nmrp_opt *opt = msg->opts;
- int remaining = msg->len - NMRP_HDR_LEN;
- memset(buf, 0, sizeof(buf));
- while (remaining > 0) {
- if (opt->type == type) {
- if (opt->len == NMRP_OPT_HDR_LEN) {
- return NULL;
- }
- *len = opt->len - NMRP_OPT_HDR_LEN;
- memcpy(buf, &opt->val, MIN(*len, sizeof(buf)-1));
- return buf;
- }
- if (!opt->len) {
- break;
- }
- remaining -= opt->len;
- opt = NMRP_OPT_NEXT(opt);
- }
- return NULL;
- }
- static void msg_opt_add(struct nmrp_msg *msg, uint16_t type, void *data,
- uint16_t len)
- {
- uint32_t i = 0;
- struct nmrp_opt *opt = msg->opts;
- if (len + NMRP_OPT_HDR_LEN > NMRP_MAX_OPT_SIZE
- || msg->num_opts == NMRP_MAX_OPT_NUM) {
- fprintf(stderr, "Invalid option - this is a bug.\n");
- }
- for (; i <= msg->num_opts; ++i) {
- opt = NMRP_OPT_NEXT(opt);
- }
- opt->len = NMRP_OPT_HDR_LEN + len;
- opt->type = type;
- if (len) {
- memcpy(&opt->val, data, len);
- }
- msg->len += opt->len;
- ++msg->num_opts;
- }
- static inline void msg_init(struct nmrp_msg *msg, uint16_t code)
- {
- memset(msg, 0, sizeof(*msg));
- msg->len = NMRP_HDR_LEN;
- msg->code = code;
- }
- #ifdef NMRPFLASH_FUZZ
- #define ethsock_create(a, b) ethsock_create_fake(a, b)
- #define ethsock_get_hwaddr(a) ethsock_get_hwaddr_fake(a)
- #define ethsock_recv(a, b, c) ethsock_recv_fake(a, b, c)
- #define ethsock_send(a, b, c) (0)
- #define ethsock_set_timeout(a, b) (0)
- #define ethsock_ip_add(a, b, c, d) (0)
- #define ethsock_ip_del(a, b) (0)
- #define ethsock_close(a) (0)
- #define tftp_put(a) (0)
- static struct ethsock* ethsock_create_fake(const char *intf, uint16_t protocol)
- {
- return (struct ethsock*)1;
- }
- static uint8_t *ethsock_get_hwaddr_fake(struct ethsock* sock)
- {
- static uint8_t hwaddr[6];
- memset(hwaddr, 0xfa, 6);
- return hwaddr;
- }
- static ssize_t ethsock_recv_fake(struct ethsock *sock, void *buf, size_t len)
- {
- return read(STDIN_FILENO, buf, len);
- }
- #endif
- static int pkt_send(struct ethsock *sock, struct nmrp_pkt *pkt)
- {
- size_t len = ntohs(pkt->msg.len) + sizeof(pkt->eh);
- return ethsock_send(sock, pkt, len);
- }
- static int pkt_recv(struct ethsock *sock, struct nmrp_pkt *pkt)
- {
- ssize_t bytes, len;
- memset(pkt, 0, sizeof(*pkt));
- bytes = ethsock_recv(sock, pkt, sizeof(*pkt));
- if (bytes < 0) {
- return 1;
- } else if (!bytes) {
- return 2;
- } else if (bytes < NMRP_MIN_PKT_LEN) {
- fprintf(stderr, "Short packet (%d bytes)\n", (int)bytes);
- return 1;
- }
- msg_hdr_ntoh(&pkt->msg);
- len = pkt->msg.len + sizeof(pkt->eh);
- if (bytes < len) {
- fprintf(stderr, "Short packet (expected %d, got %d).\n",
- (int)len, (int)bytes);
- return 1;
- }
- return msg_ntoh(&pkt->msg);
- }
- static int mac_parse(const char *str, uint8_t *hwaddr)
- {
- int i;
- unsigned data[6];
- sscanf(str, "%02x:%02x:%02x:%02x:%02x:%02x%n",
- data, data + 1, data + 2, data + 3, data + 4, data + 5, &i);
- if (i == strlen(str)) {
- for (i = 0; i != 6; ++i) {
- if (data[i] > 255) {
- break;
- }
- hwaddr[i] = data[i] & 0xff;
- }
- if (i == 6) {
- return 1;
- }
- }
- return 0;
- }
- struct is_valid_ip_arg
- {
- struct in_addr *ipaddr;
- struct in_addr *ipmask;
- int result;
- };
- static int is_valid_ip_cb(struct ethsock_ip_callback_args *args)
- {
- #define SUBNET(x) ((x)->ipaddr->s_addr & (x)->ipmask->s_addr)
- struct is_valid_ip_arg *arg = args->arg;
- if (SUBNET(args) == SUBNET(arg)) {
- arg->result = args->ipaddr->s_addr != arg->ipaddr->s_addr;
- return 0;
- }
- return 1;
- #undef SUBNET
- }
- static int is_valid_ip(struct ethsock *sock, struct in_addr *ipaddr,
- struct in_addr *ipmask)
- {
- int status;
- struct is_valid_ip_arg arg = {
- .ipaddr = ipaddr,
- .ipmask = ipmask,
- .result = 0
- };
- status = ethsock_for_each_ip(sock, is_valid_ip_cb, &arg);
- return status < 0 ? status : arg.result;
- }
- static struct ethsock *gsock = NULL;
- static struct ethsock_ip_undo *g_ip_undo = NULL;
- static struct ethsock_arp_undo *g_arp_undo = NULL;
- static void sigh(int sig)
- {
- printf("\n");
- if (gsock) {
- ethsock_arp_del(gsock, &g_arp_undo);
- ethsock_ip_del(gsock, &g_ip_undo);
- ethsock_close(gsock);
- gsock = NULL;
- }
- exit(1);
- }
- static const char *spinner = "\\|/-";
- int nmrp_do(struct nmrpd_args *args)
- {
- struct nmrp_pkt tx, rx;
- uint8_t *src, dest[6];
- uint16_t len, region;
- char *filename;
- time_t beg;
- int i, status, ulreqs, expect, upload_ok, autoip;
- struct ethsock *sock;
- uint32_t intf_addr;
- void (*sigh_orig)(int);
- struct {
- struct in_addr addr;
- struct in_addr mask;
- } PACKED ipconf;
- if (args->op != NMRP_UPLOAD_FW) {
- fprintf(stderr, "Operation not implemented.\n");
- return 1;
- }
- if (!mac_parse(args->mac, dest)) {
- fprintf(stderr, "Invalid MAC address '%s'.\n", args->mac);
- return 1;
- }
- ipconf.mask.s_addr = inet_addr(args->ipmask);
- if (ipconf.mask.s_addr == INADDR_NONE
- || netmask(bitcount(ipconf.mask.s_addr)) != ipconf.mask.s_addr) {
- fprintf(stderr, "Invalid subnet mask '%s'.\n", args->ipmask);
- return 1;
- }
- if (!args->ipaddr) {
- autoip = true;
- /* The MAC of the device that was used to test this utility starts
- * with a4:2b:8c, hence 164 (0xa4) and 183 (0x2b + 0x8c)
- */
- args->ipaddr = "10.164.183.252";
- if (!args->ipaddr_intf) {
- args->ipaddr_intf = "10.164.183.253";
- }
- } else if (args->ipaddr_intf) {
- autoip = true;
- } else {
- autoip = false;
- }
- if ((ipconf.addr.s_addr = inet_addr(args->ipaddr)) == INADDR_NONE) {
- fprintf(stderr, "Invalid IP address '%s'.\n", args->ipaddr);
- return 1;
- }
- if (args->ipaddr_intf && (intf_addr = inet_addr(args->ipaddr_intf)) == INADDR_NONE) {
- fprintf(stderr, "Invalid IP address '%s'.\n", args->ipaddr_intf);
- return 1;
- }
- if (args->file_local && strcmp(args->file_local, "-") && access(args->file_local, R_OK) == -1) {
- fprintf(stderr, "Error accessing file '%s'.\n", args->file_local);
- return 1;
- }
- if (args->file_remote) {
- if (!tftp_is_valid_filename(args->file_remote)) {
- fprintf(stderr, "Invalid remote filename '%s'.\n",
- args->file_remote);
- return 1;
- }
- }
- if (args->region) {
- region = htons(to_region_code(args->region));
- if (!region) {
- fprintf(stderr, "Invalid region code '%s'.\n", args->region);
- return 1;
- }
- } else {
- region = 0;
- }
- status = 1;
- sock = ethsock_create(args->intf, ETH_P_NMRP);
- if (!sock) {
- return 1;
- }
- gsock = sock;
- sigh_orig = signal(SIGINT, sigh);
- if (!autoip) {
- status = is_valid_ip(sock, &ipconf.addr, &ipconf.mask);
- if (status <= 0) {
- if (!status) {
- fprintf(stderr, "Address %s/%s cannot be used on interface %s.\n",
- args->ipaddr, args->ipmask, args->intf);
- }
- goto out;
- }
- } else {
- if (verbosity) {
- printf("Adding %s to interface %s.\n", args->ipaddr_intf, args->intf);
- }
- if (ethsock_ip_add(sock, intf_addr, ipconf.mask.s_addr, &g_ip_undo) != 0) {
- goto out;
- }
- }
- if (ethsock_set_timeout(sock, args->rx_timeout)) {
- goto out;
- }
- src = ethsock_get_hwaddr(sock);
- if (!src) {
- goto out;
- }
- memcpy(tx.eh.ether_shost, src, 6);
- memcpy(tx.eh.ether_dhost, dest, 6);
- tx.eh.ether_type = htons(ETH_P_NMRP);
- msg_init(&tx.msg, NMRP_C_ADVERTISE);
- msg_opt_add(&tx.msg, NMRP_O_MAGIC_NO, "NTGR", 4);
- msg_hton(&tx.msg);
- i = 0;
- upload_ok = 0;
- beg = time_monotonic();
- while (1) {
- printf("\rAdvertising NMRP server on %s ... %c",
- args->intf, spinner[i]);
- fflush(stdout);
- i = (i + 1) & 3;
- if (pkt_send(sock, &tx) < 0) {
- perror("sendto");
- goto out;
- }
- status = pkt_recv(sock, &rx);
- if (status == 0 && memcmp(rx.eh.ether_dhost, src, 6) == 0) {
- break;
- } else if (status == 1) {
- goto out;
- } else {
- if ((time_monotonic() - beg) >= 60) {
- printf("\nNo response after 60 seconds. Bailing out.\n");
- goto out;
- }
- #ifdef NMRPFLASH_FUZZ
- goto out;
- #endif
- }
- }
- printf("\n");
- expect = NMRP_C_CONF_REQ;
- ulreqs = 0;
- do {
- if (expect != NMRP_C_NONE && rx.msg.code != expect) {
- fprintf(stderr, "Received %s while waiting for %s!\n",
- msg_code_str(rx.msg.code), msg_code_str(expect));
- }
- msg_init(&tx.msg, NMRP_C_NONE);
- status = 1;
- switch (rx.msg.code) {
- case NMRP_C_ADVERTISE:
- printf("Received NMRP advertisement from %s.\n",
- mac_to_str(rx.eh.ether_shost));
- status = 1;
- goto out;
- case NMRP_C_CONF_REQ:
- tx.msg.code = NMRP_C_CONF_ACK;
- msg_opt_add(&tx.msg, NMRP_O_DEV_IP, &ipconf, 8);
- msg_opt_add(&tx.msg, NMRP_O_FW_UP, NULL, 0);
- #ifdef NMRPFLASH_SET_REGION
- if (region) {
- msg_opt_add(&tx.msg, NMRP_O_DEV_REGION, ®ion, 2);
- }
- #endif
- expect = NMRP_C_TFTP_UL_REQ;
- printf("Received configuration request from %s.\n",
- mac_to_str(rx.eh.ether_shost));
- memcpy(tx.eh.ether_dhost, rx.eh.ether_shost, 6);
- printf("Sending configuration: %s, netmask %s.\n",
- args->ipaddr, args->ipmask);
- if (ethsock_arp_add(sock, rx.eh.ether_shost, ipconf.addr.s_addr, &g_arp_undo) != 0) {
- goto out;
- }
- break;
- case NMRP_C_TFTP_UL_REQ:
- if (!upload_ok) {
- if (++ulreqs > 5) {
- printf("Bailing out after %d upload requests.\n",
- ulreqs);
- tx.msg.code = NMRP_C_CLOSE_REQ;
- break;
- }
- } else {
- if (verbosity) {
- printf("Ignoring extra upload request.\n");
- }
- ethsock_set_timeout(sock, args->ul_timeout);
- tx.msg.code = NMRP_C_KEEP_ALIVE_REQ;
- break;
- }
- len = 0;
- filename = msg_opt_data(&rx.msg, NMRP_O_FILE_NAME, &len);
- if (filename) {
- if (!args->file_remote) {
- args->file_remote = filename;
- }
- printf("Received upload request: filename '%.*s'.\n",
- len, filename);
- } else if (!args->file_remote) {
- args->file_remote = args->file_local;
- printf("Received upload request with empty filename.\n");
- }
- status = 0;
- if (args->tftpcmd) {
- printf("Executing '%s' ... \n", args->tftpcmd);
- setenv("IP", inet_ntoa(ipconf.addr), 1);
- setenv("PORT", lltostr(args->port, 10), 1);
- setenv("MAC", mac_to_str(rx.eh.ether_shost), 1);
- setenv("NETMASK", inet_ntoa(ipconf.mask), 1);
- //setenv("FILENAME", args->file_remote ? args->file_remote : "", 1);
- status = system(args->tftpcmd);
- }
- if (!status && args->file_local) {
- if (!autoip) {
- status = is_valid_ip(sock, &ipconf.addr, &ipconf.mask);
- if (status < 0) {
- goto out;
- } else if (!status) {
- printf("IP address of %s has changed. Please assign a "
- "static ip to the interface.\n", args->intf);
- tx.msg.code = NMRP_C_CLOSE_REQ;
- break;
- }
- }
- if (verbosity) {
- printf("Using remote filename '%s'.\n",
- args->file_remote);
- }
- if (!strcmp(args->file_local, "-")) {
- printf("Uploading from stdin ... ");
- } else {
- printf("Uploading %s ... ", leafname(args->file_local));
- }
- fflush(stdout);
- status = tftp_put(args);
- }
- if (!status) {
- printf("OK\nWaiting for remote to respond.\n");
- upload_ok = 1;
- ethsock_set_timeout(sock, args->ul_timeout);
- tx.msg.code = NMRP_C_KEEP_ALIVE_REQ;
- expect = NMRP_C_NONE;
- } else if (status == -2) {
- expect = NMRP_C_TFTP_UL_REQ;
- } else {
- goto out;
- }
- break;
- case NMRP_C_KEEP_ALIVE_REQ:
- tx.msg.code = NMRP_C_KEEP_ALIVE_ACK;
- ethsock_set_timeout(sock, args->ul_timeout);
- printf("Received keep-alive request.\n");
- break;
- case NMRP_C_CLOSE_REQ:
- tx.msg.code = NMRP_C_CLOSE_ACK;
- break;
- case NMRP_C_CLOSE_ACK:
- status = 0;
- goto out;
- default:
- fprintf(stderr, "Unknown message code 0x%02x!\n",
- rx.msg.code);
- msg_dump(&rx.msg);
- }
- if (tx.msg.code != NMRP_C_NONE) {
- msg_hton(&tx.msg);
- if (pkt_send(sock, &tx) < 0) {
- perror("sendto");
- goto out;
- }
- if (tx.msg.code == NMRP_C_CLOSE_REQ) {
- goto out;
- }
- }
- if (rx.msg.code == NMRP_C_CLOSE_REQ) {
- printf("Remote finished. Closing connection.\n");
- break;
- }
- status = pkt_recv(sock, &rx);
- if (status) {
- if (status == 2) {
- fprintf(stderr, "Timeout while waiting for %s.\n",
- msg_code_str(expect));
- }
- goto out;
- }
- ethsock_set_timeout(sock, args->rx_timeout);
- } while (1);
- status = 0;
- if (ulreqs) {
- printf("Reboot your device now.\n");
- } else {
- printf("No upload request received.\n");
- }
- out:
- signal(SIGINT, sigh_orig);
- gsock = NULL;
- ethsock_arp_del(sock, &g_arp_undo);
- ethsock_ip_del(sock, &g_ip_undo);
- ethsock_close(sock);
- return status;
- }
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