2 * nmrp-flash - Netgear Unbrick Utility
3 * Copyright (C) 2016 Joseph Lehner <joseph.c.lehner@gmail.com>
5 * nmrp-flash is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 3 of the License, or
8 * (at your option) any later version.
10 * nmrp-flash is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with nmrp-flash. If not, see <http://www.gnu.org/licenses/>.
21 #include <netinet/ether.h>
22 #include <linux/if_packet.h>
23 #include <arpa/inet.h>
24 #include <sys/socket.h>
25 #include <sys/ioctl.h>
35 #define NMRP_HDR_LEN 6
36 #define NMRP_OPT_LEN 4
37 #define NMRP_MIN_PKT_LEN (sizeof(struct ether_header) + NMRP_HDR_LEN)
39 #define MAX_OPT_SIZE 12
42 #define ETH_P_NMRP 0x0912
44 #define PACKED __attribute__((__packed__))
45 #define MAX_LOOP_RECV 1024
54 NMRP_C_KEEP_ALIVE_REQ = 6,
55 NMRP_C_KEEP_ALIVE_ACK = 7,
56 NMRP_C_TFTP_UL_REQ = 16
60 NMRP_O_MAGIC_NO = 0x0001,
61 NMRP_O_DEV_IP = 0x0002,
62 NMRP_O_DEV_REGION = 0x0004,
63 NMRP_O_FW_UP = 0x0101,
64 NMRP_O_ST_UP = 0x0102,
65 NMRP_O_FILE_NAME = 0x0181
85 struct nmrp_opt opts[2];
90 struct ether_header eh;
94 static void msg_update_len(struct nmrp_msg *msg)
97 msg->len = NMRP_HDR_LEN;
98 for (; i != msg->num_opts; ++i) {
99 msg->len += msg->opts[i].len;
103 static void msg_dump(struct nmrp_msg *msg, int dump_opts)
105 struct nmrp_opt *opt;
106 int remain_len, len, i;
108 fprintf(stderr, "res=0x%04x, code=0x%02x, id=0x%02x, len=%u",
109 msg->reserved, msg->code, msg->id, msg->len);
111 remain_len = msg->len - NMRP_HDR_LEN;
112 fprintf(stderr, "%s\n", remain_len ? "" : " (no opts)");
117 while (remain_len > 0) {
119 fprintf(stderr, " opt type=%u, len=%u", opt->type, len);
120 for (i = 0; i != len - NMRP_OPT_LEN; ++i) {
122 fprintf(stderr, "\n ");
125 fprintf(stderr, "%02x ", ((char*)&opt->val)[i] & 0xff);
127 fprintf(stderr, "\n");
129 opt = (struct nmrp_opt*)(((char*)opt) + len);
134 static void msg_hton(struct nmrp_msg *msg)
138 msg->reserved = htons(msg->reserved);
139 msg->len = htons(msg->len);
141 for (; i != msg->num_opts; ++i) {
142 msg->opts[i].len = htons(msg->opts[i].len);
143 msg->opts[i].type = htons(msg->opts[i].type);
147 static void msg_hdr_ntoh(struct nmrp_msg *msg)
149 msg->reserved = ntohs(msg->reserved);
150 msg->len = ntohs(msg->len);
153 static int msg_ntoh(struct nmrp_msg *msg)
155 struct nmrp_opt *opt = msg->opts;
159 remaining = msg->len - NMRP_HDR_LEN;
161 // FIXME maximum of two options supported, maximum option
163 if (remaining < MAX_OPT_NUM * MAX_OPT_SIZE) {
164 while (remaining > 0) {
165 if (remaining < NMRP_OPT_LEN) {
169 opt->type = ntohs(opt->type);
170 opt->len = ntohs(opt->len);
172 if (opt->len > MAX_OPT_SIZE) {
176 remaining -= opt->len;
185 fprintf(stderr, "Unexpected message format.\n");
190 static int intf_get_info(int sock, const char *name, int *index,
195 memset(&ifr, 0, sizeof(ifr));
196 strncpy(ifr.ifr_name, name, IFNAMSIZ - 1);
198 if (ioctl(sock, SIOCGIFINDEX, &ifr) < 0) {
199 perror("ioctl(SIOCGIFINDEX)");
202 *index = ifr.ifr_ifindex;
204 if (ioctl(sock, SIOCGIFHWADDR, &ifr) < 0) {
205 perror("ioctl(SIOCGIFHWADDR)");
208 memcpy(hwaddr, ifr.ifr_hwaddr.sa_data, ETH_ALEN);
213 static int pkt_send(int sock, struct sockaddr_ll *addr, struct nmrp_pkt *pkt)
215 size_t len = ntohs(pkt->msg.len) + sizeof(pkt->eh);
216 return sendto(sock, pkt, len, 0, (struct sockaddr*)addr, sizeof(*addr));
219 static int pkt_recv(int sock, struct nmrp_pkt *pkt)
221 struct sockaddr_ll from;
225 memset(pkt, 0, sizeof(*pkt));
226 bytes = recvfrom(sock, pkt, NMRP_MIN_PKT_LEN, MSG_PEEK,
227 (struct sockaddr*)&from, &addrlen);
230 if (errno == EAGAIN) {
233 perror("recvfrom(pkt)");
235 } else if (ntohs(pkt->eh.ether_type) != ETH_P_NMRP) {
237 } else if (bytes < NMRP_MIN_PKT_LEN) {
238 fprintf(stderr, "Short packet (%zi bytes)\n", bytes);
242 msg_hdr_ntoh(&pkt->msg);
243 len = pkt->msg.len + sizeof(pkt->eh);
245 bytes = recvfrom(sock, pkt, len, MSG_DONTWAIT, NULL, NULL);
247 perror("recvfrom(msg)");
249 } else if (bytes != len) {
250 fprintf(stderr, "Unexpected message length (%zi bytes).\n", len);
253 if (msg_ntoh(&pkt->msg) != 0) {
262 static int sock_bind_to_intf(int sock, const char *name)
266 strncpy(ifr.ifr_name, name, IFNAMSIZ - 1);
267 if (setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr)) < 0) {
268 perror("setsockopt(SO_BINDTODEVICE)");
275 static int mac_parse(const char *str, uint8_t *hwaddr)
280 sscanf(str, "%02x:%02x:%02x:%02x:%02x:%02x%n",
281 data, data + 1, data + 2, data + 3, data + 4, data + 5, &i);
283 if (i == strlen(str)) {
284 for (i = 0; i != 6; ++i) {
289 hwaddr[i] = data[i] & 0xff;
299 static const char *spinner = "\\|/-";
301 int nmrp_do(struct nmrpd_args *args)
303 struct nmrp_pkt tx, rx;
304 struct sockaddr_ll addr;
305 uint8_t src[ETH_ALEN], dest[ETH_ALEN];
306 struct in_addr ipaddr, ipmask;
308 int i, sock, err, ulreqs, expect;
310 if (args->op != NMRP_UPLOAD_FW) {
311 fprintf(stderr, "Operation not implemented.\n");
315 if (!mac_parse(args->mac, dest)) {
316 fprintf(stderr, "Invalid MAC address '%s'.\n", args->mac);
320 if (!inet_aton(args->ipaddr, &ipaddr)) {
321 fprintf(stderr, "Invalid IP address '%s'.\n", args->ipaddr);
325 if (!inet_aton(args->ipmask, &ipmask)) {
326 fprintf(stderr, "Invalid subnet mask '%s'.\n", args->ipmask);
330 if (access(args->filename, R_OK) == -1) {
331 fprintf(stderr, "Error accessing file '%s'.\n", args->filename);
337 sock = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_NMRP));
343 if (intf_get_info(sock, args->intf, &addr.sll_ifindex, src)) {
347 if (sock_bind_to_intf(sock, args->intf)) {
351 if (sock_set_rx_timeout(sock, args->rx_timeout)) {
355 addr.sll_family = AF_PACKET;
356 addr.sll_protocol = htons(ETH_P_NMRP);
357 addr.sll_halen = ETH_ALEN;
358 memcpy(addr.sll_addr, dest, ETH_ALEN);
360 memcpy(tx.eh.ether_shost, src, ETH_ALEN);
361 memcpy(tx.eh.ether_dhost, dest, ETH_ALEN);
362 tx.eh.ether_type = htons(ETH_P_NMRP);
365 tx.msg.code = NMRP_C_ADVERTISE;
368 tx.msg.opts[0].type = NMRP_O_MAGIC_NO;
369 tx.msg.opts[0].len = NMRP_OPT_LEN + 4;
370 tx.msg.opts[0].val.magic[0] = 'N';
371 tx.msg.opts[0].val.magic[1] = 'T';
372 tx.msg.opts[0].val.magic[2] = 'G';
373 tx.msg.opts[0].val.magic[3] = 'R';
375 msg_update_len(&tx.msg);
382 printf("\rAdvertising NMRP server on %s ... %c", args->intf,
387 if (pkt_send(sock, &addr, &tx) < 0) {
392 err = pkt_recv(sock, &rx);
393 if (err == 0 && memcmp(rx.eh.ether_dhost, src, ETH_ALEN) == 0) {
395 } else if (err == 1) {
399 if ((time(NULL) - beg) >= 60) {
400 printf("\nNo response after 60 seconds. Bailing out.\n");
408 expect = NMRP_C_CONF_REQ;
412 if (expect != NMRP_C_NONE && rx.msg.code != expect) {
413 fprintf(stderr, "Received code 0x%02x while waiting for 0x%02x!\n",
414 rx.msg.code, expect);
417 tx.msg.code = NMRP_C_NONE;
425 switch (rx.msg.code) {
426 case NMRP_C_ADVERTISE:
427 printf("Received NMRP advertisement from "
428 "%02x:%02x:%02x:%02x:%02x:%02x.\n",
429 rx.eh.ether_shost[0], rx.eh.ether_shost[1],
430 rx.eh.ether_shost[2], rx.eh.ether_shost[3],
431 rx.eh.ether_shost[4], rx.eh.ether_shost[5]);
434 case NMRP_C_CONF_REQ:
435 tx.msg.code = NMRP_C_CONF_ACK;
438 tx.msg.opts[0].type = NMRP_O_DEV_IP;
439 tx.msg.opts[0].len = NMRP_OPT_LEN + 2 * IP_LEN;
441 memcpy(tx.msg.opts[0].val.ip.addr, &ipaddr, IP_LEN);
442 memcpy(tx.msg.opts[0].val.ip.mask, &ipmask, IP_LEN);
444 tx.msg.opts[1].type = NMRP_O_FW_UP;
445 tx.msg.opts[1].len = NMRP_OPT_LEN;
447 expect = NMRP_C_TFTP_UL_REQ;
449 printf("Received configuration request from "
450 "%02x:%02x:%02x:%02x:%02x:%02x.\n",
451 rx.eh.ether_shost[0], rx.eh.ether_shost[1],
452 rx.eh.ether_shost[2], rx.eh.ether_shost[3],
453 rx.eh.ether_shost[4], rx.eh.ether_shost[5]);
455 memcpy(tx.eh.ether_dhost, rx.eh.ether_shost, ETH_ALEN);
456 memcpy(addr.sll_addr, rx.eh.ether_shost, ETH_ALEN);
458 printf("Sending configuration: ip %s, mask %s.\n",
459 args->ipaddr, args->ipmask);
462 case NMRP_C_TFTP_UL_REQ:
464 fprintf(stderr, "Device re-requested file upload %d "
465 "times; aborting.\n", ulreqs);
466 tx.msg.code = NMRP_C_CLOSE_REQ;
470 if (!args->tftpcmd) {
471 printf("Uploading %s ... ", args->filename);
473 err = tftp_put(args);
475 printf("Running %s ... ", args->tftpcmd);
477 err = system(args->tftpcmd);
481 printf("OK\nWaiting for remote to respond.\n");
482 sock_set_rx_timeout(sock, args->ul_timeout);
483 expect = NMRP_C_CLOSE_REQ;
490 case NMRP_C_KEEP_ALIVE_REQ:
491 tx.msg.code = NMRP_C_KEEP_ALIVE_ACK;
493 case NMRP_C_CLOSE_REQ:
494 tx.msg.code = NMRP_C_CLOSE_ACK;
496 case NMRP_C_CLOSE_ACK:
500 fprintf(stderr, "Unknown message code 0x%02x!\n",
502 msg_dump(&rx.msg, 0);
505 if (tx.msg.code != NMRP_C_NONE) {
506 msg_update_len(&tx.msg);
509 if (pkt_send(sock, &addr, &tx) < 0) {
515 if (rx.msg.code == NMRP_C_CLOSE_REQ) {
516 printf("Remote finished. Closing connection.\n");
520 err = pkt_recv(sock, &rx);
523 fprintf(stderr, "Timeout while waiting for 0x%02x.\n", expect);
528 sock_set_rx_timeout(sock, args->rx_timeout);