2 #include <netinet/ether.h>
3 #include <linux/if_packet.h>
5 #include <sys/socket.h>
16 #define NMRP_HDR_LEN 6
17 #define NMRP_OPT_LEN 4
18 #define NMRP_MIN_PKT_LEN (sizeof(struct ether_header) + NMRP_HDR_LEN)
20 #define ETH_P_NMRP 0x0912
22 #define PACKED __attribute__((__packed__))
23 #define MAX_LOOP_RECV 1024
32 NMRP_C_KEEP_ALIVE_REQ = 6,
33 NMRP_C_KEEP_ALIVE_ACK = 7,
34 NMRP_C_TFTP_UL_REQ = 16
38 NMRP_O_MAGIC_NO = 0x0001,
39 NMRP_O_DEV_IP = 0x0002,
40 NMRP_O_DEV_REGION = 0x0004,
41 NMRP_O_FW_UP = 0x0101,
42 NMRP_O_ST_UP = 0x0102,
43 NMRP_O_FILE_NAME = 0x0181
63 struct nmrp_opt opts[2];
68 struct ether_header eh;
72 static void msg_update_len(struct nmrp_msg *msg)
75 msg->len = NMRP_HDR_LEN;
76 for (; i != msg->num_opts; ++i) {
77 msg->len += msg->opts[i].len;
81 static void msg_dump(struct nmrp_msg *msg, int dump_opts)
84 int remain_len, len, i;
86 fprintf(stderr, "res=0x%04x, code=0x%02x, id=0x%02x, len=%u",
87 msg->reserved, msg->code, msg->id, msg->len);
89 remain_len = msg->len - NMRP_HDR_LEN;
90 fprintf(stderr, "%s\n", remain_len ? "" : " (no opts)");
95 while (remain_len > 0) {
97 fprintf(stderr, " opt type=%u, len=%u", opt->type, len);
98 for (i = 0; i != len - NMRP_OPT_LEN; ++i) {
100 fprintf(stderr, "\n ");
103 fprintf(stderr, "%02x ", ((char*)&opt->val)[i] & 0xff);
105 fprintf(stderr, "\n");
107 opt = (struct nmrp_opt*)(((char*)opt) + len);
112 static void msg_hton(struct nmrp_msg *msg)
116 msg->reserved = htons(msg->reserved);
117 msg->len = htons(msg->len);
119 for (; i != msg->num_opts; ++i) {
120 msg->opts[i].len = htons(msg->opts[i].len);
121 msg->opts[i].type = htons(msg->opts[i].type);
125 static void msg_hdr_ntoh(struct nmrp_msg *msg)
127 msg->reserved = ntohs(msg->reserved);
128 msg->len = ntohs(msg->len);
131 static int msg_ntoh(struct nmrp_msg *msg)
133 struct nmrp_opt *opt = msg->opts;
137 remaining = msg->len - NMRP_HDR_LEN;
139 while (remaining > 0) {
140 if (remaining < NMRP_OPT_LEN) {
141 fprintf(stderr, "Malformed message.\n");
146 opt->type = ntohs(opt->type);
147 opt->len = ntohs(opt->len);
149 remaining -= opt->len;
154 fprintf(stderr, "Trailing data in message.\n");
162 static int intf_get_info(int sock, const char *name, int *index,
167 memset(&ifr, 0, sizeof(ifr));
168 strncpy(ifr.ifr_name, name, IFNAMSIZ - 1);
170 if (ioctl(sock, SIOCGIFINDEX, &ifr) < 0) {
171 perror("ioctl(SIOCGIFINDEX)");
174 *index = ifr.ifr_ifindex;
176 if (ioctl(sock, SIOCGIFHWADDR, &ifr) < 0) {
177 perror("ioctl(SIOCGIFHWADDR)");
180 memcpy(hwaddr, ifr.ifr_hwaddr.sa_data, ETH_ALEN);
185 static int pkt_send(int sock, struct sockaddr_ll *addr, struct nmrp_pkt *pkt)
187 size_t len = ntohs(pkt->msg.len) + sizeof(pkt->eh);
188 return sendto(sock, pkt, len, 0, (struct sockaddr*)addr, sizeof(*addr));
191 static int pkt_recv(int sock, struct nmrp_pkt *pkt)
193 struct sockaddr_ll from;
197 memset(pkt, 0, sizeof(*pkt));
198 bytes = recvfrom(sock, pkt, NMRP_MIN_PKT_LEN, MSG_PEEK,
199 (struct sockaddr*)&from, &addrlen);
202 if (errno == EAGAIN) {
205 perror("recvfrom(pkt)");
207 } else if (ntohs(pkt->eh.ether_type) != ETH_P_NMRP) {
209 } else if (bytes < NMRP_MIN_PKT_LEN) {
210 fprintf(stderr, "Short packet (%zi bytes)\n", bytes);
214 msg_hdr_ntoh(&pkt->msg);
215 len = pkt->msg.len + sizeof(pkt->eh);
217 bytes = recvfrom(sock, pkt, len, MSG_DONTWAIT, NULL, NULL);
219 perror("recvfrom(msg)");
221 } else if (bytes != len) {
222 fprintf(stderr, "Unexpected message length (%zi bytes).\n", len);
225 if (msg_ntoh(&pkt->msg) != 0) {
234 static int sock_bind_to_intf(int sock, const char *name)
238 strncpy(ifr.ifr_name, name, IFNAMSIZ - 1);
239 if (setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr)) < 0) {
240 perror("setsockopt(SO_BINDTODEVICE)");
247 static int mac_parse(const char *str, uint8_t *hwaddr)
252 sscanf(str, "%02x:%02x:%02x:%02x:%02x:%02x%n",
253 data, data + 1, data + 2, data + 3, data + 4, data + 5, &i);
255 if (i == strlen(str)) {
256 for (i = 0; i != 6; ++i) {
261 hwaddr[i] = data[i] & 0xff;
271 static const char *spinner = "\\|/-";
273 int nmrp_do(struct nmrpd_args *args)
275 struct nmrp_pkt tx, rx;
276 struct sockaddr_ll addr;
277 uint8_t src[ETH_ALEN], dest[ETH_ALEN];
278 struct in_addr ipaddr, ipmask;
280 int i, sock, err, ulreqs, expect;
282 if (args->op != NMRP_UPLOAD_FW) {
283 fprintf(stderr, "Operation not implemented.\n");
287 if (!mac_parse(args->mac, dest)) {
288 fprintf(stderr, "Invalid MAC address '%s'.\n", args->mac);
292 if (!inet_aton(args->ipaddr, &ipaddr)) {
293 fprintf(stderr, "Invalid IP address '%s'.\n", args->ipaddr);
297 if (!inet_aton(args->ipmask, &ipmask)) {
298 fprintf(stderr, "Invalid subnet mask '%s'.\n", args->ipmask);
302 if (access(args->filename, R_OK) == -1) {
303 fprintf(stderr, "Error accessing file '%s'.\n", args->filename);
309 sock = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_NMRP));
315 if (intf_get_info(sock, args->intf, &addr.sll_ifindex, src)) {
319 if (sock_bind_to_intf(sock, args->intf)) {
323 if (sock_set_rx_timeout(sock, args->rx_timeout)) {
327 addr.sll_family = AF_PACKET;
328 addr.sll_protocol = htons(ETH_P_NMRP);
329 addr.sll_halen = ETH_ALEN;
330 memcpy(addr.sll_addr, dest, ETH_ALEN);
332 memcpy(tx.eh.ether_shost, src, ETH_ALEN);
333 memcpy(tx.eh.ether_dhost, dest, ETH_ALEN);
334 tx.eh.ether_type = htons(ETH_P_NMRP);
337 tx.msg.code = NMRP_C_ADVERTISE;
340 tx.msg.opts[0].type = NMRP_O_MAGIC_NO;
341 tx.msg.opts[0].len = NMRP_OPT_LEN + 4;
342 tx.msg.opts[0].val.magic[0] = 'N';
343 tx.msg.opts[0].val.magic[1] = 'T';
344 tx.msg.opts[0].val.magic[2] = 'G';
345 tx.msg.opts[0].val.magic[3] = 'R';
347 msg_update_len(&tx.msg);
354 printf("\rAdvertising NMRP server on %s ... %c", args->intf,
359 if (pkt_send(sock, &addr, &tx) < 0) {
364 err = pkt_recv(sock, &rx);
365 if (err == 0 && memcmp(rx.eh.ether_dhost, src, ETH_ALEN) == 0) {
367 } else if (err == 1) {
371 if ((time(NULL) - beg) >= 60) {
372 printf("\nNo response after 60 seconds. Bailing out.\n");
380 expect = NMRP_C_CONF_REQ;
384 if (expect != NMRP_C_NONE && rx.msg.code != expect) {
385 fprintf(stderr, "Received code 0x%02x while waiting for 0x%02x!\n",
386 rx.msg.code, expect);
389 tx.msg.code = NMRP_C_NONE;
397 switch (rx.msg.code) {
398 case NMRP_C_ADVERTISE:
399 printf("Received NMRP advertisement from "
400 "%02x:%02x:%02x:%02x:%02x:%02x.\n",
401 rx.eh.ether_shost[0], rx.eh.ether_shost[1],
402 rx.eh.ether_shost[2], rx.eh.ether_shost[3],
403 rx.eh.ether_shost[4], rx.eh.ether_shost[5]);
406 case NMRP_C_CONF_REQ:
407 tx.msg.code = NMRP_C_CONF_ACK;
410 tx.msg.opts[0].type = NMRP_O_DEV_IP;
411 tx.msg.opts[0].len = NMRP_OPT_LEN + 2 * IP_LEN;
413 memcpy(tx.msg.opts[0].val.ip.addr, &ipaddr, IP_LEN);
414 memcpy(tx.msg.opts[0].val.ip.mask, &ipmask, IP_LEN);
416 tx.msg.opts[1].type = NMRP_O_FW_UP;
417 tx.msg.opts[1].len = NMRP_OPT_LEN;
419 expect = NMRP_C_TFTP_UL_REQ;
421 printf("Configuration request received from "
422 "%02x:%02x:%02x:%02x:%02x:%02x.\n",
423 rx.eh.ether_shost[0], rx.eh.ether_shost[1],
424 rx.eh.ether_shost[2], rx.eh.ether_shost[3],
425 rx.eh.ether_shost[4], rx.eh.ether_shost[5]);
427 memcpy(tx.eh.ether_dhost, rx.eh.ether_shost, ETH_ALEN);
428 memcpy(addr.sll_addr, rx.eh.ether_shost, ETH_ALEN);
430 printf("Sending configuration: ip %s, mask %s.\n",
431 args->ipaddr, args->ipmask);
434 case NMRP_C_TFTP_UL_REQ:
436 fprintf(stderr, "Device re-requested file upload %d "
437 "times; aborting.\n", ulreqs);
438 tx.msg.code = NMRP_C_CLOSE_REQ;
442 if (!args->tftpcmd) {
443 printf("Uploading %s ... ", args->filename);
445 err = tftp_put(args);
447 printf("Running %s ... ", args->tftpcmd);
449 err = system(args->tftpcmd);
453 printf("OK\nWaiting for remote to respond.\n");
454 sock_set_rx_timeout(sock, args->ul_timeout);
455 expect = NMRP_C_CLOSE_REQ;
462 case NMRP_C_KEEP_ALIVE_REQ:
463 tx.msg.code = NMRP_C_KEEP_ALIVE_ACK;
465 case NMRP_C_CLOSE_REQ:
466 tx.msg.code = NMRP_C_CLOSE_ACK;
468 case NMRP_C_CLOSE_ACK:
472 fprintf(stderr, "Unknown message code 0x%02x!\n",
474 msg_dump(&rx.msg, 0);
477 if (tx.msg.code != NMRP_C_NONE) {
478 msg_update_len(&tx.msg);
481 if (pkt_send(sock, &addr, &tx) < 0) {
487 if (rx.msg.code == NMRP_C_CLOSE_REQ) {
488 printf("Remote finished. Closing connection.\n");
492 err = pkt_recv(sock, &rx);
495 fprintf(stderr, "Timeout while waiting for 0x%02x.\n", expect);
500 sock_set_rx_timeout(sock, args->rx_timeout);