nmrp.c

   1 /**
   2  * nmrpflash - Netgear Unbrick Utility
   3  * Copyright (C) 2016 Joseph Lehner <joseph.c.lehner@gmail.com>
   4  *
   5  * nmrpflash 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.
   9  *
  10  * nmrpflash 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.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with nmrpflash.  If not, see <http://www.gnu.org/licenses/>.
  17  *
  18  */
  19
  20 #include <signal.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <unistd.h>
  24 #include <errno.h>
  25 #include <stdio.h>
  26 #include <time.h>
  27 #include "nmrpd.h"
  28
  29 #define NMRP_HDR_LEN 6
  30 #define NMRP_OPT_HDR_LEN 4
  31 #define NMRP_MIN_PKT_LEN (sizeof(struct eth_hdr) +  NMRP_HDR_LEN)
  32
  33 #define ETH_P_NMRP 0x0912
  34
  35 #ifndef PACKED
  36 #define PACKED __attribute__((__packed__))
  37 #endif
  38
  39 #ifdef NMRPFLASH_WINDOWS
  40 #define setenv(name, value, overwrite) SetEnvironmentVariable(name, value)
  41 #endif
  42
  43 enum nmrp_code {
  44         NMRP_C_NONE = 0,
  45         NMRP_C_ADVERTISE = 1,
  46         NMRP_C_CONF_REQ = 2,
  47         NMRP_C_CONF_ACK = 3,
  48         NMRP_C_CLOSE_REQ = 4,
  49         NMRP_C_CLOSE_ACK = 5,
  50         NMRP_C_KEEP_ALIVE_REQ = 6,
  51         NMRP_C_KEEP_ALIVE_ACK = 7,
  52         NMRP_C_TFTP_UL_REQ = 16
  53 };
  54
  55 enum nmrp_opt_type {
  56         NMRP_O_MAGIC_NO = 0x0001,
  57         NMRP_O_DEV_IP = 0x0002,
  58         NMRP_O_DEV_REGION = 0x0004,
  59         NMRP_O_FW_UP = 0x0101,
  60         NMRP_O_ST_UP = 0x0102,
  61         NMRP_O_FILE_NAME = 0x0181
  62 };
  63
  64 struct nmrp_opt {
  65         uint16_t type;
  66         uint16_t len;
  67         char val[1];
  68 } PACKED;
  69
  70 struct nmrp_msg {
  71         uint16_t reserved;
  72         uint8_t code;
  73         uint8_t id;
  74         uint16_t len;
  75         char opts[44];
  76 } PACKED;
  77
  78 struct nmrp_pkt {
  79         struct eth_hdr eh;
  80         struct nmrp_msg msg;
  81 } PACKED;
  82
  83 static const char *msg_code_str(uint16_t code)
  84 {
  85 #define MSG_CODE(x) case NMRP_C_ ## x: return #x
  86         static char buf[16];
  87
  88         switch (code) {
  89                 MSG_CODE(ADVERTISE);
  90                 MSG_CODE(CONF_REQ);
  91                 MSG_CODE(CONF_ACK);
  92                 MSG_CODE(CLOSE_REQ);
  93                 MSG_CODE(CLOSE_ACK);
  94                 MSG_CODE(KEEP_ALIVE_REQ);
  95                 MSG_CODE(KEEP_ALIVE_ACK);
  96                 MSG_CODE(TFTP_UL_REQ);
  97                 default:
  98                         snprintf(buf, sizeof(buf), "%04x", ntohs(code));
  99                         return buf;
 100         }
 101 #undef MSG_CODE
 102 }
 103
 104 static uint16_t to_region_code(const char *region)
 105 {
 106 #define REGION_CODE(r, c) if (!strcasecmp(region, r)) return htons(c)
 107         REGION_CODE("NA", 0x0001);
 108         REGION_CODE("WW", 0x0002);
 109         REGION_CODE("GR", 0x0003);
 110         REGION_CODE("PR", 0x0004);
 111         REGION_CODE("RU", 0x0005);
 112         REGION_CODE("BZ", 0x0006);
 113         REGION_CODE("IN", 0x0007);
 114         REGION_CODE("KO", 0x0008);
 115         REGION_CODE("JP", 0x0009);
 116 #undef REGION_CODE
 117         return 0;
 118 }
 119
 120 static void msg_dump(struct nmrp_msg *msg)
 121 {
 122         int rem;
 123
 124         fprintf(stderr, "res=0x%04x, code=0x%02x, id=0x%02x, len=%u",
 125                         ntohs(msg->reserved), msg->code, msg->id, ntohs(msg->len));
 126
 127         rem = ntohs(msg->len) - NMRP_HDR_LEN;
 128         fprintf(stderr, "%s\n", rem ? "" : " (no opts)");
 129 }
 130
 131 static void *msg_opt(struct nmrp_msg *msg, uint16_t type, uint16_t* len)
 132 {
 133         struct nmrp_opt* opt = (struct nmrp_opt*)msg->opts;
 134         size_t rem = ntohs(msg->len) - NMRP_HDR_LEN;
 135         uint16_t olen;
 136
 137         do {
 138                 olen = ntohs(opt->len);
 139                 if (olen < NMRP_OPT_HDR_LEN || olen > rem) {
 140                         break;
 141                 }
 142
 143                 if (ntohs(opt->type) == type) {
 144                         if (len) {
 145                                 *len = olen;
 146                         }
 147
 148                         return opt->val;
 149                 }
 150
 151                 rem -= olen;
 152         } while (rem);
 153
 154         return NULL;
 155 }
 156
 157 static char *msg_filename(struct nmrp_msg *msg)
 158 {
 159         static char buf[256];
 160         uint16_t len;
 161         char *p = msg_opt(msg, NMRP_O_FILE_NAME, &len);
 162         if (p) {
 163                 len = MIN(sizeof(buf) - 1, len);
 164                 memcpy(buf, p, len);
 165                 buf[len] = '\0';
 166                 return buf;
 167         }
 168
 169         return NULL;
 170 }
 171
 172 static inline void msg_init(struct nmrp_msg *msg, uint16_t code)
 173 {
 174         memset(msg, 0, sizeof(*msg));
 175         msg->len = htons(NMRP_HDR_LEN);
 176         msg->code = code;
 177 }
 178
 179 static char *msg_mkopt(struct nmrp_msg *msg, char *p, uint16_t type, const void *val, size_t len)
 180 {
 181         struct nmrp_opt* opt = (struct nmrp_opt*)p;
 182
 183         len &= 0xffff;
 184
 185         msg->len = ntohs(msg->len);
 186
 187         if ((msg->len + len > sizeof(*msg))) {
 188                 fprintf(stderr, "Error: invalid option - this is a bug\n");
 189                 exit(1);
 190         }
 191
 192         opt->type = htons(type);
 193         opt->len = NMRP_OPT_HDR_LEN + len;
 194
 195         if (val) {
 196                 memcpy(opt->val, val, len);
 197         }
 198
 199         msg->len += opt->len;
 200         p += opt->len;
 201
 202         msg->len = htons(msg->len);
 203         opt->len = htons(opt->len);
 204
 205         return p;
 206 }
 207
 208 static void msg_mkadvertise(struct nmrp_msg *msg, const char *magic)
 209 {
 210         msg_init(msg, NMRP_C_ADVERTISE);
 211         msg_mkopt(msg, msg->opts, NMRP_O_MAGIC_NO, magic, strlen(magic));
 212 }
 213
 214 static void msg_mkconfack(struct nmrp_msg *msg, uint32_t ipaddr, uint32_t ipmask, uint16_t region)
 215 {
 216         char *p;
 217         struct {
 218                 uint32_t addr;
 219                 uint32_t mask;
 220         } PACKED ip = {
 221                 .addr = ipaddr,
 222                 .mask = ipmask
 223         };
 224
 225         msg_init(msg, NMRP_C_CONF_ACK);
 226         p = msg_mkopt(msg, msg->opts, NMRP_O_DEV_IP, &ip, 8);
 227         p = msg_mkopt(msg, p, NMRP_O_FW_UP, NULL, 0);
 228
 229 #ifdef NMRPFLASH_SET_REGION
 230         if (region) {
 231                 p = msg_mkopt(msg, p, NMRP_O_DEV_REGION, &region, 2);
 232         }
 233 #endif
 234 }
 235
 236 #ifdef NMRPFLASH_FUZZ
 237 #define NMRP_INITIAL_TIMEOUT 0
 238 #define ethsock_create(a, b) ((struct ethsock*)1)
 239 #define ethsock_get_hwaddr(a) ethsock_get_hwaddr_fake(a)
 240 #define ethsock_recv(sock, buf, len) read(STDIN_FILENO, buf, len)
 241 #define ethsock_send(a, b, c) (0)
 242 #define ethsock_set_timeout(a, b) (0)
 243 #define ethsock_ip_add(a, b, c, d) (0)
 244 #define ethsock_ip_del(a, b) (0)
 245 #define ethsock_close(a) (0)
 246 #define tftp_put(a) (0)
 247
 248 static uint8_t *ethsock_get_hwaddr_fake(struct ethsock* sock)
 249 {
 250         static uint8_t hwaddr[6] = { 0xfa, 0xfa, 0xfa, 0xfa, 0xfa, 0xfa };
 251         return hwaddr;
 252 }
 253 #else
 254 #define NMRP_INITIAL_TIMEOUT 60
 255 #endif
 256
 257 static int pkt_send(struct ethsock *sock, struct nmrp_pkt *pkt)
 258 {
 259         return ethsock_send(sock, pkt, sizeof(*pkt));
 260 }
 261
 262 static int pkt_recv(struct ethsock *sock, struct nmrp_pkt *pkt)
 263 {
 264         ssize_t bytes, len;
 265
 266         memset(pkt, 0, sizeof(*pkt));
 267         bytes = ethsock_recv(sock, pkt, sizeof(*pkt));
 268         if (bytes < 0) {
 269                 return 1;
 270         } else if (!bytes) {
 271                 return 2;
 272         } else if (bytes < NMRP_MIN_PKT_LEN) {
 273                 fprintf(stderr, "Short packet (%d bytes)\n", (int)bytes);
 274                 return 1;
 275         }
 276
 277         len = ntohs(pkt->msg.len) + sizeof(pkt->eh);
 278
 279         if (bytes < len) {
 280                 fprintf(stderr, "Short packet (expected %d, got %d).\n",
 281                                 (int)len, (int)bytes);
 282                 return 1;
 283         } else if (bytes > sizeof(pkt->msg) + sizeof(pkt->eh)) {
 284                 fprintf(stderr, "Packet size exceeds maximum (got %d).\n",
 285                                 (int)bytes);
 286         }
 287
 288         return 0;
 289 }
 290
 291 static int mac_parse(const char *str, uint8_t *hwaddr)
 292 {
 293         int i;
 294         unsigned data[6];
 295
 296         sscanf(str, "%02x:%02x:%02x:%02x:%02x:%02x%n",
 297                         data, data + 1, data + 2, data + 3, data + 4, data + 5, &i);
 298
 299         if (i == strlen(str)) {
 300                 for (i = 0; i != 6; ++i) {
 301                         if (data[i] > 255) {
 302                                 break;
 303                         }
 304
 305                         hwaddr[i] = data[i] & 0xff;
 306                 }
 307
 308                 if (i == 6) {
 309                         return 1;
 310                 }
 311         }
 312         return 0;
 313 }
 314
 315 struct is_valid_ip_arg
 316 {
 317         struct in_addr *ipaddr;
 318         struct in_addr *ipmask;
 319         int result;
 320 };
 321
 322 static int is_valid_ip_cb(struct ethsock_ip_callback_args *args)
 323 {
 324 #define SUBNET(x) ((x)->ipaddr->s_addr & (x)->ipmask->s_addr)
 325         struct is_valid_ip_arg *arg = args->arg;
 326         if (SUBNET(args) == SUBNET(arg)) {
 327                 arg->result = args->ipaddr->s_addr != arg->ipaddr->s_addr;
 328                 return 0;
 329         }
 330
 331         return 1;
 332 #undef SUBNET
 333 }
 334
 335 static int is_valid_ip(struct ethsock *sock, struct in_addr *ipaddr,
 336                 struct in_addr *ipmask)
 337 {
 338         int status;
 339         struct is_valid_ip_arg arg = {
 340                 .ipaddr = ipaddr,
 341                 .ipmask = ipmask,
 342                 .result = 0
 343         };
 344
 345         status = ethsock_for_each_ip(sock, is_valid_ip_cb, &arg);
 346         return status < 0 ? status : arg.result;
 347 }
 348
 349 static void sigh(int sig)
 350 {
 351         g_interrupted = 1;
 352 }
 353
 354 static const char *spinner = "\\|/-";
 355
 356 int nmrp_do(struct nmrpd_args *args)
 357 {
 358         struct nmrp_pkt tx, rx;
 359         uint8_t *src, dest[6];
 360         uint16_t region;
 361         char *filename;
 362         time_t beg;
 363         int i, status, ulreqs, expect, upload_ok, autoip;
 364         struct ethsock *sock;
 365         struct ethsock_ip_undo *ip_undo = NULL;
 366         struct ethsock_arp_undo *arp_undo = NULL;
 367         uint32_t intf_addr;
 368         void (*sigh_orig)(int);
 369         struct {
 370                 struct in_addr addr;
 371                 struct in_addr mask;
 372         } PACKED ipconf;
 373
 374         if (args->op != NMRP_UPLOAD_FW) {
 375                 fprintf(stderr, "Operation not implemented.\n");
 376                 return 1;
 377         }
 378
 379         if (!mac_parse(args->mac, dest)) {
 380                 fprintf(stderr, "Invalid MAC address '%s'.\n", args->mac);
 381                 return 1;
 382         }
 383
 384         ipconf.mask.s_addr = inet_addr(args->ipmask);
 385         if (ipconf.mask.s_addr == INADDR_NONE
 386                         || netmask(bitcount(ipconf.mask.s_addr)) != ipconf.mask.s_addr) {
 387                 fprintf(stderr, "Invalid subnet mask '%s'.\n", args->ipmask);
 388                 return 1;
 389         }
 390
 391         if (!args->ipaddr) {
 392                 autoip = true;
 393                 /* The MAC of the device that was used to test this utility starts
 394                  * with a4:2b:8c, hence 164 (0xa4) and 183 (0x2b + 0x8c)
 395                  */
 396                 args->ipaddr = "10.164.183.252";
 397
 398                 if (!args->ipaddr_intf) {
 399                         args->ipaddr_intf = "10.164.183.253";
 400                 }
 401         } else if (args->ipaddr_intf) {
 402                 autoip = true;
 403         } else {
 404                 autoip = false;
 405         }
 406
 407         if ((ipconf.addr.s_addr = inet_addr(args->ipaddr)) == INADDR_NONE) {
 408                 fprintf(stderr, "Invalid IP address '%s'.\n", args->ipaddr);
 409                 return 1;
 410         }
 411
 412         if (args->ipaddr_intf && (intf_addr = inet_addr(args->ipaddr_intf)) == INADDR_NONE) {
 413                 fprintf(stderr, "Invalid IP address '%s'.\n", args->ipaddr_intf);
 414                 return 1;
 415         }
 416
 417         if (args->file_local && strcmp(args->file_local, "-") && access(args->file_local, R_OK) == -1) {
 418                 fprintf(stderr, "Error accessing file '%s'.\n", args->file_local);
 419                 return 1;
 420         }
 421
 422         if (args->file_remote) {
 423                 if (!tftp_is_valid_filename(args->file_remote)) {
 424                         fprintf(stderr, "Invalid remote filename '%s'.\n",
 425                                         args->file_remote);
 426                         return 1;
 427                 }
 428         }
 429
 430         if (args->region) {
 431                 region = to_region_code(args->region);
 432                 if (!region) {
 433                         fprintf(stderr, "Invalid region code '%s'.\n", args->region);
 434                         return 1;
 435                 }
 436         } else {
 437                 region = 0;
 438         }
 439
 440         status = 1;
 441
 442         sock = ethsock_create(args->intf, ETH_P_NMRP);
 443         if (!sock) {
 444                 return 1;
 445         }
 446
 447         sigh_orig = signal(SIGINT, sigh);
 448
 449         if (!autoip) {
 450                 status = is_valid_ip(sock, &ipconf.addr, &ipconf.mask);
 451                 if (status <= 0) {
 452                         if (!status) {
 453                                 fprintf(stderr, "Address %s/%s cannot be used on interface %s.\n",
 454                                                 args->ipaddr, args->ipmask, args->intf);
 455                         }
 456                         goto out;
 457                 }
 458         } else {
 459                 if (verbosity) {
 460                         printf("Adding %s to interface %s.\n", args->ipaddr_intf, args->intf);
 461                 }
 462
 463                 if (ethsock_ip_add(sock, intf_addr, ipconf.mask.s_addr, &ip_undo) != 0) {
 464                         goto out;
 465                 }
 466         }
 467
 468         if (ethsock_set_timeout(sock, args->rx_timeout)) {
 469                 goto out;
 470         }
 471
 472         src = ethsock_get_hwaddr(sock);
 473         if (!src) {
 474                 goto out;
 475         }
 476
 477         memcpy(tx.eh.ether_shost, src, 6);
 478         memcpy(tx.eh.ether_dhost, dest, 6);
 479         tx.eh.ether_type = htons(ETH_P_NMRP);
 480
 481         msg_mkadvertise(&tx.msg, "NTGR");
 482
 483         i = 0;
 484         upload_ok = 0;
 485         beg = time_monotonic();
 486
 487         while (!g_interrupted) {
 488                 printf("\rAdvertising NMRP server on %s ... %c",
 489                                 args->intf, spinner[i]);
 490                 fflush(stdout);
 491                 i = (i + 1) & 3;
 492
 493                 if (pkt_send(sock, &tx) < 0) {
 494                         xperror("sendto");
 495                         goto out;
 496                 }
 497
 498                 status = pkt_recv(sock, &rx);
 499                 if (status == 0 && memcmp(rx.eh.ether_dhost, src, 6) == 0) {
 500                         break;
 501                 } else if (status == 1) {
 502                         goto out;
 503                 } else {
 504                         /* because we don't want nmrpflash's exit status to be zero */
 505                         status = 1;
 506                         if ((time_monotonic() - beg) >= NMRP_INITIAL_TIMEOUT) {
 507                                 printf("\nNo response after 60 seconds. Bailing out.\n");
 508                                 goto out;
 509                         }
 510                 }
 511         }
 512
 513         printf("\n");
 514
 515         expect = NMRP_C_CONF_REQ;
 516         ulreqs = 0;
 517
 518         while (!g_interrupted) {
 519                 if (expect != NMRP_C_NONE && rx.msg.code != expect) {
 520                         fprintf(stderr, "Received %s while waiting for %s!\n",
 521                                         msg_code_str(rx.msg.code), msg_code_str(expect));
 522                 }
 523
 524                 msg_init(&tx.msg, NMRP_C_NONE);
 525
 526                 status = 1;
 527
 528                 switch (rx.msg.code) {
 529                         case NMRP_C_ADVERTISE:
 530                                 printf("Received NMRP advertisement from %s.\n",
 531                                                 mac_to_str(rx.eh.ether_shost));
 532                                 status = 1;
 533                                 goto out;
 534                         case NMRP_C_CONF_REQ:
 535                                 msg_mkconfack(&tx.msg, ipconf.addr.s_addr, ipconf.mask.s_addr, region);
 536                                 expect = NMRP_C_TFTP_UL_REQ;
 537
 538                                 printf("Received configuration request from %s.\n",
 539                                                 mac_to_str(rx.eh.ether_shost));
 540
 541                                 memcpy(tx.eh.ether_dhost, rx.eh.ether_shost, 6);
 542
 543                                 printf("Sending configuration: %s, netmask %s.\n",
 544                                                 args->ipaddr, args->ipmask);
 545
 546                                 if (ethsock_arp_add(sock, rx.eh.ether_shost, ipconf.addr.s_addr, &arp_undo) != 0) {
 547                                         goto out;
 548                                 }
 549
 550                                 break;
 551                         case NMRP_C_TFTP_UL_REQ:
 552                                 if (!upload_ok) {
 553                                         if (++ulreqs > 5) {
 554                                                 printf("Bailing out after %d upload requests.\n",
 555                                                                 ulreqs);
 556                                                 tx.msg.code = NMRP_C_CLOSE_REQ;
 557                                                 break;
 558                                         }
 559                                 } else {
 560                                         if (verbosity) {
 561                                                 printf("Ignoring extra upload request.\n");
 562                                         }
 563                                         ethsock_set_timeout(sock, args->ul_timeout);
 564                                         tx.msg.code = NMRP_C_KEEP_ALIVE_REQ;
 565                                         break;
 566                                 }
 567
 568                                 filename = msg_filename(&rx.msg);
 569                                 if (filename) {
 570                                         if (!args->file_remote) {
 571                                                 args->file_remote = filename;
 572                                         }
 573                                         printf("Received upload request: filename '%s'.\n", filename);
 574                                 } else if (!args->file_remote) {
 575                                         args->file_remote = args->file_local;
 576                                         printf("Received upload request with empty filename.\n");
 577                                 }
 578
 579                                 status = 0;
 580
 581                                 if (args->tftpcmd) {
 582                                         printf("Executing '%s' ... \n", args->tftpcmd);
 583                                         setenv("IP", inet_ntoa(ipconf.addr), 1);
 584                                         setenv("PORT", lltostr(args->port, 10), 1);
 585                                         setenv("MAC", mac_to_str(rx.eh.ether_shost), 1);
 586                                         setenv("NETMASK", inet_ntoa(ipconf.mask), 1);
 587                                         //setenv("FILENAME", args->file_remote ? args->file_remote : "", 1);
 588                                         status = system(args->tftpcmd);
 589                                 }
 590
 591                                 if (!status && args->file_local) {
 592                                         if (!autoip) {
 593                                                 status = is_valid_ip(sock, &ipconf.addr, &ipconf.mask);
 594                                                 if (status < 0) {
 595                                                         goto out;
 596                                                 } else if (!status) {
 597                                                         printf("IP address of %s has changed. Please assign a "
 598                                                                         "static ip to the interface.\n", args->intf);
 599                                                         tx.msg.code = NMRP_C_CLOSE_REQ;
 600                                                         break;
 601                                                 }
 602                                         }
 603
 604                                         if (verbosity) {
 605                                                 printf("Using remote filename '%s'.\n",
 606                                                                 args->file_remote);
 607                                         }
 608
 609                                         if (!strcmp(args->file_local, "-")) {
 610                                                 printf("Uploading from stdin ... ");
 611                                         } else {
 612                                                 printf("Uploading %s ... ", leafname(args->file_local));
 613                                         }
 614                                         fflush(stdout);
 615                                         if (!(status = tftp_put(args))) {
 616                                                 printf("OK\n");
 617                                         }
 618
 619                                 }
 620
 621                                 if (!status) {
 622                                         printf("Waiting for remote to respond.\n");
 623                                         upload_ok = 1;
 624                                         ethsock_set_timeout(sock, args->ul_timeout);
 625                                         tx.msg.code = NMRP_C_KEEP_ALIVE_REQ;
 626                                         expect = NMRP_C_NONE;
 627                                 } else if (status == -2) {
 628                                         expect = NMRP_C_TFTP_UL_REQ;
 629                                 } else {
 630                                         goto out;
 631                                 }
 632
 633                                 break;
 634                         case NMRP_C_KEEP_ALIVE_REQ:
 635                                 tx.msg.code = NMRP_C_KEEP_ALIVE_ACK;
 636                                 ethsock_set_timeout(sock, args->ul_timeout);
 637                                 printf("Received keep-alive request.\n");
 638                                 break;
 639                         case NMRP_C_CLOSE_REQ:
 640                                 tx.msg.code = NMRP_C_CLOSE_ACK;
 641                                 break;
 642                         case NMRP_C_CLOSE_ACK:
 643                                 status = 0;
 644                                 goto out;
 645                         default:
 646                                 fprintf(stderr, "Unknown message code 0x%02x!\n",
 647                                                 rx.msg.code);
 648                                 msg_dump(&rx.msg);
 649                 }
 650
 651                 if (tx.msg.code != NMRP_C_NONE) {
 652                         if (pkt_send(sock, &tx) < 0) {
 653                                 xperror("sendto");
 654                                 goto out;
 655                         }
 656
 657                         if (tx.msg.code == NMRP_C_CLOSE_REQ) {
 658                                 goto out;
 659                         }
 660                 }
 661
 662                 if (rx.msg.code == NMRP_C_CLOSE_REQ) {
 663                         printf("Remote finished. Closing connection.\n");
 664                         break;
 665                 }
 666
 667                 status = pkt_recv(sock, &rx);
 668                 if (status) {
 669                         if (status == 2) {
 670                                 fprintf(stderr, "Timeout while waiting for %s.\n",
 671                                                 msg_code_str(expect));
 672                         }
 673                         goto out;
 674                 }
 675
 676                 ethsock_set_timeout(sock, args->rx_timeout);
 677
 678         }
 679
 680         if (!g_interrupted) {
 681                 status = 0;
 682                 if (ulreqs) {
 683                         printf("Reboot your device now.\n");
 684                 } else {
 685                         printf("No upload request received.\n");
 686                 }
 687         }
 688
 689 out:
 690         signal(SIGINT, sigh_orig);
 691         ethsock_arp_del(sock, &arp_undo);
 692         ethsock_ip_del(sock, &ip_undo);
 693         ethsock_close(sock);
 694         return status;
 695 }