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 NMRP_MAX_OPT_SIZE 12
  34 #define NMRP_MAX_OPT_NUM 3
  35
  36 #define NMRP_OPT_NEXT(x) ((struct nmrp_opt*)(((char*)x) + x->len))
  37
  38 #define ETH_P_NMRP 0x0912
  39 #define IP_LEN 4
  40 #define MAX_LOOP_RECV 1024
  41
  42 #ifndef PACKED
  43 #define PACKED __attribute__((__packed__))
  44 #endif
  45
  46 enum nmrp_code {
  47         NMRP_C_NONE = 0,
  48         NMRP_C_ADVERTISE = 1,
  49         NMRP_C_CONF_REQ = 2,
  50         NMRP_C_CONF_ACK = 3,
  51         NMRP_C_CLOSE_REQ = 4,
  52         NMRP_C_CLOSE_ACK = 5,
  53         NMRP_C_KEEP_ALIVE_REQ = 6,
  54         NMRP_C_KEEP_ALIVE_ACK = 7,
  55         NMRP_C_TFTP_UL_REQ = 16
  56 };
  57
  58 enum nmrp_opt_type {
  59         NMRP_O_MAGIC_NO = 0x0001,
  60         NMRP_O_DEV_IP = 0x0002,
  61         NMRP_O_DEV_REGION = 0x0004,
  62         NMRP_O_FW_UP = 0x0101,
  63         NMRP_O_ST_UP = 0x0102,
  64         NMRP_O_FILE_NAME = 0x0181
  65 };
  66
  67 struct nmrp_opt {
  68         uint16_t type;
  69         uint16_t len;
  70         union {
  71                 uint8_t magic[4];
  72                 uint16_t region;
  73                 struct {
  74                         uint8_t addr[4];
  75                         uint8_t mask[4];
  76                 } ip;
  77         } val;
  78 } PACKED;
  79
  80 struct nmrp_msg {
  81         uint16_t reserved;
  82         uint8_t code;
  83         uint8_t id;
  84         uint16_t len;
  85         /* only opts[0] is valid! think of this as a char* */
  86         struct nmrp_opt opts[NMRP_MAX_OPT_NUM];
  87         /* this is NOT part of the transmitted packet */
  88         uint32_t num_opts;
  89 } PACKED;
  90
  91 struct eth_hdr {
  92         uint8_t ether_dhost[6];
  93         uint8_t ether_shost[6];
  94         uint16_t ether_type;
  95 } PACKED;
  96
  97 struct nmrp_pkt {
  98         struct eth_hdr eh;
  99         struct nmrp_msg msg;
 100 } PACKED;
 101
 102 static const char *msg_code_str(uint16_t code)
 103 {
 104 #define CASE_CODE(x) case NMRP_C_ ## x: return #x
 105         static char buf[16];
 106
 107         switch (code) {
 108                 CASE_CODE(ADVERTISE);
 109                 CASE_CODE(CONF_REQ);
 110                 CASE_CODE(CONF_ACK);
 111                 CASE_CODE(CLOSE_REQ);
 112                 CASE_CODE(CLOSE_ACK);
 113                 CASE_CODE(KEEP_ALIVE_REQ);
 114                 CASE_CODE(KEEP_ALIVE_ACK);
 115                 CASE_CODE(TFTP_UL_REQ);
 116                 default:
 117                         snprintf(buf, sizeof(buf), "%04x", code);
 118                         return buf;
 119         }
 120 #undef CASE_CODE
 121 }
 122
 123 static uint16_t to_region_code(const char *region)
 124 {
 125 #define REGION_CODE(r, c) if (!strcasecmp(region, r)) return c
 126         REGION_CODE("NA", 0x0001);
 127         REGION_CODE("WW", 0x0002);
 128         REGION_CODE("GR", 0x0003);
 129         REGION_CODE("PR", 0x0004);
 130         REGION_CODE("RU", 0x0005);
 131         REGION_CODE("BZ", 0x0006);
 132         REGION_CODE("IN", 0x0007);
 133         REGION_CODE("KO", 0x0008);
 134         REGION_CODE("JP", 0x0009);
 135 #undef REGION_CODE
 136         return 0;
 137 }
 138
 139 static void msg_dump(struct nmrp_msg *msg, int dump_opts)
 140 {
 141         struct nmrp_opt *opt;
 142         int remain_len, len, i;
 143
 144         fprintf(stderr, "res=0x%04x, code=0x%02x, id=0x%02x, len=%u",
 145                         msg->reserved, msg->code, msg->id, msg->len);
 146
 147         remain_len = msg->len - NMRP_HDR_LEN;
 148         fprintf(stderr, "%s\n", remain_len ? "" : " (no opts)");
 149
 150         if (dump_opts) {
 151                 opt = msg->opts;
 152
 153                 while (remain_len > 0) {
 154                         len = opt->len;
 155                         fprintf(stderr, "  opt type=%u, len=%u", opt->type, len);
 156                         if (len) {
 157                                 for (i = 0; i != len - NMRP_OPT_HDR_LEN; ++i) {
 158                                         if (!(i % 16)) {
 159                                                 fprintf(stderr, "\n  ");
 160                                         }
 161
 162                                         fprintf(stderr, "%02x ", ((char*)&opt->val)[i] & 0xff);
 163                                 }
 164                                 fprintf(stderr, "\n");
 165                         }
 166                         remain_len -= len;
 167                         opt = NMRP_OPT_NEXT(opt);
 168                 }
 169         }
 170 }
 171
 172 static void msg_hton(struct nmrp_msg *msg)
 173 {
 174         uint32_t i = 0;
 175         struct nmrp_opt *opt = msg->opts, *next;
 176
 177         msg->reserved = htons(msg->reserved);
 178         msg->len = htons(msg->len);
 179
 180         for (; i != msg->num_opts; ++i) {
 181                 next = NMRP_OPT_NEXT(opt);
 182                 opt->len = htons(opt->len);
 183                 opt->type = htons(opt->type);
 184                 opt = next;
 185         }
 186 }
 187
 188 static void msg_hdr_ntoh(struct nmrp_msg *msg)
 189 {
 190         msg->reserved = ntohs(msg->reserved);
 191         msg->len = ntohs(msg->len);
 192 }
 193
 194 static int msg_ntoh(struct nmrp_msg *msg)
 195 {
 196         struct nmrp_opt *opt = msg->opts;
 197         int remaining;
 198
 199         remaining = msg->len - NMRP_HDR_LEN;
 200
 201         // FIXME maximum of two options supported, maximum option
 202         // size is 12
 203         if (remaining < NMRP_MAX_OPT_NUM * NMRP_MAX_OPT_SIZE) {
 204                 while (remaining > 0) {
 205                         if (remaining < NMRP_OPT_HDR_LEN) {
 206                                 break;
 207                         }
 208
 209                         opt->type = ntohs(opt->type);
 210                         opt->len = ntohs(opt->len);
 211
 212                         if (opt->len > NMRP_MAX_OPT_SIZE) {
 213                                 break;
 214                         }
 215
 216                         remaining -= opt->len;
 217                         opt = NMRP_OPT_NEXT(opt);
 218                 }
 219
 220                 if (!remaining) {
 221                         return 0;
 222                 }
 223         }
 224
 225         fprintf(stderr, "Unexpected message format.\n");
 226         msg_dump(msg, 0);
 227         return 1;
 228 }
 229
 230 static void *msg_opt_data(struct nmrp_msg *msg, uint16_t type, uint16_t *len)
 231 {
 232         static char buf[128];
 233         struct nmrp_opt *opt = msg->opts;
 234         int remaining = msg->len - NMRP_HDR_LEN;
 235
 236         memset(buf, 0, sizeof(buf));
 237
 238         while (remaining > 0) {
 239                 if (opt->type == type) {
 240                         if (opt->len == NMRP_OPT_HDR_LEN) {
 241                                 return NULL;
 242                         }
 243                         *len = opt->len - NMRP_OPT_HDR_LEN;
 244                         memcpy(buf, &opt->val, MIN(*len, sizeof(buf)-1));
 245                         return buf;
 246                 }
 247
 248                 remaining -= opt->len;
 249                 opt = NMRP_OPT_NEXT(opt);
 250         }
 251
 252         return NULL;
 253 }
 254
 255 static void msg_opt_add(struct nmrp_msg *msg, uint16_t type, void *data,
 256                 uint16_t len)
 257 {
 258         uint32_t i = 0;
 259         struct nmrp_opt *opt = msg->opts;
 260
 261         if (len + NMRP_OPT_HDR_LEN > NMRP_MAX_OPT_SIZE
 262                         || msg->num_opts == NMRP_MAX_OPT_NUM) {
 263                 fprintf(stderr, "Invalid option - this is a bug.\n");
 264         }
 265
 266         for (; i <= msg->num_opts; ++i) {
 267                 opt = NMRP_OPT_NEXT(opt);
 268         }
 269
 270         opt->len = NMRP_OPT_HDR_LEN + len;
 271         opt->type = type;
 272
 273         if (len) {
 274                 memcpy(&opt->val, data, len);
 275         }
 276
 277         msg->len += opt->len;
 278         ++msg->num_opts;
 279 }
 280
 281 static inline void msg_init(struct nmrp_msg *msg, uint16_t code)
 282 {
 283         memset(msg, 0, sizeof(*msg));
 284         msg->len = NMRP_HDR_LEN;
 285         msg->code = code;
 286 }
 287
 288 static int pkt_send(struct ethsock *sock, struct nmrp_pkt *pkt)
 289 {
 290         size_t len = ntohs(pkt->msg.len) + sizeof(pkt->eh);
 291         return ethsock_send(sock, pkt, len);
 292 }
 293
 294 static int pkt_recv(struct ethsock *sock, struct nmrp_pkt *pkt)
 295 {
 296         ssize_t bytes, len;
 297
 298         memset(pkt, 0, sizeof(*pkt));
 299         bytes = ethsock_recv(sock, pkt, sizeof(*pkt));
 300         if (bytes < 0) {
 301                 return 1;
 302         } else if (!bytes) {
 303                 return 2;
 304         } else if (bytes < NMRP_MIN_PKT_LEN) {
 305                 fprintf(stderr, "Short packet (%d bytes)\n", (int)bytes);
 306                 return 1;
 307         }
 308
 309         msg_hdr_ntoh(&pkt->msg);
 310         len = pkt->msg.len + sizeof(pkt->eh);
 311
 312         if (bytes < len) {
 313                 fprintf(stderr, "Short packet (expected %d, got %d).\n",
 314                                 (int)len, (int)bytes);
 315                 return 1;
 316         }
 317
 318         return msg_ntoh(&pkt->msg);
 319 }
 320
 321 static int mac_parse(const char *str, uint8_t *hwaddr)
 322 {
 323         int i;
 324         unsigned data[6];
 325
 326         sscanf(str, "%02x:%02x:%02x:%02x:%02x:%02x%n",
 327                         data, data + 1, data + 2, data + 3, data + 4, data + 5, &i);
 328
 329         if (i == strlen(str)) {
 330                 for (i = 0; i != 6; ++i) {
 331                         if (data[i] > 255) {
 332                                 break;
 333                         }
 334
 335                         hwaddr[i] = data[i] & 0xff;
 336                 }
 337
 338                 if (i == 6) {
 339                         return 1;
 340                 }
 341         }
 342         return 0;
 343 }
 344
 345 struct is_valid_ip_arg
 346 {
 347         struct in_addr *ipaddr;
 348         struct in_addr *ipmask;
 349         int result;
 350 };
 351
 352 static int is_valid_ip_cb(struct ethsock_ip_callback_args *args)
 353 {
 354 #define SUBNET(x) ((x)->ipaddr->s_addr & (x)->ipmask->s_addr)
 355         struct is_valid_ip_arg *arg = args->arg;
 356         if (SUBNET(args) == SUBNET(arg)) {
 357                 arg->result = args->ipaddr->s_addr != arg->ipaddr->s_addr;
 358                 return 0;
 359         }
 360
 361         return 1;
 362 #undef SUBNET
 363 }
 364
 365 static int is_valid_ip(struct ethsock *sock, struct in_addr *ipaddr,
 366                 struct in_addr *ipmask)
 367 {
 368         int status;
 369         struct is_valid_ip_arg arg = {
 370                 .ipaddr = ipaddr,
 371                 .ipmask = ipmask,
 372                 .result = 0
 373         };
 374
 375         status = ethsock_for_each_ip(sock, is_valid_ip_cb, &arg);
 376         return status < 0 ? status : arg.result;
 377 }
 378
 379 static struct ethsock *gsock = NULL;
 380
 381 static void sigh(int sig)
 382 {
 383         printf("\n");
 384         if (gsock) {
 385                 ethsock_close(gsock);
 386         }
 387
 388         exit(1);
 389 }
 390
 391 static const char *spinner = "\\|/-";
 392
 393 int nmrp_do(struct nmrpd_args *args)
 394 {
 395         struct nmrp_pkt tx, rx;
 396         uint8_t *src, dest[6];
 397         uint16_t len, region;
 398         char *filename;
 399         time_t beg;
 400         int i, status, ulreqs, expect, upload_ok;
 401         struct ethsock *sock;
 402         void (*sigh_orig)(int);
 403         struct {
 404                 struct in_addr addr;
 405                 struct in_addr mask;
 406         } PACKED ipconf;
 407
 408         if (args->op != NMRP_UPLOAD_FW) {
 409                 fprintf(stderr, "Operation not implemented.\n");
 410                 return 1;
 411         }
 412
 413         if (!mac_parse(args->mac, dest)) {
 414                 fprintf(stderr, "Invalid MAC address '%s'.\n", args->mac);
 415                 return 1;
 416         }
 417
 418         if ((ipconf.addr.s_addr = inet_addr(args->ipaddr)) == INADDR_NONE) {
 419                 fprintf(stderr, "Invalid IP address '%s'.\n", args->ipaddr);
 420                 return 1;
 421         }
 422
 423         if ((ipconf.mask.s_addr = inet_addr(args->ipmask)) == INADDR_NONE) {
 424                 fprintf(stderr, "Invalid subnet mask '%s'.\n", args->ipmask);
 425                 return 1;
 426         }
 427
 428         if (strcmp(args->file_local, "-") && access(args->file_local, R_OK) == -1) {
 429                 fprintf(stderr, "Error accessing file '%s'.\n", args->file_local);
 430                 return 1;
 431         }
 432
 433         if (args->file_remote) {
 434                 if (!tftp_is_valid_filename(args->file_remote)) {
 435                         fprintf(stderr, "Invalid remote filename '%s'.\n",
 436                                         args->file_remote);
 437                         return 1;
 438                 }
 439         }
 440
 441         if (args->region) {
 442                 region = htons(to_region_code(args->region));
 443                 if (!region) {
 444                         fprintf(stderr, "Invalid region code '%s'.\n", args->region);
 445                         return 1;
 446                 }
 447         } else {
 448                 region = 0;
 449         }
 450
 451         status = 1;
 452
 453         sock = ethsock_create(args->intf, ETH_P_NMRP);
 454         if (!sock) {
 455                 return 1;
 456         }
 457
 458         status = is_valid_ip(sock, &ipconf.addr, &ipconf.mask);
 459         if (status <= 0) {
 460                 if (!status) {
 461                         fprintf(stderr, "Address %s/%s cannot be used on interface %s.\n",
 462                                         args->ipaddr, args->ipmask, args->intf);
 463                 }
 464                 goto out;
 465         }
 466
 467         gsock = sock;
 468         sigh_orig = signal(SIGINT, sigh);
 469
 470         if (ethsock_set_timeout(sock, args->rx_timeout)) {
 471                 goto out;
 472         }
 473
 474         src = ethsock_get_hwaddr(sock);
 475         if (!src) {
 476                 goto out;
 477         }
 478
 479         memcpy(tx.eh.ether_shost, src, 6);
 480         memcpy(tx.eh.ether_dhost, dest, 6);
 481         tx.eh.ether_type = htons(ETH_P_NMRP);
 482
 483         msg_init(&tx.msg, NMRP_C_ADVERTISE);
 484         msg_opt_add(&tx.msg, NMRP_O_MAGIC_NO, "NTGR", 4);
 485         msg_hton(&tx.msg);
 486
 487         i = 0;
 488         upload_ok = 0;
 489         beg = time(NULL);
 490
 491         while (1) {
 492                 printf("\rAdvertising NMRP server on %s ... %c",
 493                                 args->intf, spinner[i]);
 494                 fflush(stdout);
 495                 i = (i + 1) & 3;
 496
 497                 if (pkt_send(sock, &tx) < 0) {
 498                         perror("sendto");
 499                         goto out;
 500                 }
 501
 502                 status = pkt_recv(sock, &rx);
 503                 if (status == 0 && memcmp(rx.eh.ether_dhost, src, 6) == 0) {
 504                         break;
 505                 } else if (status == 1) {
 506                         printf("ERR\n");
 507                         goto out;
 508                 } else {
 509                         if ((time(NULL) - beg) >= 60) {
 510                                 printf("\nNo response after 60 seconds. Bailing out.\n");
 511                                 goto out;
 512                         }
 513                 }
 514         }
 515
 516         printf("\n");
 517
 518         expect = NMRP_C_CONF_REQ;
 519         ulreqs = 0;
 520
 521         do {
 522                 if (expect != NMRP_C_NONE && rx.msg.code != expect) {
 523                         fprintf(stderr, "Received %s while waiting for %s!\n",
 524                                         msg_code_str(rx.msg.code), msg_code_str(expect));
 525                 }
 526
 527                 msg_init(&tx.msg, NMRP_C_NONE);
 528
 529                 status = 1;
 530
 531                 switch (rx.msg.code) {
 532                         case NMRP_C_ADVERTISE:
 533                                 printf("Received NMRP advertisement from %s.\n",
 534                                                 mac_to_str(rx.eh.ether_shost));
 535                                 status = 1;
 536                                 goto out;
 537                         case NMRP_C_CONF_REQ:
 538                                 tx.msg.code = NMRP_C_CONF_ACK;
 539
 540                                 msg_opt_add(&tx.msg, NMRP_O_DEV_IP, &ipconf, 8);
 541                                 msg_opt_add(&tx.msg, NMRP_O_FW_UP, NULL, 0);
 542
 543 #ifdef NMRPFLASH_SET_REGION
 544                                 if (region) {
 545                                         msg_opt_add(&tx.msg, NMRP_O_DEV_REGION, &region, 2);
 546                                 }
 547 #endif
 548
 549                                 expect = NMRP_C_TFTP_UL_REQ;
 550
 551                                 printf("Received configuration request from %s.\n",
 552                                                 mac_to_str(rx.eh.ether_shost));
 553
 554                                 memcpy(tx.eh.ether_dhost, rx.eh.ether_shost, 6);
 555
 556                                 printf("Sending configuration: ip %s, mask %s.\n",
 557                                                 args->ipaddr, args->ipmask);
 558
 559                                 break;
 560                         case NMRP_C_TFTP_UL_REQ:
 561                                 if (!upload_ok) {
 562                                         if (++ulreqs > 5) {
 563                                                 printf("Bailing out after %d upload requests.\n",
 564                                                                 ulreqs);
 565                                                 tx.msg.code = NMRP_C_CLOSE_REQ;
 566                                                 break;
 567                                         }
 568                                 } else {
 569                                         if (verbosity) {
 570                                                 printf("Ignoring extra upload request.\n");
 571                                         }
 572                                         ethsock_set_timeout(sock, args->ul_timeout);
 573                                         tx.msg.code = NMRP_C_KEEP_ALIVE_REQ;
 574                                         break;
 575                                 }
 576
 577                                 len = 0;
 578                                 filename = msg_opt_data(&rx.msg, NMRP_O_FILE_NAME, &len);
 579                                 if (filename) {
 580                                         if (!args->file_remote) {
 581                                                 args->file_remote = filename;
 582                                         }
 583                                         printf("Received upload request: filename '%.*s'.\n",
 584                                                         len, filename);
 585                                 } else if (!args->file_remote) {
 586                                         args->file_remote = args->file_local;
 587                                         printf("Received upload request with empty filename.\n");
 588                                 }
 589
 590                                 status = 0;
 591
 592                                 if (args->tftpcmd) {
 593                                         printf("Executing '%s' ... ", args->tftpcmd);
 594                                         fflush(stdout);
 595                                         status = system(args->tftpcmd);
 596                                         if (!status) {
 597                                                 printf("OK\n");
 598                                         } else {
 599                                                 printf("ERR\n");
 600                                         }
 601                                 }
 602
 603                                 if (!status && args->file_local) {
 604                                         status = is_valid_ip(sock, &ipconf.addr, &ipconf.mask);
 605                                         if (status < 0) {
 606                                                 goto out;
 607                                         } else if (!status) {
 608                                                 printf("IP address of %s has changed. Please assign a "
 609                                                                 "static ip to the interface.\n", args->intf);
 610                                                 tx.msg.code = NMRP_C_CLOSE_REQ;
 611                                                 break;
 612                                         }
 613
 614                                         if (verbosity) {
 615                                                 printf("Using remote filename '%s'.\n",
 616                                                                 args->file_remote);
 617                                         }
 618
 619                                         if (!strcmp(args->file_local, "-")) {
 620                                                 printf("Uploading from stdin ... ");
 621                                         } else {
 622                                                 printf("Uploading %s ... ", leafname(args->file_local));
 623                                         }
 624                                         fflush(stdout);
 625                                         status = tftp_put(args);
 626                                 }
 627
 628                                 if (!status) {
 629                                         printf("OK\nWaiting for remote to respond.\n");
 630                                         upload_ok = 1;
 631                                         ethsock_set_timeout(sock, args->ul_timeout);
 632                                         tx.msg.code = NMRP_C_KEEP_ALIVE_REQ;
 633                                         expect = NMRP_C_NONE;
 634                                 } else if (status == -2) {
 635                                         expect = NMRP_C_TFTP_UL_REQ;
 636                                 } else {
 637                                         goto out;
 638                                 }
 639
 640                                 break;
 641                         case NMRP_C_KEEP_ALIVE_REQ:
 642                                 tx.msg.code = NMRP_C_KEEP_ALIVE_ACK;
 643                                 ethsock_set_timeout(sock, 15000);
 644                                 printf("Received keep-alive request.\n");
 645                                 break;
 646                         case NMRP_C_CLOSE_REQ:
 647                                 tx.msg.code = NMRP_C_CLOSE_ACK;
 648                                 break;
 649                         case NMRP_C_CLOSE_ACK:
 650                                 status = 0;
 651                                 goto out;
 652                         default:
 653                                 fprintf(stderr, "Unknown message code 0x%02x!\n",
 654                                                 rx.msg.code);
 655                                 msg_dump(&rx.msg, 0);
 656                 }
 657
 658                 if (tx.msg.code != NMRP_C_NONE) {
 659                         msg_hton(&tx.msg);
 660
 661                         if (pkt_send(sock, &tx) < 0) {
 662                                 perror("sendto");
 663                                 goto out;
 664                         }
 665                 }
 666
 667                 if (rx.msg.code == NMRP_C_CLOSE_REQ) {
 668                         printf("Remote finished. Closing connection.\n");
 669                         break;
 670                 }
 671
 672                 status = pkt_recv(sock, &rx);
 673                 if (status) {
 674                         if (status == 2) {
 675                                 fprintf(stderr, "Timeout while waiting for %s.\n",
 676                                                 msg_code_str(expect));
 677                         }
 678                         goto out;
 679                 }
 680
 681                 ethsock_set_timeout(sock, args->rx_timeout);
 682
 683         } while (1);
 684
 685         status = 0;
 686
 687         if (ulreqs) {
 688                 printf("Reboot your device now.\n");
 689         } else {
 690                 printf("No upload request received.\n");
 691         }
 692
 693 out:
 694         signal(SIGINT, sigh_orig);
 695         gsock = NULL;
 696         ethsock_close(sock);
 697         return status;
 698 }