main.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 <unistd.h>
  21 #include <getopt.h>
  22 #include <stdlib.h>
  23 #include <stdio.h>
  24 #include "nmrpd.h"
  25
  26 int verbosity = 0;
  27
  28 void usage(FILE *fp)
  29 {
  30         fprintf(fp,
  31                         "Usage: nmrpflash [OPTIONS...]\n"
  32                         "\n"
  33                         "Options (-i, and -f or -c are mandatory):\n"
  34                         " -a <ipaddr>     IP address to assign to target device\n"
  35                         " -A <ipaddr>     IP address to assign to selected interface\n"
  36                         " -B              Blind mode (don't wait for response packets)\n"
  37                         " -c <command>    Command to run before (or instead of) TFTP upload\n"
  38                         " -f <firmware>   Firmware file\n"
  39                         " -F <filename>   Remote filename to use during TFTP upload\n"
  40                         " -i <interface>  Network interface directly connected to device\n"
  41                         " -m <mac>        MAC address of target device (xx:xx:xx:xx:xx:xx)\n"
  42                         " -M <netmask>    Subnet mask to assign to target device\n"
  43                         " -t <timeout>    Timeout (in milliseconds) for NMRP packets\n"
  44                         " -T <timeout>    Time (seconds) to wait after successfull TFTP upload\n"
  45                         " -p <port>       Port to use for TFTP upload\n"
  46 #ifdef NMRPFLASH_SET_REGION
  47                         " -R <region>     Set device region (NA, WW, GR, PR, RU, BZ, IN, KO, JP)\n"
  48 #endif
  49 #ifdef NMRPFLASH_TFTP_TEST
  50                         " -U              Test TFTP upload\n"
  51 #endif
  52                         " -v              Be verbose\n"
  53                         " -V              Print version and exit\n"
  54                         " -L              List network interfaces\n"
  55                         " -h              Show this screen\n"
  56                         "\n"
  57                         "Example: (run as "
  58 #ifndef NMRPFLASH_WINDOWS
  59                         "root"
  60 #else
  61                         "administrator"
  62 #endif
  63                         ")\n\n"
  64 #ifndef NMRPFLASH_WINDOWS
  65                         "# nmrpflash -i eth0 -f firmware.bin\n"
  66 #else
  67                         "C:\\> nmrpflash.exe -i net0 -f firmware.bin\n"
  68 #endif
  69                         "\n"
  70                         "When using -c, the environment variables IP, PORT, NETMASK\n"
  71                         "and MAC are set to the device IP address, TFTP port, subnet\n"
  72                         "mask and MAC address, respectively.\n"
  73                         "\n"
  74                         "nmrpflash %s, Copyright (C) 2016 Joseph C. Lehner\n"
  75                         "nmrpflash is free software, licensed under the GNU GPLv3.\n"
  76                         "Source code at https://github.com/jclehner/nmrpflash\n"
  77                         "\n",
  78                         NMRPFLASH_VERSION
  79           );
  80 }
  81
  82 #ifdef NMRPFLASH_WINDOWS
  83 void require_admin()
  84 {
  85         SID_IDENTIFIER_AUTHORITY auth = SECURITY_NT_AUTHORITY;
  86         PSID group = NULL;
  87         BOOL admin, success = AllocateAndInitializeSid(
  88                 &auth, 2, SECURITY_BUILTIN_DOMAIN_RID, DOMAIN_ALIAS_RID_ADMINS,
  89                 0, 0, 0, 0, 0, 0, &group
  90         );
  91
  92         if (success) {
  93                 success = CheckTokenMembership(NULL, group, &admin);
  94                 FreeSid(group);
  95                 if (success) {
  96                         if (!admin) {
  97                                 fprintf(stderr, "Error: must be run as administrator\n");
  98                                 exit(1);
  99                         } else {
 100                                 return;
 101                         }
 102                 }
 103         }
 104
 105         fprintf(stderr, "Warning: failed to check administrator privileges\n");
 106 }
 107
 108 void show_exit_prompt()
 109 {
 110         DWORD pid;
 111         HWND win = GetConsoleWindow();
 112         if (!win || !GetWindowThreadProcessId(win, &pid)) {
 113                 return;
 114         }
 115
 116         if (GetCurrentProcessId() == pid) {
 117                 printf("Press any key to exit\n");
 118                 getch();
 119         }
 120 }
 121 #else
 122 void require_admin()
 123 {
 124         if (getuid() != 0) {
 125                 fprintf(stderr, "Error: must be run as root\n");
 126                 exit(1);
 127         }
 128 }
 129 #endif
 130
 131 int main(int argc, char **argv)
 132 {
 133         int c, val, max;
 134         bool list = false, have_dest_mac = false;
 135         struct nmrpd_args args = {
 136                 .rx_timeout = 200 * 1000,
 137                 .ul_timeout = 5 * 60 * 1000,
 138                 .tftpcmd = NULL,
 139                 .file_local = NULL,
 140                 .file_remote = NULL,
 141                 .ipaddr_intf = NULL,
 142                 .ipaddr = NULL,
 143                 .ipmask = "255.255.255.0",
 144                 .intf = NULL,
 145                 .mac = "ff:ff:ff:ff:ff:ff",
 146                 .op = NMRP_UPLOAD_FW,
 147                 .port = 69,
 148                 .region = NULL,
 149                 .blind = false,
 150         };
 151 #ifdef NMRPFLASH_WINDOWS
 152         char *newpath = NULL;
 153         char *oldpath = NULL;
 154         char *windir = NULL;
 155         WSADATA wsa;
 156
 157         atexit(&show_exit_prompt);
 158
 159         val = WSAStartup(MAKEWORD(2, 2), &wsa);
 160         if (val != 0) {
 161                 win_perror2("WSAStartup", val);
 162                 return 1;
 163         }
 164
 165
 166 #ifndef _WIN64
 167         // This dirty hack works around the WOW64 file system redirector[1], which would prevent
 168         // us from calling programs residing in %windir%\System32 when running on a 64bit system
 169         // (since nmrpflash is currently shipped as 32bit only).
 170         //
 171         // [1] https://msdn.microsoft.com/en-us/library/windows/desktop/aa384187(v=vs.85).aspx
 172
 173         oldpath = getenv("PATH");
 174         windir = getenv("WINDIR");
 175         if (oldpath && windir) {
 176                 newpath = malloc(strlen(oldpath) + strlen(windir) + 32);
 177                 sprintf(newpath, "%s;%s\\Sysnative", oldpath, windir);
 178                 SetEnvironmentVariable("PATH", newpath);
 179                 free(newpath);
 180         }
 181 #endif
 182 #endif
 183
 184         opterr = 0;
 185
 186         while ((c = getopt(argc, argv, "a:A:Bc:f:F:i:m:M:p:R:t:T:hLVvU")) != -1) {
 187                 max = 0x7fffffff;
 188                 switch (c) {
 189                         case 'a':
 190                                 args.ipaddr = optarg;
 191                                 break;
 192                         case 'A':
 193                                 args.ipaddr_intf = optarg;
 194                                 break;
 195                         case 'B':
 196                                 args.blind = true;
 197                                 break;
 198                         case 'c':
 199                                 args.tftpcmd = optarg;
 200                                 break;
 201                         case 'f':
 202                                 args.file_local = optarg;
 203                                 break;
 204                         case 'F':
 205                                 args.file_remote = optarg;
 206                                 break;
 207                         case 'i':
 208                                 args.intf = optarg;
 209                                 break;
 210                         case 'm':
 211                                 args.mac = optarg;
 212                                 have_dest_mac = true;
 213                                 break;
 214                         case 'M':
 215                                 args.ipmask = optarg;
 216                                 break;
 217 #ifdef NMRPFLASH_SET_REGION
 218                         case 'R':
 219                                 args.region = optarg;
 220                                 break;
 221 #endif
 222                         case 'p':
 223                         case 'T':
 224                         case 't':
 225                                 if (c == 'p') {
 226                                         max = 0xffff;
 227                                 }
 228
 229                                 val = atoi(optarg);
 230                                 if (val <= 0 || val > max) {
 231                                         fprintf(stderr, "Invalid numeric value for -%c.\n", c);
 232                                         return 1;
 233                                 }
 234
 235                                 if (c == 'p') {
 236                                         args.port = val;
 237                                 } else if (c == 't') {
 238                                         args.rx_timeout = val * 1000;
 239                                 } else if (c == 'T') {
 240                                         args.ul_timeout = val * 1000;
 241                                 }
 242
 243                                 break;
 244                         case 'V':
 245                                 printf("nmrpflash %s\n", NMRPFLASH_VERSION);
 246                                 val = 0;
 247                                 goto out;
 248                         case 'v':
 249                                 ++verbosity;
 250                                 break;
 251                         case 'L':
 252                                 list = true;
 253                                 break;
 254                         case 'h':
 255                                 usage(stdout);
 256                                 val = 0;
 257                                 goto out;
 258 #ifdef NMRPFLASH_TFTP_TEST
 259                         case 'U':
 260                                 if (args.ipaddr && args.file_local) {
 261                                         val = tftp_put(&args);
 262                                         goto out;
 263                                 }
 264                                 /* fall through */
 265 #endif
 266                         default:
 267                                 usage(stderr);
 268                                 val = 1;
 269                                 goto out;
 270                 }
 271         }
 272
 273         if (args.ipaddr_intf && !args.ipaddr) {
 274                 fprintf(stderr, "Error: cannot use -A <ipaddr> without using -a <ipaddr>.\n");
 275                 return 1;
 276         }
 277
 278         if (args.blind && !have_dest_mac) {
 279                 fprintf(stderr, "Error: use of -B requires -m <mac>.\n");
 280                 return 1;
 281         }
 282
 283 #ifndef NMRPFLASH_FUZZ
 284         if (!list && ((!args.file_local && !args.tftpcmd) || !args.intf)) {
 285                 usage(stderr);
 286                 return 1;
 287         }
 288
 289         if (!list) {
 290                 require_admin();
 291         }
 292 #endif
 293         val = !list ? nmrp_do(&args) : ethsock_list_all();
 294
 295 out:
 296 #ifdef NMRPFLASH_WINDOWS
 297         WSACleanup();
 298 #endif
 299         return val;
 300 }