sys.c

   1 /*
   2  * rpcd - UBUS RPC server
   3  *
   4  *   Copyright (C) 2013-2014 Jo-Philipp Wich <jow@openwrt.org>
   5  *
   6  * Permission to use, copy, modify, and/or distribute this software for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  */
  18
  19 #include <libubus.h>
  20
  21 #include <rpcd/exec.h>
  22 #include <rpcd/plugin.h>
  23 #include <rpcd/session.h>
  24 #include <sys/reboot.h>
  25
  26 static const struct rpc_daemon_ops *ops;
  27
  28 enum {
  29         RPC_P_USER,
  30         RPC_P_PASSWORD,
  31         __RPC_P_MAX
  32 };
  33
  34 static const struct blobmsg_policy rpc_password_policy[__RPC_P_MAX] = {
  35         [RPC_P_USER]     = { .name = "user",     .type = BLOBMSG_TYPE_STRING },
  36         [RPC_P_PASSWORD] = { .name = "password", .type = BLOBMSG_TYPE_STRING },
  37 };
  38
  39 enum {
  40         RPC_UPGRADE_KEEP,
  41         __RPC_UPGRADE_MAX
  42 };
  43
  44 static const struct blobmsg_policy rpc_upgrade_policy[__RPC_UPGRADE_MAX] = {
  45         [RPC_UPGRADE_KEEP] = { .name = "keep",    .type = BLOBMSG_TYPE_BOOL },
  46 };
  47
  48 enum {
  49         RPC_PACKAGELIST_ALL,
  50         __RPC_PACKAGELIST_MAX
  51 };
  52
  53 static const struct blobmsg_policy rpc_packagelist_policy[__RPC_PACKAGELIST_MAX] = {
  54         [RPC_PACKAGELIST_ALL] = { .name = "all",    .type = BLOBMSG_TYPE_BOOL },
  55 };
  56
  57 static int
  58 rpc_errno_status(void)
  59 {
  60         switch (errno)
  61         {
  62         case EACCES:
  63                 return UBUS_STATUS_PERMISSION_DENIED;
  64
  65         case ENOTDIR:
  66                 return UBUS_STATUS_INVALID_ARGUMENT;
  67
  68         case ENOENT:
  69                 return UBUS_STATUS_NOT_FOUND;
  70
  71         case EINVAL:
  72                 return UBUS_STATUS_INVALID_ARGUMENT;
  73
  74         default:
  75                 return UBUS_STATUS_UNKNOWN_ERROR;
  76         }
  77 }
  78
  79 static int
  80 rpc_cgi_password_set(struct ubus_context *ctx, struct ubus_object *obj,
  81                        struct ubus_request_data *req, const char *method,
  82                        struct blob_attr *msg)
  83 {
  84         pid_t pid;
  85         int fd, fds[2];
  86         struct stat s;
  87         struct blob_attr *tb[__RPC_P_MAX];
  88         ssize_t n;
  89         int ret;
  90         const char *const passwd = "/bin/passwd";
  91         const struct timespec ts = {0, 100 * 1000 * 1000};
  92
  93         blobmsg_parse(rpc_password_policy, __RPC_P_MAX, tb,
  94                       blob_data(msg), blob_len(msg));
  95
  96         if (!tb[RPC_P_USER] || !tb[RPC_P_PASSWORD])
  97                 return UBUS_STATUS_INVALID_ARGUMENT;
  98
  99         if (stat(passwd, &s))
 100                 return UBUS_STATUS_NOT_FOUND;
 101
 102         if (!(s.st_mode & S_IXUSR))
 103                 return UBUS_STATUS_PERMISSION_DENIED;
 104
 105         if (pipe(fds))
 106                 return rpc_errno_status();
 107
 108         switch ((pid = fork()))
 109         {
 110         case -1:
 111                 close(fds[0]);
 112                 close(fds[1]);
 113                 return rpc_errno_status();
 114
 115         case 0:
 116                 uloop_done();
 117
 118                 dup2(fds[0], 0);
 119                 close(fds[0]);
 120                 close(fds[1]);
 121
 122                 if ((fd = open("/dev/null", O_RDWR)) > -1)
 123                 {
 124                         dup2(fd, 1);
 125                         dup2(fd, 2);
 126                         close(fd);
 127                 }
 128
 129                 ret = chdir("/");
 130                 if (ret < 0)
 131                         return rpc_errno_status();
 132
 133                 if (execl(passwd, passwd,
 134                           blobmsg_data(tb[RPC_P_USER]), NULL))
 135                         return rpc_errno_status();
 136
 137         default:
 138                 close(fds[0]);
 139
 140                 n = write(fds[1], blobmsg_data(tb[RPC_P_PASSWORD]),
 141                               blobmsg_data_len(tb[RPC_P_PASSWORD]) - 1);
 142                 if (n < 0)
 143                         return rpc_errno_status();
 144
 145                 n = write(fds[1], "\n", 1);
 146                 if (n < 0)
 147                         return rpc_errno_status();
 148
 149                 nanosleep(&ts, NULL);
 150
 151                 n = write(fds[1], blobmsg_data(tb[RPC_P_PASSWORD]),
 152                               blobmsg_data_len(tb[RPC_P_PASSWORD]) - 1);
 153                 if (n < 0)
 154                         return rpc_errno_status();
 155                 n = write(fds[1], "\n", 1);
 156                 if (n < 0)
 157                         return rpc_errno_status();
 158
 159                 close(fds[1]);
 160
 161                 waitpid(pid, NULL, 0);
 162
 163                 return 0;
 164         }
 165 }
 166
 167 static int
 168 rpc_sys_packagelist(struct ubus_context *ctx, struct ubus_object *obj,
 169                 struct ubus_request_data *req, const char *method,
 170                 struct blob_attr *msg)
 171 {
 172         struct blob_attr *tb[__RPC_PACKAGELIST_MAX];
 173         int all = false;
 174         struct blob_buf buf = { 0 };
 175         char var[256], pkg[128], ver[128];
 176         char *tmp, *p1, *p2, *p3;
 177         void *tbl;
 178
 179         blobmsg_parse(rpc_packagelist_policy, __RPC_PACKAGELIST_MAX, tb,
 180                       blob_data(msg), blob_len(msg));
 181
 182         if (tb[RPC_PACKAGELIST_ALL] && blobmsg_get_bool(tb[RPC_PACKAGELIST_ALL]))
 183                 all = true;
 184
 185         FILE *f = fopen("/usr/lib/opkg/status", "r");
 186         if (!f)
 187                 return UBUS_STATUS_NOT_FOUND;
 188
 189         blob_buf_init(&buf, 0);
 190         tbl = blobmsg_open_table(&buf, "packages");
 191         pkg[0] = ver[0] = '\0';
 192
 193         while(fgets(var, sizeof(var), f)) {
 194                 p1 = strchr(var, ' ');
 195                 p2 = p3 = NULL;
 196                 if (!p1)
 197                         goto procstr;
 198
 199                 *p1++ = '\0';
 200                 p2 = strchr(p1, ' ');
 201                 if (!p2) {
 202                         tmp = strchr(p1, '\n');
 203                         if (tmp)
 204                                 *tmp = '\0';
 205                         goto procstr;
 206                 }
 207
 208                 *p2++ = '\0';
 209                 p3 = strchr(p2, ' ');
 210                 if (!p3) {
 211                         tmp = strchr(p2, '\n');
 212                         if (tmp)
 213                                 *tmp = '\0';
 214                         goto procstr;
 215                 }
 216
 217                 *p3++ = '\0';
 218                 tmp = strchr(p3, '\n');
 219                 if (tmp)
 220                         *tmp = '\0';
 221
 222 procstr:
 223                 if (!p1)
 224                         continue;
 225
 226                 if (!strcmp(var, "Package:")) {
 227                         strncpy(pkg, p1, sizeof(pkg));
 228                         continue;
 229                 }
 230
 231                 if (!strcmp(var, "Version:")) {
 232                         strncpy(ver, p1, sizeof(ver));
 233                         continue;
 234                 }
 235
 236                 if (p2 && p3 &&
 237                     !strcmp(var, "Status:") &&
 238                     !strcmp(p1, "install") &&
 239                     (all || strstr(p2, "user")) &&
 240                     !strcmp(p3, "installed") && pkg[0] && ver[0]) {
 241                         blobmsg_add_string(&buf, pkg, ver);
 242                         pkg[0] = ver[0] = '\0';
 243                 }
 244         }
 245
 246         blobmsg_close_table(&buf, tbl);
 247         ubus_send_reply(ctx, req, buf.head);
 248         blob_buf_free(&buf);
 249         fclose(f);
 250
 251         return 0;
 252 }
 253
 254 static int
 255 rpc_sys_upgrade_test(struct ubus_context *ctx, struct ubus_object *obj,
 256                        struct ubus_request_data *req, const char *method,
 257                        struct blob_attr *msg)
 258 {
 259         const char *cmd[4] = { "sysupgrade", "--test", "/tmp/firmware.bin", NULL };
 260         return ops->exec(cmd, NULL, NULL, NULL, NULL, NULL, ctx, req);
 261 }
 262
 263 static int
 264 rpc_sys_upgrade_start(struct ubus_context *ctx, struct ubus_object *obj,
 265                         struct ubus_request_data *req, const char *method,
 266                         struct blob_attr *msg)
 267 {
 268         struct blob_attr *tb[__RPC_UPGRADE_MAX];
 269         char * const cmd[4] = { "/sbin/sysupgrade", "-n", "/tmp/firmware.bin", NULL };
 270         char * const cmd_keep[3] = { "/sbin/sysupgrade", "/tmp/firmware.bin", NULL };
 271         char * const * c = cmd;
 272
 273         blobmsg_parse(rpc_upgrade_policy, __RPC_UPGRADE_MAX, tb,
 274                       blob_data(msg), blob_len(msg));
 275
 276         if (tb[RPC_UPGRADE_KEEP] && blobmsg_get_bool(tb[RPC_UPGRADE_KEEP]))
 277                 c = cmd_keep;
 278
 279         if (!fork()) {
 280                 /* wait for the RPC call to complete */
 281                 sleep(2);
 282                 return execv(c[0], c);
 283         }
 284
 285         return 0;
 286 }
 287
 288 static int
 289 rpc_sys_upgrade_clean(struct ubus_context *ctx, struct ubus_object *obj,
 290                         struct ubus_request_data *req, const char *method,
 291                         struct blob_attr *msg)
 292 {
 293         if (unlink("/tmp/firmware.bin"))
 294                 return rpc_errno_status();
 295
 296         return 0;
 297 }
 298
 299 static int
 300 rpc_sys_factory(struct ubus_context *ctx, struct ubus_object *obj,
 301                  struct ubus_request_data *req, const char *method,
 302                  struct blob_attr *msg)
 303 {
 304         char * const cmd[4] = { "/sbin/jffs2reset", "-y", "-r", NULL };
 305
 306         if (!fork()) {
 307                 /* wait for the RPC call to complete */
 308                 sleep(2);
 309                 return execv(cmd[0], cmd);
 310         }
 311
 312         return 0;
 313 }
 314
 315 static int
 316 rpc_sys_reboot(struct ubus_context *ctx, struct ubus_object *obj,
 317                  struct ubus_request_data *req, const char *method,
 318                  struct blob_attr *msg)
 319 {
 320         if (!fork()) {
 321                 sync();
 322                 sleep(2);
 323                 reboot(RB_AUTOBOOT);
 324                 while (1)
 325                         ;
 326         }
 327
 328         return 0;
 329 }
 330
 331 static int
 332 rpc_sys_api_init(const struct rpc_daemon_ops *o, struct ubus_context *ctx)
 333 {
 334         static const struct ubus_method sys_methods[] = {
 335                 UBUS_METHOD("packagelist", rpc_sys_packagelist, rpc_packagelist_policy),
 336                 UBUS_METHOD("password_set", rpc_cgi_password_set, rpc_password_policy),
 337                 UBUS_METHOD_NOARG("upgrade_test", rpc_sys_upgrade_test),
 338                 UBUS_METHOD("upgrade_start",      rpc_sys_upgrade_start,
 339                                                   rpc_upgrade_policy),
 340                 UBUS_METHOD_NOARG("upgrade_clean", rpc_sys_upgrade_clean),
 341                 UBUS_METHOD_NOARG("factory", rpc_sys_factory),
 342                 UBUS_METHOD_NOARG("reboot", rpc_sys_reboot),
 343         };
 344
 345         static struct ubus_object_type sys_type =
 346                 UBUS_OBJECT_TYPE("luci-rpc-sys", sys_methods);
 347
 348         static struct ubus_object obj = {
 349                 .name = "rpc-sys",
 350                 .type = &sys_type,
 351                 .methods = sys_methods,
 352                 .n_methods = ARRAY_SIZE(sys_methods),
 353         };
 354
 355         ops = o;
 356
 357         return ubus_add_object(ctx, &obj);
 358 }
 359
 360 struct rpc_plugin rpc_plugin = {
 361         .init = rpc_sys_api_init
 362 };