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
  92         blobmsg_parse(rpc_password_policy, __RPC_P_MAX, tb,
  93                       blob_data(msg), blob_len(msg));
  94
  95         if (!tb[RPC_P_USER] || !tb[RPC_P_PASSWORD])
  96                 return UBUS_STATUS_INVALID_ARGUMENT;
  97
  98         if (stat(passwd, &s))
  99                 return UBUS_STATUS_NOT_FOUND;
 100
 101         if (!(s.st_mode & S_IXUSR))
 102                 return UBUS_STATUS_PERMISSION_DENIED;
 103
 104         if (pipe(fds))
 105                 return rpc_errno_status();
 106
 107         switch ((pid = fork()))
 108         {
 109         case -1:
 110                 close(fds[0]);
 111                 close(fds[1]);
 112                 return rpc_errno_status();
 113
 114         case 0:
 115                 uloop_done();
 116
 117                 dup2(fds[0], 0);
 118                 close(fds[0]);
 119                 close(fds[1]);
 120
 121                 if ((fd = open("/dev/null", O_RDWR)) > -1)
 122                 {
 123                         dup2(fd, 1);
 124                         dup2(fd, 2);
 125                         close(fd);
 126                 }
 127
 128                 ret = chdir("/");
 129                 if (ret < 0)
 130                         return rpc_errno_status();
 131
 132                 if (execl(passwd, passwd,
 133                           blobmsg_data(tb[RPC_P_USER]), NULL))
 134                         return rpc_errno_status();
 135
 136         default:
 137                 close(fds[0]);
 138
 139                 n = write(fds[1], blobmsg_data(tb[RPC_P_PASSWORD]),
 140                               blobmsg_data_len(tb[RPC_P_PASSWORD]) - 1);
 141                 if (n < 0)
 142                         return rpc_errno_status();
 143
 144                 n = write(fds[1], "\n", 1);
 145                 if (n < 0)
 146                         return rpc_errno_status();
 147
 148                 usleep(100 * 1000);
 149
 150                 n = write(fds[1], blobmsg_data(tb[RPC_P_PASSWORD]),
 151                               blobmsg_data_len(tb[RPC_P_PASSWORD]) - 1);
 152                 if (n < 0)
 153                         return rpc_errno_status();
 154                 n = write(fds[1], "\n", 1);
 155                 if (n < 0)
 156                         return rpc_errno_status();
 157
 158                 close(fds[1]);
 159
 160                 waitpid(pid, NULL, 0);
 161
 162                 return 0;
 163         }
 164 }
 165
 166 static int
 167 rpc_sys_packagelist(struct ubus_context *ctx, struct ubus_object *obj,
 168                 struct ubus_request_data *req, const char *method,
 169                 struct blob_attr *msg)
 170 {
 171         struct blob_attr *tb[__RPC_PACKAGELIST_MAX];
 172         int all = false;
 173         struct blob_buf buf = { 0 };
 174         char var[256], pkg[128], ver[128];
 175         char *tmp, *p1, *p2, *p3;
 176         void *tbl;
 177
 178         blobmsg_parse(rpc_packagelist_policy, __RPC_PACKAGELIST_MAX, tb,
 179                       blob_data(msg), blob_len(msg));
 180
 181         if (tb[RPC_PACKAGELIST_ALL] && blobmsg_get_bool(tb[RPC_PACKAGELIST_ALL]))
 182                 all = true;
 183
 184         FILE *f = fopen("/usr/lib/opkg/status", "r");
 185         if (!f)
 186                 return UBUS_STATUS_NOT_FOUND;
 187
 188         blob_buf_init(&buf, 0);
 189         tbl = blobmsg_open_table(&buf, "packages");
 190         pkg[0] = ver[0] = '\0';
 191
 192         while(fgets(var, sizeof(var), f)) {
 193                 p1 = strchr(var, ' ');
 194                 p2 = p3 = NULL;
 195                 if (!p1)
 196                         goto procstr;
 197
 198                 *p1++ = '\0';
 199                 p2 = strchr(p1, ' ');
 200                 if (!p2) {
 201                         tmp = strchr(p1, '\n');
 202                         if (tmp)
 203                                 *tmp = '\0';
 204                         goto procstr;
 205                 }
 206
 207                 *p2++ = '\0';
 208                 p3 = strchr(p2, ' ');
 209                 if (!p3) {
 210                         tmp = strchr(p2, '\n');
 211                         if (tmp)
 212                                 *tmp = '\0';
 213                         goto procstr;
 214                 }
 215
 216                 *p3++ = '\0';
 217                 tmp = strchr(p3, '\n');
 218                 if (tmp)
 219                         *tmp = '\0';
 220
 221 procstr:
 222                 if (!p1)
 223                         continue;
 224
 225                 if (!strcmp(var, "Package:")) {
 226                         strncpy(pkg, p1, sizeof(pkg));
 227                         continue;
 228                 }
 229
 230                 if (!strcmp(var, "Version:")) {
 231                         strncpy(ver, p1, sizeof(ver));
 232                         continue;
 233                 }
 234
 235                 if (p2 && p3 &&
 236                     !strcmp(var, "Status:") &&
 237                     !strcmp(p1, "install") &&
 238                     (all || strstr(p2, "user")) &&
 239                     !strcmp(p3, "installed") && pkg[0] && ver[0]) {
 240                         blobmsg_add_string(&buf, pkg, ver);
 241                         pkg[0] = ver[0] = '\0';
 242                 }
 243         }
 244
 245         blobmsg_close_table(&buf, tbl);
 246         ubus_send_reply(ctx, req, buf.head);
 247         blob_buf_free(&buf);
 248         fclose(f);
 249
 250         return 0;
 251 }
 252
 253 static int
 254 rpc_sys_upgrade_test(struct ubus_context *ctx, struct ubus_object *obj,
 255                        struct ubus_request_data *req, const char *method,
 256                        struct blob_attr *msg)
 257 {
 258         const char *cmd[4] = { "sysupgrade", "--test", "/tmp/firmware.bin", NULL };
 259         return ops->exec(cmd, NULL, NULL, NULL, NULL, NULL, ctx, req);
 260 }
 261
 262 static int
 263 rpc_sys_upgrade_start(struct ubus_context *ctx, struct ubus_object *obj,
 264                         struct ubus_request_data *req, const char *method,
 265                         struct blob_attr *msg)
 266 {
 267         struct blob_attr *tb[__RPC_UPGRADE_MAX];
 268         char * const cmd[4] = { "/sbin/sysupgrade", "-n", "/tmp/firmware.bin", NULL };
 269         char * const cmd_keep[3] = { "/sbin/sysupgrade", "/tmp/firmware.bin", NULL };
 270         char * const * c = cmd;
 271
 272         blobmsg_parse(rpc_upgrade_policy, __RPC_UPGRADE_MAX, tb,
 273                       blob_data(msg), blob_len(msg));
 274
 275         if (tb[RPC_UPGRADE_KEEP] && blobmsg_get_bool(tb[RPC_UPGRADE_KEEP]))
 276                 c = cmd_keep;
 277
 278         if (!fork()) {
 279                 /* wait for the RPC call to complete */
 280                 sleep(2);
 281                 return execv(c[0], c);
 282         }
 283
 284         return 0;
 285 }
 286
 287 static int
 288 rpc_sys_upgrade_clean(struct ubus_context *ctx, struct ubus_object *obj,
 289                         struct ubus_request_data *req, const char *method,
 290                         struct blob_attr *msg)
 291 {
 292         if (unlink("/tmp/firmware.bin"))
 293                 return rpc_errno_status();
 294
 295         return 0;
 296 }
 297
 298 static int
 299 rpc_sys_factory(struct ubus_context *ctx, struct ubus_object *obj,
 300                  struct ubus_request_data *req, const char *method,
 301                  struct blob_attr *msg)
 302 {
 303         char * const cmd[4] = { "/sbin/jffs2reset", "-y", "-r", NULL };
 304
 305         if (!fork()) {
 306                 /* wait for the RPC call to complete */
 307                 sleep(2);
 308                 return execv(cmd[0], cmd);
 309         }
 310
 311         return 0;
 312 }
 313
 314 static int
 315 rpc_sys_reboot(struct ubus_context *ctx, struct ubus_object *obj,
 316                  struct ubus_request_data *req, const char *method,
 317                  struct blob_attr *msg)
 318 {
 319         if (!fork()) {
 320                 sync();
 321                 sleep(2);
 322                 reboot(RB_AUTOBOOT);
 323                 while (1)
 324                         ;
 325         }
 326
 327         return 0;
 328 }
 329
 330 static int
 331 rpc_sys_api_init(const struct rpc_daemon_ops *o, struct ubus_context *ctx)
 332 {
 333         static const struct ubus_method sys_methods[] = {
 334                 UBUS_METHOD("packagelist", rpc_sys_packagelist, rpc_packagelist_policy),
 335                 UBUS_METHOD("password_set", rpc_cgi_password_set, rpc_password_policy),
 336                 UBUS_METHOD_NOARG("upgrade_test", rpc_sys_upgrade_test),
 337                 UBUS_METHOD("upgrade_start",      rpc_sys_upgrade_start,
 338                                                   rpc_upgrade_policy),
 339                 UBUS_METHOD_NOARG("upgrade_clean", rpc_sys_upgrade_clean),
 340                 UBUS_METHOD_NOARG("factory", rpc_sys_factory),
 341                 UBUS_METHOD_NOARG("reboot", rpc_sys_reboot),
 342         };
 343
 344         static struct ubus_object_type sys_type =
 345                 UBUS_OBJECT_TYPE("luci-rpc-sys", sys_methods);
 346
 347         static struct ubus_object obj = {
 348                 .name = "rpc-sys",
 349                 .type = &sys_type,
 350                 .methods = sys_methods,
 351                 .n_methods = ARRAY_SIZE(sys_methods),
 352         };
 353
 354         ops = o;
 355
 356         return ubus_add_object(ctx, &obj);
 357 }
 358
 359 struct rpc_plugin rpc_plugin = {
 360         .init = rpc_sys_api_init
 361 };