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 static int
  49 rpc_errno_status(void)
  50 {
  51         switch (errno)
  52         {
  53         case EACCES:
  54                 return UBUS_STATUS_PERMISSION_DENIED;
  55
  56         case ENOTDIR:
  57                 return UBUS_STATUS_INVALID_ARGUMENT;
  58
  59         case ENOENT:
  60                 return UBUS_STATUS_NOT_FOUND;
  61
  62         case EINVAL:
  63                 return UBUS_STATUS_INVALID_ARGUMENT;
  64
  65         default:
  66                 return UBUS_STATUS_UNKNOWN_ERROR;
  67         }
  68 }
  69
  70 static int
  71 rpc_cgi_password_set(struct ubus_context *ctx, struct ubus_object *obj,
  72                        struct ubus_request_data *req, const char *method,
  73                        struct blob_attr *msg)
  74 {
  75         pid_t pid;
  76         int fd, fds[2];
  77         struct stat s;
  78         struct blob_attr *tb[__RPC_P_MAX];
  79         ssize_t n;
  80         int ret;
  81
  82         blobmsg_parse(rpc_password_policy, __RPC_P_MAX, tb,
  83                       blob_data(msg), blob_len(msg));
  84
  85         if (!tb[RPC_P_USER] || !tb[RPC_P_PASSWORD])
  86                 return UBUS_STATUS_INVALID_ARGUMENT;
  87
  88         if (stat("/usr/bin/passwd", &s))
  89                 return UBUS_STATUS_NOT_FOUND;
  90
  91         if (!(s.st_mode & S_IXUSR))
  92                 return UBUS_STATUS_PERMISSION_DENIED;
  93
  94         if (pipe(fds))
  95                 return rpc_errno_status();
  96
  97         switch ((pid = fork()))
  98         {
  99         case -1:
 100                 close(fds[0]);
 101                 close(fds[1]);
 102                 return rpc_errno_status();
 103
 104         case 0:
 105                 uloop_done();
 106
 107                 dup2(fds[0], 0);
 108                 close(fds[0]);
 109                 close(fds[1]);
 110
 111                 if ((fd = open("/dev/null", O_RDWR)) > -1)
 112                 {
 113                         dup2(fd, 1);
 114                         dup2(fd, 2);
 115                         close(fd);
 116                 }
 117
 118                 ret = chdir("/");
 119                 if (ret < 0)
 120                         return rpc_errno_status();
 121
 122                 if (execl("/usr/bin/passwd", "/usr/bin/passwd",
 123                           blobmsg_data(tb[RPC_P_USER]), NULL))
 124                         return rpc_errno_status();
 125
 126         default:
 127                 close(fds[0]);
 128
 129                 n = write(fds[1], blobmsg_data(tb[RPC_P_PASSWORD]),
 130                               blobmsg_data_len(tb[RPC_P_PASSWORD]) - 1);
 131                 if (n < 0)
 132                         return rpc_errno_status();
 133
 134                 n = write(fds[1], "\n", 1);
 135                 if (n < 0)
 136                         return rpc_errno_status();
 137
 138                 usleep(100 * 1000);
 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                 n = write(fds[1], "\n", 1);
 145                 if (n < 0)
 146                         return rpc_errno_status();
 147
 148                 close(fds[1]);
 149
 150                 waitpid(pid, NULL, 0);
 151
 152                 return 0;
 153         }
 154 }
 155
 156 static int
 157 rpc_sys_packagelist(struct ubus_context *ctx, struct ubus_object *obj,
 158                 struct ubus_request_data *req, const char *method,
 159                 struct blob_attr *msg)
 160 {
 161         struct blob_buf buf = { 0 };
 162         char var[256], pkg[128], ver[128];
 163         char *tmp, *p1, *p2, *p3;
 164         void *tbl;
 165
 166         FILE *f = fopen("/usr/lib/opkg/status", "r");
 167         if (!f)
 168                 return UBUS_STATUS_NOT_FOUND;
 169
 170         blob_buf_init(&buf, 0);
 171         tbl = blobmsg_open_table(&buf, "packages");
 172         pkg[0] = ver[0] = '\0';
 173
 174         while(fgets(var, sizeof(var), f)) {
 175                 p1 = strchr(var, ' ');
 176                 p2 = p3 = NULL;
 177                 if (!p1)
 178                         goto procstr;
 179
 180                 *p1++ = '\0';
 181                 p2 = strchr(p1, ' ');
 182                 if (!p2) {
 183                         tmp = strchr(p1, '\n');
 184                         if (tmp)
 185                                 *tmp = '\0';
 186                         goto procstr;
 187                 }
 188
 189                 *p2++ = '\0';
 190                 p3 = strchr(p2, ' ');
 191                 if (!p3) {
 192                         tmp = strchr(p2, '\n');
 193                         if (tmp)
 194                                 *tmp = '\0';
 195                         goto procstr;
 196                 }
 197
 198                 *p3++ = '\0';
 199                 tmp = strchr(p3, '\n');
 200                 if (tmp)
 201                         *tmp = '\0';
 202
 203 procstr:
 204                 if (!p1)
 205                         continue;
 206
 207                 if (!strcmp(var, "Package:")) {
 208                         strncpy(pkg, p1, sizeof(pkg));
 209                         continue;
 210                 }
 211
 212                 if (!strcmp(var, "Version:")) {
 213                         strncpy(ver, p1, sizeof(ver));
 214                         continue;
 215                 }
 216
 217                 if (p2 && p3 &&
 218                     !strcmp(var, "Status:") &&
 219                     !strcmp(p1, "install") &&
 220                     !strcmp(p2, "user") &&
 221                     !strcmp(p3, "installed") && pkg[0] && ver[0]) {
 222                         blobmsg_add_string(&buf, pkg, ver);
 223                         pkg[0] = ver[0] = '\0';
 224                 }
 225         }
 226
 227         blobmsg_close_table(&buf, tbl);
 228         ubus_send_reply(ctx, req, buf.head);
 229         blob_buf_free(&buf);
 230         fclose(f);
 231
 232         return 0;
 233 }
 234
 235 static int
 236 rpc_sys_upgrade_test(struct ubus_context *ctx, struct ubus_object *obj,
 237                        struct ubus_request_data *req, const char *method,
 238                        struct blob_attr *msg)
 239 {
 240         const char *cmd[4] = { "sysupgrade", "--test", "/tmp/firmware.bin", NULL };
 241         return ops->exec(cmd, NULL, NULL, NULL, NULL, NULL, ctx, req);
 242 }
 243
 244 static int
 245 rpc_sys_upgrade_start(struct ubus_context *ctx, struct ubus_object *obj,
 246                         struct ubus_request_data *req, const char *method,
 247                         struct blob_attr *msg)
 248 {
 249         struct blob_attr *tb[__RPC_UPGRADE_MAX];
 250         char * const cmd[4] = { "/sbin/sysupgrade", "-n", "/tmp/firmware.bin", NULL };
 251         char * const cmd_keep[3] = { "/sbin/sysupgrade", "/tmp/firmware.bin", NULL };
 252         char * const * c = cmd;
 253
 254         blobmsg_parse(rpc_upgrade_policy, __RPC_UPGRADE_MAX, tb,
 255                       blob_data(msg), blob_len(msg));
 256
 257         if (tb[RPC_UPGRADE_KEEP] && blobmsg_get_bool(tb[RPC_UPGRADE_KEEP]))
 258                 c = cmd_keep;
 259
 260         if (!fork()) {
 261                 /* wait for the RPC call to complete */
 262                 sleep(2);
 263                 return execv(c[0], c);
 264         }
 265
 266         return 0;
 267 }
 268
 269 static int
 270 rpc_sys_upgrade_clean(struct ubus_context *ctx, struct ubus_object *obj,
 271                         struct ubus_request_data *req, const char *method,
 272                         struct blob_attr *msg)
 273 {
 274         if (unlink("/tmp/firmware.bin"))
 275                 return rpc_errno_status();
 276
 277         return 0;
 278 }
 279
 280 static int
 281 rpc_sys_factory(struct ubus_context *ctx, struct ubus_object *obj,
 282                  struct ubus_request_data *req, const char *method,
 283                  struct blob_attr *msg)
 284 {
 285         char * const cmd[4] = { "/sbin/jffs2reset", "-y", "-r", NULL };
 286
 287         if (!fork()) {
 288                 /* wait for the RPC call to complete */
 289                 sleep(2);
 290                 return execv(cmd[0], cmd);
 291         }
 292
 293         return 0;
 294 }
 295
 296 static int
 297 rpc_sys_reboot(struct ubus_context *ctx, struct ubus_object *obj,
 298                  struct ubus_request_data *req, const char *method,
 299                  struct blob_attr *msg)
 300 {
 301         if (!fork()) {
 302                 sync();
 303                 sleep(2);
 304                 reboot(RB_AUTOBOOT);
 305                 while (1)
 306                         ;
 307         }
 308
 309         return 0;
 310 }
 311
 312 static int
 313 rpc_sys_api_init(const struct rpc_daemon_ops *o, struct ubus_context *ctx)
 314 {
 315         static const struct ubus_method sys_methods[] = {
 316                 UBUS_METHOD_NOARG("packagelist", rpc_sys_packagelist),
 317                 UBUS_METHOD("password_set", rpc_cgi_password_set, rpc_password_policy),
 318                 UBUS_METHOD_NOARG("upgrade_test", rpc_sys_upgrade_test),
 319                 UBUS_METHOD("upgrade_start",      rpc_sys_upgrade_start,
 320                                                   rpc_upgrade_policy),
 321                 UBUS_METHOD_NOARG("upgrade_clean", rpc_sys_upgrade_clean),
 322                 UBUS_METHOD_NOARG("factory", rpc_sys_factory),
 323                 UBUS_METHOD_NOARG("reboot", rpc_sys_reboot),
 324         };
 325
 326         static struct ubus_object_type sys_type =
 327                 UBUS_OBJECT_TYPE("luci-rpc-sys", sys_methods);
 328
 329         static struct ubus_object obj = {
 330                 .name = "rpc-sys",
 331                 .type = &sys_type,
 332                 .methods = sys_methods,
 333                 .n_methods = ARRAY_SIZE(sys_methods),
 334         };
 335
 336         ops = o;
 337
 338         return ubus_add_object(ctx, &obj);
 339 }
 340
 341 struct rpc_plugin rpc_plugin = {
 342         .init = rpc_sys_api_init
 343 };