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_upgrade_test(struct ubus_context *ctx, struct ubus_object *obj,
 158                        struct ubus_request_data *req, const char *method,
 159                        struct blob_attr *msg)
 160 {
 161         const char *cmd[4] = { "sysupgrade", "--test", "/tmp/firmware.bin", NULL };
 162         return ops->exec(cmd, NULL, NULL, NULL, NULL, NULL, ctx, req);
 163 }
 164
 165 static int
 166 rpc_sys_upgrade_start(struct ubus_context *ctx, struct ubus_object *obj,
 167                         struct ubus_request_data *req, const char *method,
 168                         struct blob_attr *msg)
 169 {
 170         struct blob_attr *tb[__RPC_UPGRADE_MAX];
 171         char * const cmd[4] = { "/sbin/sysupgrade", "-n", "/tmp/firmware.bin", NULL };
 172         char * const cmd_keep[3] = { "/sbin/sysupgrade", "/tmp/firmware.bin", NULL };
 173         char * const * c = cmd;
 174
 175         blobmsg_parse(rpc_upgrade_policy, __RPC_UPGRADE_MAX, tb,
 176                       blob_data(msg), blob_len(msg));
 177
 178         if (tb[RPC_UPGRADE_KEEP] && blobmsg_get_bool(tb[RPC_UPGRADE_KEEP]))
 179                 c = cmd_keep;
 180
 181         if (!fork()) {
 182                 /* wait for the RPC call to complete */
 183                 sleep(2);
 184                 return execv(c[0], c);
 185         }
 186
 187         return 0;
 188 }
 189
 190 static int
 191 rpc_sys_upgrade_clean(struct ubus_context *ctx, struct ubus_object *obj,
 192                         struct ubus_request_data *req, const char *method,
 193                         struct blob_attr *msg)
 194 {
 195         if (unlink("/tmp/firmware.bin"))
 196                 return rpc_errno_status();
 197
 198         return 0;
 199 }
 200
 201 static int
 202 rpc_sys_factory(struct ubus_context *ctx, struct ubus_object *obj,
 203                  struct ubus_request_data *req, const char *method,
 204                  struct blob_attr *msg)
 205 {
 206         char * const cmd[4] = { "/sbin/jffs2reset", "-y", "-r", NULL };
 207
 208         if (!fork()) {
 209                 /* wait for the RPC call to complete */
 210                 sleep(2);
 211                 return execv(cmd[0], cmd);
 212         }
 213
 214         return 0;
 215 }
 216
 217 static int
 218 rpc_sys_reboot(struct ubus_context *ctx, struct ubus_object *obj,
 219                  struct ubus_request_data *req, const char *method,
 220                  struct blob_attr *msg)
 221 {
 222         if (!fork()) {
 223                 sync();
 224                 sleep(2);
 225                 reboot(RB_AUTOBOOT);
 226                 while (1)
 227                         ;
 228         }
 229
 230         return 0;
 231 }
 232
 233 static int
 234 rpc_sys_api_init(const struct rpc_daemon_ops *o, struct ubus_context *ctx)
 235 {
 236         static const struct ubus_method sys_methods[] = {
 237                 UBUS_METHOD("password_set", rpc_cgi_password_set, rpc_password_policy),
 238                 UBUS_METHOD_NOARG("upgrade_test", rpc_sys_upgrade_test),
 239                 UBUS_METHOD("upgrade_start",      rpc_sys_upgrade_start,
 240                                                   rpc_upgrade_policy),
 241                 UBUS_METHOD_NOARG("upgrade_clean", rpc_sys_upgrade_clean),
 242                 UBUS_METHOD_NOARG("factory", rpc_sys_factory),
 243                 UBUS_METHOD_NOARG("reboot", rpc_sys_reboot),
 244         };
 245
 246         static struct ubus_object_type sys_type =
 247                 UBUS_OBJECT_TYPE("luci-rpc-sys", sys_methods);
 248
 249         static struct ubus_object obj = {
 250                 .name = "rpc-sys",
 251                 .type = &sys_type,
 252                 .methods = sys_methods,
 253                 .n_methods = ARRAY_SIZE(sys_methods),
 254         };
 255
 256         ops = o;
 257
 258         return ubus_add_object(ctx, &obj);
 259 }
 260
 261 struct rpc_plugin rpc_plugin = {
 262         .init = rpc_sys_api_init
 263 };