instance.c

   1 #include <sys/resource.h>
   2 #include <sys/types.h>
   3 #include <sys/socket.h>
   4 #include <net/if.h>
   5 #include <unistd.h>
   6
   7 #include "procd.h"
   8 #include "service.h"
   9 #include "instance.h"
  10
  11 enum {
  12         INSTANCE_ATTR_COMMAND,
  13         INSTANCE_ATTR_ENV,
  14         INSTANCE_ATTR_DATA,
  15         INSTANCE_ATTR_NETDEV,
  16         INSTANCE_ATTR_NICE,
  17         __INSTANCE_ATTR_MAX
  18 };
  19
  20 static const struct blobmsg_policy instance_attr[__INSTANCE_ATTR_MAX] = {
  21         [INSTANCE_ATTR_COMMAND] = { "command", BLOBMSG_TYPE_ARRAY },
  22         [INSTANCE_ATTR_ENV] = { "env", BLOBMSG_TYPE_TABLE },
  23         [INSTANCE_ATTR_DATA] = { "data", BLOBMSG_TYPE_TABLE },
  24         [INSTANCE_ATTR_NETDEV] = { "netdev", BLOBMSG_TYPE_ARRAY },
  25         [INSTANCE_ATTR_NICE] = { "nice", BLOBMSG_TYPE_INT32 },
  26 };
  27
  28 struct instance_netdev {
  29         struct blobmsg_list_node node;
  30         int ifindex;
  31 };
  32
  33 static void
  34 instance_run(struct service_instance *in)
  35 {
  36         struct blobmsg_list_node *var;
  37         struct blob_attr *cur;
  38         char **argv;
  39         int argc = 1; /* NULL terminated */
  40         int rem;
  41
  42         if (in->nice)
  43                 setpriority(PRIO_PROCESS, 0, in->nice);
  44
  45         blobmsg_for_each_attr(cur, in->command, rem)
  46                 argc++;
  47
  48         blobmsg_list_for_each(&in->env, var)
  49                 setenv(blobmsg_name(var->data), blobmsg_data(var->data), 1);
  50
  51         argv = alloca(sizeof(char *) * argc);
  52         argc = 0;
  53
  54         blobmsg_for_each_attr(cur, in->command, rem)
  55                 argv[argc++] = blobmsg_data(cur);
  56
  57         argv[argc] = NULL;
  58         execvp(argv[0], argv);
  59         exit(127);
  60 }
  61
  62 void
  63 instance_start(struct service_instance *in)
  64 {
  65         int pid;
  66
  67         if (in->proc.pending)
  68                 return;
  69
  70         in->restart = false;
  71         if (!in->valid)
  72                 return;
  73
  74         pid = fork();
  75         if (pid < 0)
  76                 return;
  77
  78         if (!pid) {
  79                 instance_run(in);
  80                 return;
  81         }
  82
  83         DPRINTF("Started instance %s::%s\n", in->srv->name, in->name);
  84         in->proc.pid = pid;
  85         uloop_process_add(&in->proc);
  86 }
  87
  88 static void
  89 instance_timeout(struct uloop_timeout *t)
  90 {
  91         struct service_instance *in;
  92
  93         in = container_of(t, struct service_instance, timeout);
  94         kill(in->proc.pid, SIGKILL);
  95         uloop_process_delete(&in->proc);
  96         in->proc.cb(&in->proc, -1);
  97 }
  98
  99 static void
 100 instance_exit(struct uloop_process *p, int ret)
 101 {
 102         struct service_instance *in;
 103
 104         in = container_of(p, struct service_instance, proc);
 105         DPRINTF("Instance %s::%s exit with error code %d\n", in->srv->name, in->name, ret);
 106         uloop_timeout_cancel(&in->timeout);
 107         if (in->restart)
 108                 instance_start(in);
 109 }
 110
 111 void
 112 instance_stop(struct service_instance *in, bool restart)
 113 {
 114         if (!in->proc.pending)
 115                 return;
 116
 117         kill(in->proc.pid, SIGTERM);
 118 }
 119
 120 static bool
 121 instance_config_changed(struct service_instance *in, struct service_instance *in_new)
 122 {
 123         if (!in->valid)
 124                 return true;
 125
 126         if (!blob_attr_equal(in->command, in_new->command))
 127                 return true;
 128
 129         if (!blobmsg_list_equal(&in->env, &in_new->env))
 130                 return true;
 131
 132         if (!blobmsg_list_equal(&in->data, &in_new->data))
 133                 return true;
 134
 135         if (!blobmsg_list_equal(&in->netdev, &in_new->netdev))
 136                 return true;
 137
 138         if (in->nice != in_new->nice)
 139                 return true;
 140
 141         return false;
 142 }
 143
 144 static bool
 145 instance_netdev_cmp(struct blobmsg_list_node *l1, struct blobmsg_list_node *l2)
 146 {
 147         struct instance_netdev *n1 = container_of(l1, struct instance_netdev, node);
 148         struct instance_netdev *n2 = container_of(l2, struct instance_netdev, node);
 149
 150         return n1->ifindex == n2->ifindex;
 151 }
 152
 153 static void
 154 instance_netdev_update(struct blobmsg_list_node *l)
 155 {
 156         struct instance_netdev *n = container_of(l, struct instance_netdev, node);
 157
 158         n->ifindex = if_nametoindex(n->node.avl.key);
 159 }
 160
 161 static bool
 162 instance_config_parse(struct service_instance *in)
 163 {
 164         struct blob_attr *tb[__INSTANCE_ATTR_MAX];
 165         struct blob_attr *cur, *cur2;
 166         int argc = 0;
 167         int rem;
 168
 169         blobmsg_parse(instance_attr, __INSTANCE_ATTR_MAX, tb,
 170                 blobmsg_data(in->config), blobmsg_data_len(in->config));
 171
 172         cur = tb[INSTANCE_ATTR_COMMAND];
 173         if (!cur)
 174                 return false;
 175
 176         if (!blobmsg_check_attr_list(cur, BLOBMSG_TYPE_STRING))
 177                 return false;
 178
 179         blobmsg_for_each_attr(cur2, cur, rem) {
 180                 argc++;
 181                 break;
 182         }
 183         if (!argc)
 184                 return false;
 185
 186         in->command = cur;
 187
 188         if ((cur = tb[INSTANCE_ATTR_NICE])) {
 189                 in->nice = (int8_t) blobmsg_get_u32(cur);
 190                 if (in->nice < -20 || in->nice > 20)
 191                         return false;
 192         }
 193
 194         if ((cur = tb[INSTANCE_ATTR_ENV])) {
 195                 if (!blobmsg_check_attr_list(cur, BLOBMSG_TYPE_STRING))
 196                         return false;
 197
 198                 blobmsg_list_fill(&in->env, blobmsg_data(cur), blobmsg_data_len(cur), false);
 199         }
 200
 201         if ((cur = tb[INSTANCE_ATTR_DATA])) {
 202                 if (!blobmsg_check_attr_list(cur, BLOBMSG_TYPE_STRING))
 203                         return false;
 204
 205                 blobmsg_list_fill(&in->data, blobmsg_data(cur), blobmsg_data_len(cur), false);
 206         }
 207
 208         if ((cur = tb[INSTANCE_ATTR_NETDEV])) {
 209                 struct blobmsg_list_node *ndev;
 210
 211                 if (!blobmsg_check_attr_list(cur, BLOBMSG_TYPE_STRING))
 212                         return false;
 213
 214                 blobmsg_list_fill(&in->netdev, blobmsg_data(cur), blobmsg_data_len(cur), true);
 215                 blobmsg_list_for_each(&in->netdev, ndev)
 216                         instance_netdev_update(ndev);
 217         }
 218
 219         return true;
 220 }
 221
 222 static void
 223 instance_config_cleanup(struct service_instance *in)
 224 {
 225         blobmsg_list_free(&in->env);
 226         blobmsg_list_free(&in->data);
 227         blobmsg_list_free(&in->netdev);
 228 }
 229
 230 static void
 231 instance_config_move(struct service_instance *in, struct service_instance *in_src)
 232 {
 233         instance_config_cleanup(in);
 234         blobmsg_list_move(&in->env, &in_src->env);
 235         blobmsg_list_move(&in->data, &in_src->data);
 236         blobmsg_list_move(&in->netdev, &in_src->netdev);
 237         in->command = in_src->command;
 238         in->name = in_src->name;
 239         in->node.avl.key = in_src->node.avl.key;
 240
 241         free(in->config);
 242         in->config = in_src->config;
 243         in_src->config = NULL;
 244 }
 245
 246 bool
 247 instance_update(struct service_instance *in, struct service_instance *in_new)
 248 {
 249         bool changed = instance_config_changed(in, in_new);
 250
 251         if (!changed)
 252                 return false;
 253
 254         in->restart = true;
 255         instance_stop(in, true);
 256         instance_config_move(in, in_new);
 257         return true;
 258 }
 259
 260 void
 261 instance_free(struct service_instance *in)
 262 {
 263         uloop_process_delete(&in->proc);
 264         uloop_timeout_cancel(&in->timeout);
 265         instance_config_cleanup(in);
 266         free(in->config);
 267         free(in);
 268 }
 269
 270 void
 271 instance_init(struct service_instance *in, struct service *s, struct blob_attr *config)
 272 {
 273         config = blob_memdup(config);
 274         in->srv = s;
 275         in->name = blobmsg_name(config);
 276         in->config = config;
 277         in->timeout.cb = instance_timeout;
 278         in->proc.cb = instance_exit;
 279
 280         blobmsg_list_init(&in->netdev, struct instance_netdev, node, instance_netdev_cmp);
 281         blobmsg_list_simple_init(&in->env);
 282         blobmsg_list_simple_init(&in->data);
 283         in->valid = instance_config_parse(in);
 284 }
 285
 286 void instance_dump(struct blob_buf *b, struct service_instance *in)
 287 {
 288         void *i;
 289
 290         i = blobmsg_open_table(b, in->name);
 291         blobmsg_add_u8(b, "running", in->proc.pending);
 292         if (in->proc.pending)
 293                 blobmsg_add_u32(b, "pid", in->proc.pid);
 294         blobmsg_add_blob(b, in->command);
 295         blobmsg_close_table(b, i);
 296 }