socket.c

   1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
   2
   3 #include <sys/types.h>
   4 #include <sys/stat.h>
   5 #include <unistd.h>
   6 #include <errno.h>
   7 #include <fcntl.h>
   8
   9 #include "name.h"
  10 #include "socket.h"
  11 #include "log.h"
  12
  13 static const NameActiveState state_table[_SOCKET_STATE_MAX] = {
  14         [SOCKET_DEAD] = NAME_INACTIVE,
  15         [SOCKET_START_PRE] = NAME_ACTIVATING,
  16         [SOCKET_START_POST] = NAME_ACTIVATING,
  17         [SOCKET_LISTENING] = NAME_ACTIVE,
  18         [SOCKET_RUNNING] = NAME_ACTIVE,
  19         [SOCKET_STOP_PRE] = NAME_DEACTIVATING,
  20         [SOCKET_STOP_POST] = NAME_DEACTIVATING,
  21         [SOCKET_MAINTAINANCE] = NAME_INACTIVE,
  22 };
  23
  24 static int socket_load(Name *n) {
  25         Socket *s = SOCKET(n);
  26
  27         exec_context_defaults(&s->exec_context);
  28         s->backlog = SOMAXCONN;
  29
  30         return name_load_fragment_and_dropin(n);
  31 }
  32
  33 static const char* listen_lookup(int type) {
  34
  35         if (type == SOCK_STREAM)
  36                 return "ListenStream";
  37         else if (type == SOCK_DGRAM)
  38                 return "ListenDatagram";
  39         else if (type == SOCK_SEQPACKET)
  40                 return "ListenSequentialPacket";
  41
  42         assert_not_reached("Unkown socket type");
  43         return NULL;
  44 }
  45
  46 static void socket_dump(Name *n, FILE *f, const char *prefix) {
  47
  48         static const char* const state_table[_SOCKET_STATE_MAX] = {
  49                 [SOCKET_DEAD] = "dead",
  50                 [SOCKET_START_PRE] = "start-pre",
  51                 [SOCKET_START_POST] = "start-post",
  52                 [SOCKET_LISTENING] = "listening",
  53                 [SOCKET_RUNNING] = "running",
  54                 [SOCKET_STOP_PRE] = "stop-pre",
  55                 [SOCKET_STOP_POST] = "stop-post",
  56                 [SOCKET_MAINTAINANCE] = "maintainance"
  57         };
  58
  59         static const char* const command_table[_SOCKET_EXEC_MAX] = {
  60                 [SOCKET_EXEC_START_PRE] = "StartPre",
  61                 [SOCKET_EXEC_START_POST] = "StartPost",
  62                 [SOCKET_EXEC_STOP_PRE] = "StopPre",
  63                 [SOCKET_EXEC_STOP_POST] = "StopPost"
  64         };
  65
  66         SocketExecCommand c;
  67         Socket *s = SOCKET(n);
  68         SocketPort *p;
  69
  70         assert(s);
  71
  72         fprintf(f,
  73                 "%sSocket State: %s\n"
  74                 "%sBindIPv6Only: %s\n"
  75                 "%sBacklog: %u\n",
  76                 prefix, state_table[s->state],
  77                 prefix, yes_no(s->bind_ipv6_only),
  78                 prefix, s->backlog);
  79
  80         LIST_FOREACH(p, s->ports) {
  81
  82                 if (p->type == SOCKET_SOCKET) {
  83                         const char *t;
  84                         int r;
  85                         char *k;
  86
  87                         if ((r = socket_address_print(&p->address, &k)) < 0)
  88                                 t = strerror(-r);
  89                         else
  90                                 t = k;
  91
  92                         fprintf(f, "%s%s: %s\n", prefix, listen_lookup(p->address.type), k);
  93                         free(k);
  94                 } else
  95                         fprintf(f, "%sListenFIFO: %s\n", prefix, p->path);
  96         }
  97
  98         exec_context_dump(&s->exec_context, f, prefix);
  99
 100         for (c = 0; c < _SOCKET_EXEC_MAX; c++) {
 101                 ExecCommand *i;
 102
 103                 LIST_FOREACH(i, s->exec_command[c])
 104                         fprintf(f, "%s%s: %s\n", prefix, command_table[c], i->path);
 105         }
 106 }
 107
 108 static void socket_set_state(Socket *s, SocketState state) {
 109         SocketState old_state;
 110         assert(s);
 111
 112         old_state = s->state;
 113         s->state = state;
 114
 115         name_notify(NAME(s), state_table[old_state], state_table[s->state]);
 116 }
 117
 118 static void close_fds(Socket *s) {
 119         SocketPort *p;
 120
 121         assert(s);
 122
 123         LIST_FOREACH(p, s->ports) {
 124                 if (p->fd < 0)
 125                         continue;
 126
 127                 close_nointr(p->fd);
 128                 p->fd = -1;
 129         }
 130 }
 131
 132 static int socket_start(Name *n) {
 133         Socket *s = SOCKET(n);
 134         SocketPort *p;
 135         int r;
 136
 137         assert(s);
 138
 139         if (s->state == SOCKET_START_PRE ||
 140             s->state == SOCKET_START_POST)
 141                 return 0;
 142
 143         if (s->state == SOCKET_LISTENING ||
 144             s->state == SOCKET_RUNNING)
 145                 return -EALREADY;
 146
 147         if (s->state == SOCKET_STOP_PRE ||
 148             s->state == SOCKET_STOP_POST)
 149                 return -EAGAIN;
 150
 151         assert(s->state == SOCKET_DEAD || s->state == SOCKET_MAINTAINANCE);
 152
 153         LIST_FOREACH(p, s->ports) {
 154
 155                 assert(p->fd < 0);
 156
 157                 if (p->type == SOCKET_SOCKET) {
 158
 159                         if ((r = socket_address_listen(&p->address, s->backlog, s->bind_ipv6_only, &p->fd)) < 0)
 160                                 goto rollback;
 161
 162                 } else {
 163                         struct stat st;
 164                         assert(p->type == SOCKET_FIFO);
 165
 166                         if (mkfifo(p->path, 0666 & ~s->exec_context.umask) < 0 && errno != EEXIST) {
 167                                 r = -errno;
 168                                 goto rollback;
 169                         }
 170
 171                         if ((p->fd = open(p->path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW)) < 0) {
 172                                 r = -errno;
 173                                 goto rollback;
 174                         }
 175
 176                         if (fstat(p->fd, &st) < 0) {
 177                                 r = -errno;
 178                                 goto rollback;
 179                         }
 180
 181                         /* FIXME verify user, access mode */
 182
 183                         if (!S_ISFIFO(st.st_mode)) {
 184                                 r = -EEXIST;
 185                                 goto rollback;
 186                         }
 187                 }
 188         }
 189
 190         socket_set_state(s, SOCKET_LISTENING);
 191
 192         return 0;
 193
 194 rollback:
 195         close_fds(s);
 196
 197         socket_set_state(s, SOCKET_MAINTAINANCE);
 198
 199         return r;
 200 }
 201
 202 static int socket_stop(Name *n) {
 203         Socket *s = SOCKET(n);
 204
 205         assert(s);
 206
 207         if (s->state == SOCKET_START_PRE ||
 208             s->state == SOCKET_START_POST)
 209                 return -EAGAIN;
 210
 211         if (s->state == SOCKET_DEAD ||
 212             s->state == SOCKET_MAINTAINANCE)
 213                 return -EALREADY;
 214
 215         if (s->state == SOCKET_STOP_PRE ||
 216             s->state == SOCKET_STOP_POST)
 217                 return 0;
 218
 219         assert(s->state == SOCKET_LISTENING || s->state == SOCKET_RUNNING);
 220
 221         close_fds(s);
 222
 223         socket_set_state(s, SOCKET_DEAD);
 224
 225         return 0;
 226 }
 227
 228 static NameActiveState socket_active_state(Name *n) {
 229         assert(n);
 230
 231         return state_table[SOCKET(n)->state];
 232 }
 233
 234 static void socket_free_hook(Name *n) {
 235         SocketExecCommand c;
 236         Socket *s = SOCKET(n);
 237         SocketPort *p;
 238
 239         assert(s);
 240
 241         while ((p = s->ports)) {
 242                 LIST_REMOVE(SocketPort, s->ports, p);
 243
 244                 if (p->fd >= 0)
 245                         close_nointr(p->fd);
 246                 free(p->path);
 247                 free(p);
 248         }
 249
 250         exec_context_free(&s->exec_context);
 251
 252         for (c = 0; c < _SOCKET_EXEC_MAX; c++)
 253                 exec_command_free_list(s->exec_command[c]);
 254
 255         if (s->service)
 256                 s->service->socket = NULL;
 257 }
 258
 259 const NameVTable socket_vtable = {
 260         .suffix = ".socket",
 261
 262         .load = socket_load,
 263         .dump = socket_dump,
 264
 265         .start = socket_start,
 266         .stop = socket_stop,
 267         .reload = NULL,
 268
 269         .active_state = socket_active_state,
 270
 271         .free_hook = socket_free_hook
 272 };