git.m6w6.name Git - awesomized/libmemcached/blob - libmemcached/memcached_connect.c

   1 #include "common.h"
   2 #include <netdb.h>
   3 #include <poll.h>
   4 #include <sys/time.h>
   5
   6 static memcached_return set_hostinfo(memcached_server_st *server)
   7 {
   8   struct addrinfo *ai;
   9   struct addrinfo hints;
  10   int e;
  11   char str_port[NI_MAXSERV];
  12
  13   sprintf(str_port, "%u", server->port);
  14
  15   memset(&hints, 0, sizeof(hints));
  16
  17  // hints.ai_family= AF_INET;
  18   if (server->type == MEMCACHED_CONNECTION_UDP)
  19   {
  20     hints.ai_protocol= IPPROTO_UDP;
  21     hints.ai_socktype= SOCK_DGRAM;
  22   }
  23   else
  24   {
  25     hints.ai_socktype= SOCK_STREAM;
  26     hints.ai_protocol= IPPROTO_TCP;
  27   }
  28
  29   e= getaddrinfo(server->hostname, str_port, &hints, &ai);
  30   if (e != 0)
  31   {
  32     WATCHPOINT_STRING(server->hostname);
  33     WATCHPOINT_STRING(gai_strerror(e));
  34     return MEMCACHED_HOST_LOOKUP_FAILURE;
  35   }
  36
  37   if (server->address_info)
  38   {
  39     freeaddrinfo(server->address_info);
  40     server->address_info= NULL;
  41   }
  42   server->address_info= ai;
  43
  44   return MEMCACHED_SUCCESS;
  45 }
  46
  47 static memcached_return set_socket_options(memcached_server_st *ptr)
  48 {
  49   WATCHPOINT_ASSERT(ptr->fd != -1);
  50
  51   if (ptr->type == MEMCACHED_CONNECTION_UDP)
  52     return MEMCACHED_SUCCESS;
  53
  54 #ifdef HAVE_SNDTIMEO
  55   if (ptr->root->snd_timeout)
  56   {
  57     int error;
  58     struct timeval waittime;
  59
  60     waittime.tv_sec= 0;
  61     waittime.tv_usec= ptr->root->snd_timeout;
  62
  63     error= setsockopt(ptr->fd, SOL_SOCKET, SO_SNDTIMEO,
  64                       &waittime, (socklen_t)sizeof(struct timeval));
  65     WATCHPOINT_ASSERT(error == 0);
  66   }
  67 #endif
  68
  69 #ifdef HAVE_RCVTIMEO
  70   if (ptr->root->rcv_timeout)
  71   {
  72     int error;
  73     struct timeval waittime;
  74
  75     waittime.tv_sec= 0;
  76     waittime.tv_usec= ptr->root->rcv_timeout;
  77
  78     error= setsockopt(ptr->fd, SOL_SOCKET, SO_RCVTIMEO,
  79                       &waittime, (socklen_t)sizeof(struct timeval));
  80     WATCHPOINT_ASSERT(error == 0);
  81   }
  82 #endif
  83
  84   {
  85     int error;
  86     struct linger linger;
  87
  88     linger.l_onoff= 1;
  89     linger.l_linger= MEMCACHED_DEFAULT_TIMEOUT;
  90     error= setsockopt(ptr->fd, SOL_SOCKET, SO_LINGER,
  91                       &linger, (socklen_t)sizeof(struct linger));
  92     WATCHPOINT_ASSERT(error == 0);
  93   }
  94
  95   if (ptr->root->flags & MEM_TCP_NODELAY)
  96   {
  97     int flag= 1;
  98     int error;
  99
 100     error= setsockopt(ptr->fd, IPPROTO_TCP, TCP_NODELAY,
 101                       &flag, (socklen_t)sizeof(int));
 102     WATCHPOINT_ASSERT(error == 0);
 103   }
 104
 105   if (ptr->root->send_size)
 106   {
 107     int error;
 108
 109     error= setsockopt(ptr->fd, SOL_SOCKET, SO_SNDBUF,
 110                       &ptr->root->send_size, (socklen_t)sizeof(int));
 111     WATCHPOINT_ASSERT(error == 0);
 112   }
 113
 114   if (ptr->root->recv_size)
 115   {
 116     int error;
 117
 118     error= setsockopt(ptr->fd, SOL_SOCKET, SO_RCVBUF,
 119                       &ptr->root->recv_size, (socklen_t)sizeof(int));
 120     WATCHPOINT_ASSERT(error == 0);
 121   }
 122
 123   /* For the moment, not getting a nonblocking mode will not be fatal */
 124   if (ptr->root->flags & MEM_NO_BLOCK)
 125   {
 126     int flags;
 127
 128     flags= fcntl(ptr->fd, F_GETFL, 0);
 129     unlikely (flags != -1)
 130     {
 131       (void)fcntl(ptr->fd, F_SETFL, flags | O_NONBLOCK);
 132     }
 133   }
 134
 135   return MEMCACHED_SUCCESS;
 136 }
 137
 138 static memcached_return unix_socket_connect(memcached_server_st *ptr)
 139 {
 140   struct sockaddr_un servAddr;
 141   socklen_t addrlen;
 142
 143   if (ptr->fd == -1)
 144   {
 145     if ((ptr->fd= socket(AF_UNIX, SOCK_STREAM, 0)) < 0)
 146     {
 147       ptr->cached_errno= errno;
 148       return MEMCACHED_CONNECTION_SOCKET_CREATE_FAILURE;
 149     }
 150
 151     memset(&servAddr, 0, sizeof (struct sockaddr_un));
 152     servAddr.sun_family= AF_UNIX;
 153     strcpy(servAddr.sun_path, ptr->hostname); /* Copy filename */
 154
 155     addrlen= strlen(servAddr.sun_path) + sizeof(servAddr.sun_family);
 156
 157 test_connect:
 158     if (connect(ptr->fd,
 159                 (struct sockaddr *)&servAddr,
 160                 sizeof(servAddr)) < 0)
 161     {
 162       switch (errno) {
 163       case EINPROGRESS:
 164       case EALREADY:
 165       case EINTR:
 166         goto test_connect;
 167       case EISCONN: /* We were spinning waiting on connect */
 168         break;
 169       default:
 170         WATCHPOINT_ERRNO(errno);
 171         ptr->cached_errno= errno;
 172         return MEMCACHED_ERRNO;
 173       }
 174     }
 175   }
 176
 177   WATCHPOINT_ASSERT(ptr->fd != -1);
 178   return MEMCACHED_SUCCESS;
 179 }
 180
 181 static memcached_return network_connect(memcached_server_st *ptr)
 182 {
 183   if (ptr->fd == -1)
 184   {
 185     struct addrinfo *use;
 186
 187     if (ptr->root->server_failure_limit != 0)
 188     {
 189       if (ptr->server_failure_counter >= ptr->root->server_failure_limit)
 190       {
 191           memcached_server_remove(ptr);
 192           return MEMCACHED_FAILURE;
 193       }
 194     }
 195
 196     if (ptr->sockaddr_inited ||
 197         (!(ptr->root->flags & MEM_USE_CACHE_LOOKUPS)))
 198     {
 199       memcached_return rc;
 200
 201       rc= set_hostinfo(ptr);
 202       if (rc != MEMCACHED_SUCCESS)
 203         return rc;
 204       ptr->sockaddr_inited= true;
 205     }
 206
 207     use= ptr->address_info;
 208     /* Create the socket */
 209     while (use != NULL)
 210     {
 211       /* Memcache server does not support IPV6 in udp mode, so skip if not ipv4 */
 212       if (ptr->type == MEMCACHED_CONNECTION_UDP && use->ai_family != AF_INET) {
 213         use= use->ai_next;
 214         continue;
 215       }
 216
 217       if ((ptr->fd= socket(use->ai_family,
 218                            use->ai_socktype,
 219                            use->ai_protocol)) < 0)
 220       {
 221         ptr->cached_errno= errno;
 222         WATCHPOINT_ERRNO(errno);
 223         return MEMCACHED_CONNECTION_SOCKET_CREATE_FAILURE;
 224       }
 225
 226       (void)set_socket_options(ptr);
 227
 228       int flags;
 229       if (ptr->root->connect_timeout)
 230       {
 231         flags= fcntl(ptr->fd, F_GETFL, 0);
 232         if (flags != -1 && !(flags & O_NONBLOCK))
 233           (void)fcntl(ptr->fd, F_SETFL, flags | O_NONBLOCK);
 234       }
 235
 236       /* connect to server */
 237       while (ptr->fd != -1 &&
 238              connect(ptr->fd, use->ai_addr, use->ai_addrlen) < 0)
 239       {
 240         ptr->cached_errno= errno;
 241         if (errno == EINPROGRESS || /* nonblocking mode - first return, */
 242             errno == EALREADY) /* nonblocking mode - subsequent returns */
 243         {
 244           struct pollfd fds[1] = { [0].fd = ptr->fd, [0].events = POLLOUT };
 245           int error= poll(fds, 1, ptr->root->connect_timeout);
 246
 247           if (error != 1 || fds[0].revents & POLLERR)
 248           {
 249             if (fds[0].revents & POLLERR)
 250             {
 251               int err;
 252               int len = sizeof (err);
 253               (void)getsockopt(ptr->fd, SOL_SOCKET, SO_ERROR, &err, &len);
 254               ptr->cached_errno= errno;
 255             }
 256
 257             (void)close(ptr->fd);
 258             ptr->fd= -1;
 259           }
 260         }
 261         else if (errno == EISCONN) /* we are connected :-) */
 262         {
 263           break;
 264         }
 265         else if (errno != EINTR)
 266         {
 267           (void)close(ptr->fd);
 268           ptr->fd= -1;
 269           break;
 270         }
 271       }
 272
 273       if (ptr->fd != -1)
 274       {
 275         /* restore flags */
 276         if (ptr->root->connect_timeout && (flags & O_NONBLOCK) == 0)
 277           (void)fcntl(ptr->fd, F_SETFL, flags & ~O_NONBLOCK);
 278
 279         WATCHPOINT_ASSERT(ptr->cursor_active == 0);
 280         ptr->server_failure_counter= 0;
 281         return MEMCACHED_SUCCESS;
 282       }
 283       use = use->ai_next;
 284     }
 285   }
 286
 287   if (ptr->fd == -1)
 288   {
 289     /* Failed to connect. schedule next retry */
 290     if (ptr->root->retry_timeout)
 291     {
 292       struct timeval next_time;
 293
 294       if (gettimeofday(&next_time, NULL) == 0)
 295         ptr->next_retry= next_time.tv_sec + ptr->root->retry_timeout;
 296     }
 297     ptr->server_failure_counter+= 1;
 298     return MEMCACHED_ERRNO; /* The last error should be from connect() */
 299   }
 300
 301   ptr->server_failure_counter= 0;
 302   return MEMCACHED_SUCCESS; /* The last error should be from connect() */
 303 }
 304
 305
 306 memcached_return memcached_connect(memcached_server_st *ptr)
 307 {
 308   memcached_return rc= MEMCACHED_NO_SERVERS;
 309   LIBMEMCACHED_MEMCACHED_CONNECT_START();
 310
 311   if (ptr->root->retry_timeout)
 312   {
 313     struct timeval next_time;
 314
 315     gettimeofday(&next_time, NULL);
 316     if (next_time.tv_sec < ptr->next_retry)
 317       return MEMCACHED_TIMEOUT;
 318   }
 319   /* We need to clean up the multi startup piece */
 320   switch (ptr->type)
 321   {
 322   case MEMCACHED_CONNECTION_UNKNOWN:
 323     WATCHPOINT_ASSERT(0);
 324     rc= MEMCACHED_NOT_SUPPORTED;
 325     break;
 326   case MEMCACHED_CONNECTION_UDP:
 327   case MEMCACHED_CONNECTION_TCP:
 328     rc= network_connect(ptr);
 329     break;
 330   case MEMCACHED_CONNECTION_UNIX_SOCKET:
 331     rc= unix_socket_connect(ptr);
 332     break;
 333   default:
 334     WATCHPOINT_ASSERT(0);
 335   }
 336
 337   LIBMEMCACHED_MEMCACHED_CONNECT_END();
 338
 339   return rc;
 340 }