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

   1 #include "common.h"
   2
   3 static memcached_return set_hostinfo(memcached_server_st *server)
   4 {
   5   struct addrinfo *ai;
   6   struct addrinfo hints;
   7   int e;
   8   char str_port[NI_MAXSERV];
   9
  10   sprintf(str_port, "%u", server->port);
  11
  12   memset(&hints, 0, sizeof(hints));
  13
  14   hints.ai_family= AF_INET;
  15   if (server->type == MEMCACHED_CONNECTION_UDP)
  16   {
  17     hints.ai_protocol= IPPROTO_UDP;
  18     hints.ai_socktype= SOCK_DGRAM;
  19   }
  20   else
  21   {
  22     hints.ai_socktype= SOCK_STREAM;
  23     hints.ai_protocol= IPPROTO_TCP;
  24   }
  25
  26   e= getaddrinfo(server->hostname, str_port, &hints, &ai);
  27   if (e != 0)
  28   {
  29     WATCHPOINT_STRING(server->hostname);
  30     WATCHPOINT_STRING(gai_strerror(e));
  31     return MEMCACHED_HOST_LOOKUP_FAILURE;
  32   }
  33
  34   if (server->address_info)
  35     freeaddrinfo(server->address_info);
  36   server->address_info= ai;
  37
  38   return MEMCACHED_SUCCESS;
  39 }
  40
  41 static memcached_return set_socket_options(memcached_server_st *ptr)
  42 {
  43   if (ptr->type == MEMCACHED_CONNECTION_UDP)
  44     return MEMCACHED_SUCCESS;
  45
  46   if (ptr->root->flags & MEM_NO_BLOCK)
  47   {
  48     int error;
  49     struct linger linger;
  50     struct timeval waittime;
  51
  52     waittime.tv_sec= 10;
  53     waittime.tv_usec= 0;
  54
  55     linger.l_onoff= 1;
  56     linger.l_linger= MEMCACHED_DEFAULT_TIMEOUT;
  57     error= setsockopt(ptr->fd, SOL_SOCKET, SO_LINGER,
  58                       &linger, (socklen_t)sizeof(struct linger));
  59     WATCHPOINT_ASSERT(error == 0);
  60
  61     error= setsockopt(ptr->fd, SOL_SOCKET, SO_SNDTIMEO,
  62                       &waittime, (socklen_t)sizeof(struct timeval));
  63     WATCHPOINT_ASSERT(error == 0);
  64
  65     error= setsockopt(ptr->fd, SOL_SOCKET, SO_RCVTIMEO,
  66                       &waittime, (socklen_t)sizeof(struct timeval));
  67     WATCHPOINT_ASSERT(error == 0);
  68   }
  69
  70   if (ptr->root->flags & MEM_TCP_NODELAY)
  71   {
  72     int flag= 1;
  73     int error;
  74
  75     error= setsockopt(ptr->fd, IPPROTO_TCP, TCP_NODELAY,
  76                       &flag, (socklen_t)sizeof(int));
  77     WATCHPOINT_ASSERT(error == 0);
  78   }
  79
  80   if (ptr->root->send_size)
  81   {
  82     int error;
  83
  84     error= setsockopt(ptr->fd, SOL_SOCKET, SO_SNDBUF,
  85                       &ptr->root->send_size, (socklen_t)sizeof(int));
  86     WATCHPOINT_ASSERT(error == 0);
  87   }
  88
  89   if (ptr->root->recv_size)
  90   {
  91     int error;
  92
  93     error= setsockopt(ptr->fd, SOL_SOCKET, SO_SNDBUF,
  94                       &ptr->root->recv_size, (socklen_t)sizeof(int));
  95     WATCHPOINT_ASSERT(error == 0);
  96   }
  97
  98   /* For the moment, not getting a nonblocking mode will not be fatal */
  99   if (ptr->root->flags & MEM_NO_BLOCK)
 100   {
 101     int flags;
 102
 103     flags= fcntl(ptr->fd, F_GETFL, 0);
 104     if (flags != -1)
 105     {
 106       (void)fcntl(ptr->fd, F_SETFL, flags | O_NONBLOCK);
 107     }
 108   }
 109
 110   return MEMCACHED_SUCCESS;
 111 }
 112
 113 static memcached_return unix_socket_connect(memcached_server_st *ptr)
 114 {
 115   struct sockaddr_un servAddr;
 116   socklen_t addrlen;
 117
 118   if (ptr->fd == -1)
 119   {
 120     if ((ptr->fd= socket(AF_UNIX, SOCK_STREAM, 0)) < 0)
 121     {
 122       ptr->cached_errno= errno;
 123       return MEMCACHED_CONNECTION_SOCKET_CREATE_FAILURE;
 124     }
 125
 126     memset(&servAddr, 0, sizeof (struct sockaddr_un));
 127     servAddr.sun_family= AF_UNIX;
 128     strcpy(servAddr.sun_path, ptr->hostname); /* Copy filename */
 129
 130     addrlen= strlen(servAddr.sun_path) + sizeof(servAddr.sun_family);
 131
 132 test_connect:
 133     if (connect(ptr->fd,
 134                 (struct sockaddr *)&servAddr,
 135                 sizeof(servAddr)) < 0)
 136     {
 137       switch (errno) {
 138         /* We are spinning waiting on connect */
 139       case EALREADY:
 140       case EINPROGRESS:
 141       case EINTR:
 142         goto test_connect;
 143       case EISCONN: /* We were spinning waiting on connect */
 144         break;
 145       default:
 146         WATCHPOINT_ERRNO(errno);
 147         ptr->cached_errno= errno;
 148         return MEMCACHED_ERRNO;
 149       }
 150     }
 151   }
 152   return MEMCACHED_SUCCESS;
 153 }
 154
 155 static memcached_return network_connect(memcached_server_st *ptr)
 156 {
 157   if (ptr->fd == -1)
 158   {
 159     struct addrinfo *use;
 160
 161     /* Old connection junk still is in the structure */
 162     WATCHPOINT_ASSERT(ptr->cursor_active == 0);
 163
 164     if (ptr->sockaddr_inited == MEMCACHED_NOT_ALLOCATED ||
 165         (!(ptr->root->flags & MEM_USE_CACHE_LOOKUPS)))
 166     {
 167       memcached_return rc;
 168
 169       rc= set_hostinfo(ptr);
 170       if (rc != MEMCACHED_SUCCESS)
 171         return rc;
 172       ptr->sockaddr_inited= MEMCACHED_ALLOCATED;
 173     }
 174
 175     use= ptr->address_info;
 176     /* Create the socket */
 177     while (use != NULL)
 178     {
 179       if ((ptr->fd= socket(use->ai_family,
 180                            use->ai_socktype,
 181                            use->ai_protocol)) < 0)
 182       {
 183         ptr->cached_errno= errno;
 184         WATCHPOINT_ERRNO(errno);
 185         return MEMCACHED_CONNECTION_SOCKET_CREATE_FAILURE;
 186       }
 187
 188       (void)set_socket_options(ptr);
 189
 190       /* connect to server */
 191 test_connect:
 192       if (connect(ptr->fd,
 193                   use->ai_addr,
 194                   use->ai_addrlen) < 0)
 195       {
 196         switch (errno) {
 197           /* We are spinning waiting on connect */
 198         case EALREADY:
 199         case EINPROGRESS:
 200         case EINTR:
 201           goto test_connect;
 202         case EISCONN: /* We were spinning waiting on connect */
 203           break;
 204         default:
 205           ptr->cached_errno= errno;
 206           WATCHPOINT_ERRNO(ptr->cached_errno);
 207           close(ptr->fd);
 208           ptr->fd= -1;
 209         }
 210       }
 211       else
 212       {
 213         WATCHPOINT_ASSERT(ptr->cursor_active == 0);
 214         return MEMCACHED_SUCCESS;
 215       }
 216       use = use->ai_next;
 217     }
 218   }
 219
 220   if (ptr->fd == -1)
 221     return MEMCACHED_ERRNO; /* The last error should be from connect() */
 222
 223   return MEMCACHED_SUCCESS; /* The last error should be from connect() */
 224 }
 225
 226
 227 memcached_return memcached_connect(memcached_server_st *ptr)
 228 {
 229   memcached_return rc= MEMCACHED_NO_SERVERS;
 230   LIBMEMCACHED_MEMCACHED_CONNECT_START();
 231
 232   /* We need to clean up the multi startup piece */
 233   switch (ptr->type)
 234   {
 235   case MEMCACHED_CONNECTION_UNKNOWN:
 236     WATCHPOINT_ASSERT(0);
 237     rc= MEMCACHED_NOT_SUPPORTED;
 238     break;
 239   case MEMCACHED_CONNECTION_UDP:
 240   case MEMCACHED_CONNECTION_TCP:
 241     rc= network_connect(ptr);
 242     break;
 243   case MEMCACHED_CONNECTION_UNIX_SOCKET:
 244     rc= unix_socket_connect(ptr);
 245     break;
 246   default:
 247     WATCHPOINT_ASSERT(0);
 248   }
 249
 250   if (rc != MEMCACHED_SUCCESS)
 251     WATCHPOINT_ERROR(rc);
 252
 253   LIBMEMCACHED_MEMCACHED_CONNECT_END();
 254
 255   return rc;
 256 }