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