external/ibm-public/postfix/dist/src/util/unix_connect.c

   1 /*      $NetBSD$        */
   2
   3 /*++
   4 /* NAME
   5 /*      unix_connect 3
   6 /* SUMMARY
   7 /*      connect to UNIX-domain listener
   8 /* SYNOPSIS
   9 /*      #include <connect.h>
  10 /*
  11 /*      int     unix_connect(addr, block_mode, timeout)
  12 /*      const char *addr;
  13 /*      int     block_mode;
  14 /*      int     timeout;
  15 /* DESCRIPTION
  16 /*      unix_connect() connects to a listener in the UNIX domain at the
  17 /*      specified address, and returns the resulting file descriptor.
  18 /*
  19 /*      Arguments:
  20 /* .IP addr
  21 /*      Null-terminated string with connection destination.
  22 /* .IP block_mode
  23 /*      Either NON_BLOCKING for a non-blocking socket, or BLOCKING for
  24 /*      blocking mode.
  25 /* .IP timeout
  26 /*      Bounds the number of seconds that the operation may take. Specify
  27 /*      a value <= 0 to disable the time limit.
  28 /* DIAGNOSTICS
  29 /*      The result is -1 in case the connection could not be made.
  30 /*      Fatal errors: other system call failures.
  31 /* LICENSE
  32 /* .ad
  33 /* .fi
  34 /*      The Secure Mailer license must be distributed with this software.
  35 /* AUTHOR(S)
  36 /*      Wietse Venema
  37 /*      IBM T.J. Watson Research
  38 /*      P.O. Box 704
  39 /*      Yorktown Heights, NY 10598, USA
  40 /*--*/
  41
  42 /* System interfaces. */
  43
  44 #include <sys_defs.h>
  45 #include <sys/socket.h>
  46 #include <sys/un.h>
  47 #include <string.h>
  48 #include <unistd.h>
  49 #include <errno.h>
  50
  51 /* Utility library. */
  52
  53 #include "msg.h"
  54 #include "iostuff.h"
  55 #include "sane_connect.h"
  56 #include "connect.h"
  57 #include "timed_connect.h"
  58
  59 /* unix_connect - connect to UNIX-domain listener */
  60
  61 int     unix_connect(const char *addr, int block_mode, int timeout)
  62 {
  63 #undef sun
  64     struct sockaddr_un sun;
  65     int     len = strlen(addr);
  66     int     sock;
  67
  68     /*
  69      * Translate address information to internal form.
  70      */
  71     if (len >= (int) sizeof(sun.sun_path))
  72         msg_fatal("unix-domain name too long: %s", addr);
  73     memset((char *) &sun, 0, sizeof(sun));
  74     sun.sun_family = AF_UNIX;
  75 #ifdef HAS_SUN_LEN
  76     sun.sun_len = len + 1;
  77 #endif
  78     memcpy(sun.sun_path, addr, len + 1);
  79
  80     /*
  81      * Create a client socket.
  82      */
  83     if ((sock = socket(AF_UNIX, SOCK_STREAM, 0)) < 0)
  84         return (-1);
  85
  86     /*
  87      * Timed connect.
  88      */
  89     if (timeout > 0) {
  90         non_blocking(sock, NON_BLOCKING);
  91         if (timed_connect(sock, (struct sockaddr *) & sun, sizeof(sun), timeout) < 0) {
  92             close(sock);
  93             return (-1);
  94         }
  95         if (block_mode != NON_BLOCKING)
  96             non_blocking(sock, block_mode);
  97         return (sock);
  98     }
  99
 100     /*
 101      * Maybe block until connected.
 102      */
 103     else {
 104         non_blocking(sock, block_mode);
 105         if (sane_connect(sock, (struct sockaddr *) & sun, sizeof(sun)) < 0
 106             && errno != EINPROGRESS) {
 107             close(sock);
 108             return (-1);
 109         }
 110         return (sock);
 111     }
 112 }