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      1 /*	$NetBSD: unix_dgram_connect.c,v 1.4 2025/02/25 19:15:52 christos Exp $	*/
      2 
      3 /*++
      4 /* NAME
      5 /*	unix_dgram_connect 3
      6 /* SUMMARY
      7 /*	connect to UNIX-domain datagram server
      8 /* SYNOPSIS
      9 /*	#include <connect.h>
     10 /*
     11 /*	int	unix_dgram_connect(
     12 /*	const char *path,
     13 /*	int	block_mode)
     14 /* DESCRIPTION
     15 /*	unix_dgram_connect() connects to the specified UNIX-domain
     16 /*	datagram server, and returns the resulting file descriptor.
     17 /*
     18 /*	Arguments:
     19 /* .IP path
     20 /*	Null-terminated string with connection destination.`
     21 /* .IP block_mode
     22 /*	Either NON_BLOCKING for a non-blocking socket, or BLOCKING for
     23 /*	blocking mode.
     24 /* DIAGNOSTICS
     25 /*	Fatal errors: path too large, can't create socket.
     26 /*
     27 /*	Other errors result in a -1 result value, with errno indicating
     28 /*	why the service is unavailable.
     29 /* .sp
     30 /*	ENOENT: the named socket does not exist.
     31 /* .sp
     32 /*	ECONNREFUSED: the named socket is not open.
     33 /* LICENSE
     34 /* .ad
     35 /* .fi
     36 /*	The Secure Mailer license must be distributed with this software.
     37 /* AUTHOR(S)
     38 /*	Wietse Venema
     39 /*	Google, Inc.
     40 /*	111 8th Avenue
     41 /*	New York, NY 10011, USA
     42 /*--*/
     43 
     44  /*
     45   * System library.
     46   */
     47 #include <sys_defs.h>
     48 #include <sys/socket.h>
     49 #include <sys/un.h>
     50 #include <unistd.h>
     51 #include <string.h>
     52 
     53  /*
     54   * Utility library.
     55   */
     56 #include <msg.h>
     57 #include <connect.h>
     58 #include <iostuff.h>
     59 
     60 /* unix_dgram_connect - connect to UNIX-domain datagram service */
     61 
     62 int     unix_dgram_connect(const char *path, int block_mode)
     63 {
     64     const char myname[] = "unix_dgram_connect";
     65 
     66 #undef sun
     67     struct sockaddr_un sun;
     68     ssize_t path_len;
     69     int     sock;
     70 
     71     /*
     72      * Translate address information to internal form.
     73      */
     74     if ((path_len = strlen(path)) >= sizeof(sun.sun_path))
     75 	msg_fatal("%s: unix-domain name too long: %s", myname, path);
     76     memset((void *) &sun, 0, sizeof(sun));
     77     sun.sun_family = AF_UNIX;
     78 #ifdef HAS_SUN_LEN
     79     sun.sun_len = path_len + 1;
     80 #endif
     81     memcpy(sun.sun_path, path, path_len + 1);
     82 
     83     /*
     84      * Create a client socket.
     85      */
     86     if ((sock = socket(AF_UNIX, SOCK_DGRAM, 0)) < 0)
     87 	msg_fatal("%s: socket: %m", myname);
     88     if (connect(sock, (struct sockaddr *) &sun, sizeof(sun)) < 0) {
     89 	close(sock);
     90 	return (-1);
     91     }
     92     non_blocking(sock, block_mode);
     93     return (sock);
     94 }
     95