1 /* assuan-socket-connect.c - Assuan socket based client
2 * Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
3 *
4 * This file is part of Assuan.
5 *
6 * Assuan is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU Lesser General Public License as
8 * published by the Free Software Foundation; either version 2.1 of
9 * the License, or (at your option) any later version.
10 *
11 * Assuan is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public License
17 * along with this program; if not, see <http://www.gnu.org/licenses/>.
18 */
19
20 /* Please note that this is a stripped down and modified version of
21 the orginal Assuan code from libassuan. */
22
23 #include <config.h>
24 #include <stdlib.h>
25 #include <stddef.h>
26 #include <stdio.h>
27 #include <string.h>
28 #include <errno.h>
29 #include <unistd.h>
30 #include <sys/types.h>
31 #ifndef HAVE_W32_SYSTEM
32 #include <sys/socket.h>
33 #include <sys/un.h>
34 #else
35 #include <windows.h>
36 #endif
37
38 #include "assuan-defs.h"
39
40 /* Hacks for Slowaris. */
41 #ifndef PF_LOCAL
42 # ifdef PF_UNIX
43 # define PF_LOCAL PF_UNIX
44 # else
45 # define PF_LOCAL AF_UNIX
46 # endif
47 #endif
48 #ifndef AF_LOCAL
49 # define AF_LOCAL AF_UNIX
50 #endif
51
52 #ifndef SUN_LEN
53 # define SUN_LEN(ptr) ((size_t) (((struct sockaddr_un *) 0)->sun_path) \
54 + strlen ((ptr)->sun_path))
55 #endif
56
57
58 static int
do_finish(assuan_context_t ctx)59 do_finish (assuan_context_t ctx)
60 {
61 if (ctx->inbound.fd != -1)
62 {
63 _assuan_close (ctx->inbound.fd);
64 }
65 ctx->inbound.fd = -1;
66 ctx->outbound.fd = -1;
67 return 0;
68 }
69
70 static void
do_deinit(assuan_context_t ctx)71 do_deinit (assuan_context_t ctx)
72 {
73 do_finish (ctx);
74 }
75
76
77 static ssize_t
simple_read(assuan_context_t ctx,void * buffer,size_t size)78 simple_read (assuan_context_t ctx, void *buffer, size_t size)
79 {
80 #ifndef HAVE_W32_SYSTEM
81 return read (ctx->inbound.fd, buffer, size);
82 #else
83 return recv (ctx->inbound.fd, buffer, size, 0);
84 #endif
85 }
86
87 static ssize_t
simple_write(assuan_context_t ctx,const void * buffer,size_t size)88 simple_write (assuan_context_t ctx, const void *buffer, size_t size)
89 {
90 #ifndef HAVE_W32_SYSTEM
91 return write (ctx->outbound.fd, buffer, size);
92 #else
93 return send (ctx->outbound.fd, buffer, size, 0);
94 #endif
95 }
96
97
98 /* Make a connection to the Unix domain socket NAME and return a new
99 Assuan context in CTX. SERVER_PID is currently not used but may
100 become handy in the future. */
101 assuan_error_t
assuan_socket_connect(assuan_context_t * r_ctx,const char * name,pid_t server_pid)102 assuan_socket_connect (assuan_context_t *r_ctx,
103 const char *name, pid_t server_pid)
104 {
105 static struct assuan_io io = { simple_read, simple_write };
106
107 assuan_error_t err;
108 assuan_context_t ctx;
109 int fd;
110 struct sockaddr_un srvr_addr;
111 size_t len;
112 const char *s;
113
114 if (!r_ctx || !name)
115 return ASSUAN_Invalid_Value;
116 *r_ctx = NULL;
117
118 /* We require that the name starts with a slash, so that we can
119 alter reuse this function for other socket types. To make things
120 easier we allow an optional dirver prefix. */
121 s = name;
122 if (*s && s[1] == ':')
123 s += 2;
124 if (*s != DIRSEP_C && *s != '/')
125 return ASSUAN_Invalid_Value;
126
127 if (strlen (name)+1 >= sizeof srvr_addr.sun_path)
128 return ASSUAN_Invalid_Value;
129
130 err = _assuan_new_context (&ctx);
131 if (err)
132 return err;
133 ctx->deinit_handler = do_deinit;
134 ctx->finish_handler = do_finish;
135
136
137 fd = _assuan_sock_new (PF_LOCAL, SOCK_STREAM, 0);
138 if (fd == -1)
139 {
140 _assuan_log_printf ("can't create socket: %s\n", strerror (errno));
141 _assuan_release_context (ctx);
142 return ASSUAN_General_Error;
143 }
144
145 memset (&srvr_addr, 0, sizeof srvr_addr);
146 srvr_addr.sun_family = AF_LOCAL;
147 strncpy (srvr_addr.sun_path, name, sizeof (srvr_addr.sun_path) - 1);
148 srvr_addr.sun_path[sizeof (srvr_addr.sun_path) - 1] = 0;
149 len = SUN_LEN (&srvr_addr);
150
151
152 if (_assuan_sock_connect (fd, (struct sockaddr *) &srvr_addr, len) == -1)
153 {
154 _assuan_log_printf ("can't connect to `%s': %s\n",
155 name, strerror (errno));
156 _assuan_release_context (ctx);
157 _assuan_close (fd);
158 return ASSUAN_Connect_Failed;
159 }
160
161 ctx->inbound.fd = fd;
162 ctx->outbound.fd = fd;
163 ctx->io = &io;
164
165 /* initial handshake */
166 {
167 int okay, off;
168
169 err = _assuan_read_from_server (ctx, &okay, &off);
170 if (err)
171 _assuan_log_printf ("can't connect to server: %s\n",
172 assuan_strerror (err));
173 else if (okay != 1)
174 {
175 /*LOG ("can't connect to server: `");*/
176 _assuan_log_sanitized_string (ctx->inbound.line);
177 fprintf (assuan_get_assuan_log_stream (), "'\n");
178 err = ASSUAN_Connect_Failed;
179 }
180 }
181
182 if (err)
183 {
184 assuan_disconnect (ctx);
185 }
186 else
187 *r_ctx = ctx;
188 return 0;
189 }
190