1 /* assuan-listen.c - Wait for a connection (server)
2 * Copyright (C) 2001, 2002, 2004, 2009 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
17 * License along with this program; if not, see <http://www.gnu.org/licenses/>.
18 * SPDX-License-Identifier: LGPL-2.1+
19 */
20
21 #ifdef HAVE_CONFIG_H
22 #include <config.h>
23 #endif
24
25 #include <stdlib.h>
26 #include <stdio.h>
27 #include <string.h>
28 #ifdef HAVE_UNISTD_H
29 # include <unistd.h>
30 #endif
31 #include <errno.h>
32
33 #include "assuan-defs.h"
34
35 gpg_error_t
assuan_set_hello_line(assuan_context_t ctx,const char * line)36 assuan_set_hello_line (assuan_context_t ctx, const char *line)
37 {
38 if (!ctx)
39 return _assuan_error (ctx, GPG_ERR_ASS_INV_VALUE);
40 if (!line)
41 {
42 _assuan_free (ctx, ctx->hello_line);
43 ctx->hello_line = NULL;
44 }
45 else
46 {
47 char *buf = _assuan_malloc (ctx, 3 + strlen (line) + 1);
48 if (!buf)
49 return _assuan_error (ctx, gpg_err_code_from_syserror ());
50 if (strchr (line, '\n'))
51 strcpy (buf, line);
52 else
53 {
54 strcpy (buf, "OK ");
55 strcpy (buf+3, line);
56 }
57 _assuan_free (ctx, ctx->hello_line);
58 ctx->hello_line = buf;
59 }
60 return 0;
61 }
62
63
64 /**
65 * assuan_accept:
66 * @ctx: context
67 *
68 * Cancel any existing connection and wait for a connection from a
69 * client. The initial handshake is performed which may include an
70 * initial authentication or encryption negotiation.
71 *
72 * Return value: 0 on success or an error if the connection could for
73 * some reason not be established.
74 **/
75 gpg_error_t
assuan_accept(assuan_context_t ctx)76 assuan_accept (assuan_context_t ctx)
77 {
78 gpg_error_t rc = 0;
79 const char *p, *pend;
80
81 if (!ctx)
82 return _assuan_error (ctx, GPG_ERR_ASS_INV_VALUE);
83
84 if (ctx->max_accepts != -1)
85 {
86 if (ctx->max_accepts-- == 0)
87 return -1; /* second invocation for pipemode -> terminate */
88 }
89 if (ctx->accept_handler)
90 {
91 /* FIXME: This should be superfluous, if everything else is
92 correct. */
93 ctx->finish_handler (ctx);
94 rc = ctx->accept_handler (ctx);
95 if (rc)
96 return rc;
97 }
98
99 /* Send the hello. */
100 p = ctx->hello_line;
101 if (p && (pend = strchr (p, '\n')))
102 { /* This is a multi line hello. Send all but the last line as
103 comments. */
104 do
105 {
106 rc = _assuan_write_line (ctx, "# ", p, pend - p);
107 if (rc)
108 return rc;
109 p = pend + 1;
110 pend = strchr (p, '\n');
111 }
112 while (pend);
113 rc = _assuan_write_line (ctx, "OK ", p, strlen (p));
114 }
115 else if (p)
116 rc = assuan_write_line (ctx, p);
117 else
118 {
119 static char const okstr[] = "OK Pleased to meet you";
120 pid_t apid = assuan_get_pid (ctx);
121 if (apid != ASSUAN_INVALID_PID)
122 {
123 char tmpbuf[50];
124 snprintf (tmpbuf, sizeof tmpbuf, "%s, process %i", okstr, (int)apid);
125 rc = assuan_write_line (ctx, tmpbuf);
126 }
127 else
128 rc = assuan_write_line (ctx, okstr);
129 }
130 if (rc)
131 return rc;
132
133 return 0;
134 }
135
136
137
138 assuan_fd_t
assuan_get_input_fd(assuan_context_t ctx)139 assuan_get_input_fd (assuan_context_t ctx)
140 {
141 return ctx ? ctx->input_fd : ASSUAN_INVALID_FD;
142 }
143
144
145 assuan_fd_t
assuan_get_output_fd(assuan_context_t ctx)146 assuan_get_output_fd (assuan_context_t ctx)
147 {
148 return ctx ? ctx->output_fd : ASSUAN_INVALID_FD;
149 }
150
151
152 /* Close the fd descriptor set by the command INPUT FD=n. We handle
153 this fd inside assuan so that we can do some initial checks */
154 gpg_error_t
assuan_close_input_fd(assuan_context_t ctx)155 assuan_close_input_fd (assuan_context_t ctx)
156 {
157 if (!ctx || ctx->input_fd == ASSUAN_INVALID_FD)
158 return _assuan_error (ctx, GPG_ERR_ASS_INV_VALUE);
159 _assuan_close (ctx, ctx->input_fd);
160 ctx->input_fd = ASSUAN_INVALID_FD;
161 return 0;
162 }
163
164 /* Close the fd descriptor set by the command OUTPUT FD=n. We handle
165 this fd inside assuan so that we can do some initial checks */
166 gpg_error_t
assuan_close_output_fd(assuan_context_t ctx)167 assuan_close_output_fd (assuan_context_t ctx)
168 {
169 if (!ctx || ctx->output_fd == ASSUAN_INVALID_FD)
170 return _assuan_error (ctx, GPG_ERR_ASS_INV_VALUE);
171
172 _assuan_close (ctx, ctx->output_fd);
173 ctx->output_fd = ASSUAN_INVALID_FD;
174 return 0;
175 }
176
177