1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
|
/*
* Copyright (C) 2000-2012 Free Software Foundation, Inc.
*
* This file is part of GnuTLS.
*
* GnuTLS is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GnuTLS is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#if HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#elif HAVE_WS2TCPIP_H
#include <ws2tcpip.h>
#endif
#include <netdb.h>
#include <string.h>
#include <errno.h>
#include <sys/select.h>
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#ifndef _WIN32
#include <signal.h>
#endif
#include <socket.h>
#include "sockets.h"
#define MAX_BUF 4096
extern unsigned int verbose;
/* Functions to manipulate sockets
*/
ssize_t
socket_recv(const socket_st * socket, void *buffer, int buffer_size)
{
int ret;
if (socket->secure) {
do {
ret =
gnutls_record_recv(socket->session, buffer,
buffer_size);
if (ret == GNUTLS_E_HEARTBEAT_PING_RECEIVED)
gnutls_heartbeat_pong(socket->session, 0);
}
while (ret == GNUTLS_E_INTERRUPTED || ret == GNUTLS_E_AGAIN
|| ret == GNUTLS_E_HEARTBEAT_PING_RECEIVED);
} else
do {
ret = recv(socket->fd, buffer, buffer_size, 0);
}
while (ret == -1 && errno == EINTR);
return ret;
}
ssize_t
socket_send(const socket_st * socket, const void *buffer, int buffer_size)
{
return socket_send_range(socket, buffer, buffer_size, NULL);
}
ssize_t
socket_send_range(const socket_st * socket, const void *buffer,
int buffer_size, gnutls_range_st * range)
{
int ret;
if (socket->secure)
do {
if (range == NULL)
ret =
gnutls_record_send(socket->session,
buffer,
buffer_size);
else
ret =
gnutls_record_send_range(socket->
session,
buffer,
buffer_size,
range);
}
while (ret == GNUTLS_E_AGAIN
|| ret == GNUTLS_E_INTERRUPTED);
else
do {
ret = send(socket->fd, buffer, buffer_size, 0);
}
while (ret == -1 && errno == EINTR);
if (ret > 0 && ret != buffer_size && verbose)
fprintf(stderr,
"*** Only sent %d bytes instead of %d.\n", ret,
buffer_size);
return ret;
}
void socket_bye(socket_st * socket)
{
int ret;
if (socket->secure) {
do
ret = gnutls_bye(socket->session, GNUTLS_SHUT_WR);
while (ret == GNUTLS_E_INTERRUPTED
|| ret == GNUTLS_E_AGAIN);
if (ret < 0)
fprintf(stderr, "*** gnutls_bye() error: %s\n",
gnutls_strerror(ret));
gnutls_deinit(socket->session);
socket->session = NULL;
}
freeaddrinfo(socket->addr_info);
socket->addr_info = socket->ptr = NULL;
free(socket->ip);
free(socket->hostname);
free(socket->service);
shutdown(socket->fd, SHUT_RDWR); /* no more receptions */
close(socket->fd);
socket->fd = -1;
socket->secure = 0;
}
void
socket_open(socket_st * hd, const char *hostname, const char *service,
int udp)
{
struct addrinfo hints, *res, *ptr;
int sd, err;
char buffer[MAX_BUF + 1];
char portname[16] = { 0 };
printf("Resolving '%s'...\n", hostname);
/* get server name */
memset(&hints, 0, sizeof(hints));
hints.ai_socktype = udp ? SOCK_DGRAM : SOCK_STREAM;
if ((err = getaddrinfo(hostname, service, &hints, &res))) {
fprintf(stderr, "Cannot resolve %s:%s: %s\n", hostname,
service, gai_strerror(err));
exit(1);
}
sd = -1;
for (ptr = res; ptr != NULL; ptr = ptr->ai_next) {
sd = socket(ptr->ai_family, ptr->ai_socktype,
ptr->ai_protocol);
if (sd == -1)
continue;
if ((err =
getnameinfo(ptr->ai_addr, ptr->ai_addrlen, buffer,
MAX_BUF, portname, sizeof(portname),
NI_NUMERICHOST | NI_NUMERICSERV)) != 0) {
fprintf(stderr, "getnameinfo(): %s\n",
gai_strerror(err));
continue;
}
if (hints.ai_socktype == SOCK_DGRAM) {
#if defined(IP_DONTFRAG)
int yes = 1;
if (setsockopt(sd, IPPROTO_IP, IP_DONTFRAG,
(const void *) &yes,
sizeof(yes)) < 0)
perror("setsockopt(IP_DF) failed");
#elif defined(IP_MTU_DISCOVER)
int yes = IP_PMTUDISC_DO;
if (setsockopt(sd, IPPROTO_IP, IP_MTU_DISCOVER,
(const void *) &yes,
sizeof(yes)) < 0)
perror("setsockopt(IP_DF) failed");
#endif
}
printf("Connecting to '%s:%s'...\n", buffer, portname);
err = connect(sd, ptr->ai_addr, ptr->ai_addrlen);
if (err < 0) {
int e = errno;
fprintf(stderr, "Cannot connect to %s:%s: %s\n",
buffer, portname, strerror(e));
continue;
}
break;
}
if (err != 0)
exit(1);
if (sd == -1) {
fprintf(stderr, "Could not find a supported socket\n");
exit(1);
}
hd->secure = 0;
hd->fd = sd;
hd->hostname = strdup(hostname);
hd->ip = strdup(buffer);
hd->service = strdup(portname);
hd->ptr = ptr;
hd->addr_info = res;
return;
}
void sockets_init(void)
{
#ifdef _WIN32
WORD wVersionRequested;
WSADATA wsaData;
wVersionRequested = MAKEWORD(1, 1);
if (WSAStartup(wVersionRequested, &wsaData) != 0) {
perror("WSA_STARTUP_ERROR");
}
#else
signal(SIGPIPE, SIG_IGN);
#endif
}
|
