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rename and movement of README contents
author meillo@marmaro.de
date Sun, 30 May 2010 17:11:07 +0200
parents 08114f7dcc23
children
line source
1 /*
2 ** id_open.c Establish/initiate a connection to an IDENT server
3 **
4 ** Author: Peter Eriksson <pen@lysator.liu.se>
5 ** Fixes: Pär Emanuelsson <pell@lysator.liu.se>
6 */
7
8 #ifdef NeXT3
9 # include <libc.h>
10 #endif
11
12 #include <stdio.h>
13 #include <errno.h>
14 #include <fcntl.h>
15
16 #ifdef HAVE_ANSIHEADERS
17 # include <stdlib.h>
18 # include <string.h>
19 # include <unistd.h>
20 # if !defined(__sgi) && !defined(VMS)
21 # define bzero(p,l) memset(p, 0, l)
22 # endif
23 #endif
24
25 #include <sys/types.h>
26 #include <sys/socket.h>
27 #include <sys/wait.h>
28 #include <sys/time.h>
29 #include <sys/file.h>
30
31 #define IN_LIBIDENT_SRC
32 #include "ident.h"
33
34 #include <arpa/inet.h>
35
36 #ifdef _AIX
37 # include <sys/select.h>
38 #endif
39
40
41 /*
42 ident_t *id_open __P3(struct in_addr *, laddr, struct in_addr *, faddr, struct timeval *, timeout)
43 */
44
45 ident_t*
46 id_open __P((__STRUCT_IN_ADDR_P laddr, __STRUCT_IN_ADDR_P faddr, __STRUCT_TIMEVAL_P timeout))
47 {
48 ident_t *id;
49 int res, tmperrno;
50 struct sockaddr_in sin_laddr, sin_faddr;
51 fd_set rs, ws, es;
52 #ifndef OLD_SETSOCKOPT
53 int on = 1;
54 struct linger linger;
55 #endif
56
57 if ((id = (ident_t *) malloc(sizeof(*id))) == 0)
58 return 0;
59
60 if ((id->fd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
61 free(id);
62 return 0;
63 }
64
65 if (timeout) {
66 if ((res = fcntl(id->fd, F_GETFL, 0)) < 0)
67 goto ERROR;
68
69 #ifndef VMS
70 if (fcntl(id->fd, F_SETFL, res | FNDELAY) < 0)
71 goto ERROR;
72 #endif
73 }
74
75 /* We silently ignore errors if we can't change LINGER */
76 #ifdef OLD_SETSOCKOPT
77 /* Old style setsockopt() */
78 (void) setsockopt(id->fd, SOL_SOCKET, SO_DONTLINGER);
79 (void) setsockopt(id->fd, SOL_SOCKET, SO_REUSEADDR);
80 #else
81 /* New style setsockopt() */
82 linger.l_onoff = 0;
83 linger.l_linger = 0;
84
85 (void) setsockopt(id->fd, SOL_SOCKET, SO_LINGER, (void *) &linger, sizeof(linger));
86 (void) setsockopt(id->fd, SOL_SOCKET, SO_REUSEADDR, (void *) &on, sizeof(on));
87 #endif
88
89 id->buf[0] = '\0';
90
91 bzero((char *) &sin_laddr, sizeof(sin_laddr));
92 sin_laddr.sin_family = AF_INET;
93 sin_laddr.sin_addr = *laddr;
94 sin_laddr.sin_port = 0;
95
96 if (bind(id->fd, (struct sockaddr *) &sin_laddr, sizeof(sin_laddr)) < 0) {
97 #ifdef DEBUG
98 perror("libident: bind");
99 #endif
100 goto ERROR;
101 }
102
103 bzero((char *) &sin_faddr, sizeof(sin_faddr));
104 sin_faddr.sin_family = AF_INET;
105 sin_faddr.sin_addr = *faddr;
106 sin_faddr.sin_port = htons(IDPORT);
107
108 errno = 0;
109 res = connect(id->fd, (struct sockaddr *) &sin_faddr, sizeof(sin_faddr));
110 if (res < 0 && errno != EINPROGRESS) {
111 #ifdef DEBUG
112 perror("libident: connect");
113 #endif
114 goto ERROR;
115 }
116
117 if (timeout) {
118 FD_ZERO(&rs);
119 FD_ZERO(&ws);
120 FD_ZERO(&es);
121
122 FD_SET(id->fd, &rs);
123 FD_SET(id->fd, &ws);
124 FD_SET(id->fd, &es);
125
126 #ifdef __hpux
127 if ((res = select(FD_SETSIZE, (int *) &rs, (int *) &ws, (int *) &es, timeout)) < 0)
128 #else
129 if ((res = select(FD_SETSIZE, &rs, &ws, &es, timeout)) < 0)
130 #endif
131 {
132 #ifdef DEBUG
133 perror("libident: select");
134 #endif
135 goto ERROR;
136 }
137
138 if (res == 0) {
139 errno = ETIMEDOUT;
140 goto ERROR;
141 }
142
143 if (FD_ISSET(id->fd, &es))
144 goto ERROR;
145
146 if (!FD_ISSET(id->fd, &rs) && !FD_ISSET(id->fd, &ws))
147 goto ERROR;
148 }
149
150 return id;
151
152 ERROR:
153 tmperrno = errno; /* Save, so close() won't erase it */
154 close(id->fd);
155 free(id);
156 errno = tmperrno;
157 return 0;
158 }