1 /*
2 * Copyright (c) 1983, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * %sccs.include.redist.c%
6 */
7
8 #ifndef lint
9 static char copyright[] =
10 "@(#) Copyright (c) 1983, 1993\n\
11 The Regents of the University of California. All rights reserved.\n";
12 #endif /* not lint */
13
14 #ifndef lint
15 static char sccsid[] = "@(#)fingerd.c 8.1 (Berkeley) 06/04/93";
16 #endif /* not lint */
17
18 #include <sys/types.h>
19 #include <sys/socket.h>
20 #include <netinet/in.h>
21 #include <arpa/inet.h>
22 #include <errno.h>
23
24 #include <unistd.h>
25 #include <syslog.h>
26 #include <netdb.h>
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <strings.h>
30 #include "pathnames.h"
31
32 void err __P((const char *, ...));
33
34 int
main(argc,argv)35 main(argc, argv)
36 int argc;
37 char *argv[];
38 {
39 register FILE *fp;
40 register int ch;
41 register char *lp;
42 struct hostent *hp;
43 struct sockaddr_in sin;
44 int p[2], logging, secure, sval;
45 #define ENTRIES 50
46 char **ap, *av[ENTRIES + 1], **comp, line[1024], *prog;
47
48 prog = _PATH_FINGER;
49 logging = secure = 0;
50 openlog("fingerd", LOG_PID | LOG_CONS, LOG_DAEMON);
51 opterr = 0;
52 while ((ch = getopt(argc, argv, "slp:")) != EOF)
53 switch (ch) {
54 case 'l':
55 logging = 1;
56 break;
57 case 'p':
58 prog = optarg;
59 break;
60 case 's':
61 secure = 1;
62 break;
63 case '?':
64 default:
65 err("illegal option -- %c", ch);
66 }
67
68 if (logging) {
69 sval = sizeof(sin);
70 if (getpeername(0, (struct sockaddr *)&sin, &sval) < 0)
71 err("getpeername: %s", strerror(errno));
72 if (hp = gethostbyaddr((char *)&sin.sin_addr.s_addr,
73 sizeof(sin.sin_addr.s_addr), AF_INET))
74 lp = hp->h_name;
75 else
76 lp = inet_ntoa(sin.sin_addr);
77 syslog(LOG_NOTICE, "query from %s", lp);
78 }
79
80 if (!fgets(line, sizeof(line), stdin))
81 exit(1);
82
83 comp = &av[1];
84 for (lp = line, ap = &av[2];;) {
85 *ap = strtok(lp, " \t\r\n");
86 if (!*ap) {
87 if (secure && ap == &av[2]) {
88 puts("must provide username\r\n");
89 exit(1);
90 }
91 break;
92 }
93 if (secure && strchr(*ap, '@')) {
94 puts("fowarding service denied\r\n");
95 exit(1);
96 }
97
98 /* RFC742: "/[Ww]" == "-l" */
99 if ((*ap)[0] == '/' && ((*ap)[1] == 'W' || (*ap)[1] == 'w')) {
100 av[1] = "-l";
101 comp = &av[0];
102 }
103 else if (++ap == av + ENTRIES)
104 break;
105 lp = NULL;
106 }
107
108 if (lp = strrchr(prog, '/'))
109 *comp = ++lp;
110 else
111 *comp = prog;
112 if (pipe(p) < 0)
113 err("pipe: %s", strerror(errno));
114
115 switch(vfork()) {
116 case 0:
117 (void)close(p[0]);
118 if (p[1] != 1) {
119 (void)dup2(p[1], 1);
120 (void)close(p[1]);
121 }
122 execv(prog, comp);
123 err("execv: %s: %s", prog, strerror(errno));
124 _exit(1);
125 case -1:
126 err("fork: %s", strerror(errno));
127 }
128 (void)close(p[1]);
129 if (!(fp = fdopen(p[0], "r")))
130 err("fdopen: %s", strerror(errno));
131 while ((ch = getc(fp)) != EOF) {
132 if (ch == '\n')
133 putchar('\r');
134 putchar(ch);
135 }
136 exit(0);
137 }
138
139 #if __STDC__
140 #include <stdarg.h>
141 #else
142 #include <varargs.h>
143 #endif
144
145 void
146 #if __STDC__
err(const char * fmt,...)147 err(const char *fmt, ...)
148 #else
149 err(fmt, va_alist)
150 char *fmt;
151 va_dcl
152 #endif
153 {
154 va_list ap;
155 #if __STDC__
156 va_start(ap, fmt);
157 #else
158 va_start(ap);
159 #endif
160 (void)vsyslog(LOG_ERR, fmt, ap);
161 va_end(ap);
162 exit(1);
163 /* NOTREACHED */
164 }
165