Annotation of src/usr.bin/finger/net.c, Revision 1.7
1.7 ! itojun 1: /* $OpenBSD: net.c,v 1.6 1998/07/10 15:45:16 mickey Exp $ */
1.2 deraadt 2:
1.1 deraadt 3: /*
4: * Copyright (c) 1989 The Regents of the University of California.
5: * All rights reserved.
6: *
7: * This code is derived from software contributed to Berkeley by
8: * Tony Nardo of the Johns Hopkins University/Applied Physics Lab.
9: *
10: * Redistribution and use in source and binary forms, with or without
11: * modification, are permitted provided that the following conditions
12: * are met:
13: * 1. Redistributions of source code must retain the above copyright
14: * notice, this list of conditions and the following disclaimer.
15: * 2. Redistributions in binary form must reproduce the above copyright
16: * notice, this list of conditions and the following disclaimer in the
17: * documentation and/or other materials provided with the distribution.
18: * 3. All advertising materials mentioning features or use of this software
19: * must display the following acknowledgement:
20: * This product includes software developed by the University of
21: * California, Berkeley and its contributors.
22: * 4. Neither the name of the University nor the names of its contributors
23: * may be used to endorse or promote products derived from this software
24: * without specific prior written permission.
25: *
26: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36: * SUCH DAMAGE.
37: */
38:
39: #ifndef lint
40: /*static char sccsid[] = "from: @(#)net.c 5.5 (Berkeley) 6/1/90";*/
1.7 ! itojun 41: static char rcsid[] = "$OpenBSD: net.c,v 1.6 1998/07/10 15:45:16 mickey Exp $";
1.1 deraadt 42: #endif /* not lint */
43:
44: #include <sys/types.h>
45: #include <sys/socket.h>
46: #include <netinet/in.h>
47: #include <arpa/inet.h>
48: #include <netdb.h>
49: #include <stdio.h>
50: #include <string.h>
51: #include <ctype.h>
1.5 kstailey 52: #include <unistd.h>
1.6 mickey 53: #include <err.h>
1.5 kstailey 54: #include "finger.h"
55: #include "extern.h"
1.1 deraadt 56:
1.5 kstailey 57: void
1.1 deraadt 58: netfinger(name)
59: char *name;
60: {
1.5 kstailey 61: FILE *fp;
62: int c, lastc;
1.1 deraadt 63: int s;
1.5 kstailey 64: char *host;
1.7 ! itojun 65: struct addrinfo hints, *res0, *res;
! 66: int error;
! 67: char hbuf[NI_MAXHOST];
1.1 deraadt 68:
1.5 kstailey 69: lastc = 0;
1.3 millert 70: if (!(host = strrchr(name, '@')))
1.1 deraadt 71: return;
1.5 kstailey 72: *host++ = '\0';
1.7 ! itojun 73: memset(&hints, 0, sizeof(hints));
! 74: hints.ai_family = PF_UNSPEC;
! 75: hints.ai_socktype = SOCK_STREAM;
! 76: error = getaddrinfo(host, "finger", &hints, &res0);
! 77: if (error) {
! 78: warnx("%s", gai_strerror(error));
! 79: return;
! 80: }
! 81:
! 82: s = -1;
! 83: for (res = res0; res; res = res->ai_next) {
! 84: if ((s = socket(res->ai_family, res->ai_socktype,
! 85: res->ai_protocol)) < 0) {
! 86: continue;
1.1 deraadt 87: }
1.7 ! itojun 88: if (connect(s, res->ai_addr, res->ai_addrlen) < 0) {
! 89: (void)close(s);
! 90: s = -1;
! 91: continue;
! 92: }
! 93:
! 94: break;
1.1 deraadt 95: }
1.7 ! itojun 96:
! 97: if (s < 0) {
! 98: perror("finger");
! 99: freeaddrinfo(res0);
1.1 deraadt 100: return;
101: }
102:
103: /* have network connection; identify the host connected with */
1.7 ! itojun 104: if (getnameinfo(res->ai_addr, res->ai_addrlen, hbuf, sizeof(hbuf),
! 105: NULL, 0, NI_NUMERICHOST) != 0) {
! 106: strcpy(hbuf, "(invalid)");
1.1 deraadt 107: }
1.7 ! itojun 108: (void)printf("[%s/%s]\n", host, hbuf);
! 109:
! 110: freeaddrinfo(res0);
1.1 deraadt 111:
112: /* -l flag for remote fingerd */
113: if (lflag)
114: write(s, "/W ", 3);
115: /* send the name followed by <CR><LF> */
116: (void)write(s, name, strlen(name));
117: (void)write(s, "\r\n", 2);
118:
119: /*
120: * Read from the remote system; once we're connected, we assume some
121: * data. If none arrives, we hang until the user interrupts.
122: *
123: * If we see a <CR> or a <CR> with the high bit set, treat it as
124: * a newline; if followed by a newline character, only output one
125: * newline.
126: *
127: * Otherwise, all high bits are stripped; if it isn't printable and
128: * it isn't a space, we can simply set the 7th bit. Every ASCII
129: * character with bit 7 set is printable.
1.5 kstailey 130: */
131: if ((fp = fdopen(s, "r")) != NULL)
1.1 deraadt 132: while ((c = getc(fp)) != EOF) {
133: c &= 0x7f;
134: if (c == '\r') {
135: if (lastc == '\r')
136: continue;
137: c = '\n';
138: lastc = '\r';
139: } else {
140: if (!isprint(c) && !isspace(c))
141: c |= 0x40;
142: if (lastc != '\r' || c != '\n')
143: lastc = c;
144: else {
145: lastc = '\n';
146: continue;
147: }
148: }
149: putchar(c);
150: }
151: if (lastc != '\n')
152: putchar('\n');
153: (void)fclose(fp);
154: }
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