| 1 | /* |
| 2 | * Copyright (c) 1983 The Regents of the University of California. |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in the |
| 12 | * documentation and/or other materials provided with the distribution. |
| 13 | * 3. All advertising materials mentioning features or use of this software |
| 14 | * must display the following acknowledgement: |
| 15 | * This product includes software developed by the University of |
| 16 | * California, Berkeley and its contributors. |
| 17 | * 4. Neither the name of the University nor the names of its contributors |
| 18 | * may be used to endorse or promote products derived from this software |
| 19 | * without specific prior written permission. |
| 20 | * |
| 21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 31 | * SUCH DAMAGE. |
| 32 | */ |
| 33 | |
| 34 | #ifndef lint |
| 35 | char copyright[] = |
| 36 | "@(#) Copyright (c) 1983 The Regents of the University of California.\n\ |
| 37 | All rights reserved.\n"; |
| 38 | #endif /* not lint */ |
| 39 | |
| 40 | #ifndef lint |
| 41 | static char sccsid[] = "@(#)gettable.c 5.6 (Berkeley) 3/2/91"; |
| 42 | #endif /* not lint */ |
| 43 | |
| 44 | #include <sys/types.h> |
| 45 | #include <sys/socket.h> |
| 46 | |
| 47 | #include <netinet/in.h> |
| 48 | |
| 49 | #include <stdio.h> |
| 50 | #include <netdb.h> |
| 51 | |
| 52 | #define OUTFILE "hosts.txt" /* default output file */ |
| 53 | #define VERFILE "hosts.ver" /* default version file */ |
| 54 | #define QUERY "ALL\r\n" /* query to hostname server */ |
| 55 | #define VERSION "VERSION\r\n" /* get version number */ |
| 56 | |
| 57 | #define equaln(s1, s2, n) (!strncmp(s1, s2, n)) |
| 58 | |
| 59 | struct sockaddr_in s_in; |
| 60 | char buf[BUFSIZ]; |
| 61 | char *outfile = OUTFILE; |
| 62 | |
| 63 | main(argc, argv) |
| 64 | int argc; |
| 65 | char *argv[]; |
| 66 | { |
| 67 | int s; |
| 68 | register len; |
| 69 | register FILE *sfi, *sfo, *hf; |
| 70 | char *host; |
| 71 | register struct hostent *hp; |
| 72 | struct servent *sp; |
| 73 | int version = 0; |
| 74 | int beginseen = 0; |
| 75 | int endseen = 0; |
| 76 | |
| 77 | argv++, argc--; |
| 78 | if (**argv == '-') { |
| 79 | if (argv[0][1] != 'v') |
| 80 | fprintf(stderr, "unknown option %s ignored\n", *argv); |
| 81 | else |
| 82 | version++, outfile = VERFILE; |
| 83 | argv++, argc--; |
| 84 | } |
| 85 | if (argc < 1 || argc > 2) { |
| 86 | fprintf(stderr, "usage: gettable [-v] host [ file ]\n"); |
| 87 | exit(1); |
| 88 | } |
| 89 | sp = getservbyname("hostnames", "tcp"); |
| 90 | if (sp == NULL) { |
| 91 | fprintf(stderr, "gettable: hostnames/tcp: unknown service\n"); |
| 92 | exit(3); |
| 93 | } |
| 94 | host = *argv; |
| 95 | argv++, argc--; |
| 96 | hp = gethostbyname(host); |
| 97 | if (hp == NULL) { |
| 98 | fprintf(stderr, "gettable: %s: ", host); |
| 99 | herror((char *)NULL); |
| 100 | exit(2); |
| 101 | } |
| 102 | host = hp->h_name; |
| 103 | if (argc > 0) |
| 104 | outfile = *argv; |
| 105 | s_in.sin_family = hp->h_addrtype; |
| 106 | s = socket(hp->h_addrtype, SOCK_STREAM, 0); |
| 107 | if (s < 0) { |
| 108 | perror("gettable: socket"); |
| 109 | exit(4); |
| 110 | } |
| 111 | if (bind(s, (struct sockaddr *)&s_in, sizeof (s_in)) < 0) { |
| 112 | perror("gettable: bind"); |
| 113 | exit(5); |
| 114 | } |
| 115 | bcopy(hp->h_addr, &s_in.sin_addr, hp->h_length); |
| 116 | s_in.sin_port = sp->s_port; |
| 117 | if (connect(s, (struct sockaddr *)&s_in, sizeof (s_in)) < 0) { |
| 118 | perror("gettable: connect"); |
| 119 | exit(6); |
| 120 | } |
| 121 | fprintf(stderr, "Connection to %s opened.\n", host); |
| 122 | sfi = fdopen(s, "r"); |
| 123 | sfo = fdopen(s, "w"); |
| 124 | if (sfi == NULL || sfo == NULL) { |
| 125 | perror("gettable: fdopen"); |
| 126 | close(s); |
| 127 | exit(1); |
| 128 | } |
| 129 | hf = fopen(outfile, "w"); |
| 130 | if (hf == NULL) { |
| 131 | fprintf(stderr, "gettable: "); perror(outfile); |
| 132 | close(s); |
| 133 | exit(1); |
| 134 | } |
| 135 | fprintf(sfo, version ? VERSION : QUERY); |
| 136 | fflush(sfo); |
| 137 | while (fgets(buf, sizeof(buf), sfi) != NULL) { |
| 138 | len = strlen(buf); |
| 139 | buf[len-2] = '\0'; |
| 140 | if (!version && equaln(buf, "BEGIN", 5)) { |
| 141 | if (beginseen || endseen) { |
| 142 | fprintf(stderr, |
| 143 | "gettable: BEGIN sequence error\n"); |
| 144 | exit(90); |
| 145 | } |
| 146 | beginseen++; |
| 147 | continue; |
| 148 | } |
| 149 | if (!version && equaln(buf, "END", 3)) { |
| 150 | if (!beginseen || endseen) { |
| 151 | fprintf(stderr, |
| 152 | "gettable: END sequence error\n"); |
| 153 | exit(91); |
| 154 | } |
| 155 | endseen++; |
| 156 | continue; |
| 157 | } |
| 158 | if (equaln(buf, "ERR", 3)) { |
| 159 | fprintf(stderr, |
| 160 | "gettable: hostname service error: %s", buf); |
| 161 | exit(92); |
| 162 | } |
| 163 | fprintf(hf, "%s\n", buf); |
| 164 | } |
| 165 | fclose(hf); |
| 166 | if (!version) { |
| 167 | if (!beginseen) { |
| 168 | fprintf(stderr, "gettable: no BEGIN seen\n"); |
| 169 | exit(93); |
| 170 | } |
| 171 | if (!endseen) { |
| 172 | fprintf(stderr, "gettable: no END seen\n"); |
| 173 | exit(94); |
| 174 | } |
| 175 | fprintf(stderr, "Host table received.\n"); |
| 176 | } else |
| 177 | fprintf(stderr, "Version number received.\n"); |
| 178 | close(s); |
| 179 | fprintf(stderr, "Connection to %s closed\n", host); |
| 180 | exit(0); |
| 181 | } |