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Annotation of 43BSDReno/usr.sbin/gettable/gettable.c, revision 1.1

1.1     ! root        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 are permitted provided
        !             6:  * that: (1) source distributions retain this entire copyright notice and
        !             7:  * comment, and (2) distributions including binaries display the following
        !             8:  * acknowledgement:  ``This product includes software developed by the
        !             9:  * University of California, Berkeley and its contributors'' in the
        !            10:  * documentation or other materials provided with the distribution and in
        !            11:  * all advertising materials mentioning features or use of this software.
        !            12:  * Neither the name of the University nor the names of its contributors may
        !            13:  * be used to endorse or promote products derived from this software without
        !            14:  * specific prior written permission.
        !            15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            16:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            17:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            18:  */
        !            19: 
        !            20: #ifndef lint
        !            21: char copyright[] =
        !            22: "@(#) Copyright (c) 1983 The Regents of the University of California.\n\
        !            23:  All rights reserved.\n";
        !            24: #endif /* not lint */
        !            25: 
        !            26: #ifndef lint
        !            27: static char sccsid[] = "@(#)gettable.c 5.5 (Berkeley) 6/1/90";
        !            28: #endif /* not lint */
        !            29: 
        !            30: #include <sys/types.h>
        !            31: #include <sys/socket.h>
        !            32: 
        !            33: #include <netinet/in.h>
        !            34: 
        !            35: #include <stdio.h>
        !            36: #include <netdb.h>
        !            37: 
        !            38: #define        OUTFILE         "hosts.txt"     /* default output file */
        !            39: #define        VERFILE         "hosts.ver"     /* default version file */
        !            40: #define        QUERY           "ALL\r\n"       /* query to hostname server */
        !            41: #define        VERSION         "VERSION\r\n"   /* get version number */
        !            42: 
        !            43: #define        equaln(s1, s2, n)       (!strncmp(s1, s2, n))
        !            44: 
        !            45: struct sockaddr_in sin;
        !            46: char   buf[BUFSIZ];
        !            47: char   *outfile = OUTFILE;
        !            48: 
        !            49: main(argc, argv)
        !            50:        int argc;
        !            51:        char *argv[];
        !            52: {
        !            53:        int s;
        !            54:        register len;
        !            55:        register FILE *sfi, *sfo, *hf;
        !            56:        char *host;
        !            57:        register struct hostent *hp;
        !            58:        struct servent *sp;
        !            59:        int version = 0;
        !            60:        int beginseen = 0;
        !            61:        int endseen = 0;
        !            62: 
        !            63:        argv++, argc--;
        !            64:        if (**argv == '-') {
        !            65:                if (argv[0][1] != 'v')
        !            66:                        fprintf(stderr, "unknown option %s ignored\n", *argv);
        !            67:                else
        !            68:                        version++, outfile = VERFILE;
        !            69:                argv++, argc--;
        !            70:        }
        !            71:        if (argc < 1 || argc > 2) {
        !            72:                fprintf(stderr, "usage: gettable [-v] host [ file ]\n");
        !            73:                exit(1);
        !            74:        }
        !            75:        sp = getservbyname("hostnames", "tcp");
        !            76:        if (sp == NULL) {
        !            77:                fprintf(stderr, "gettable: hostnames/tcp: unknown service\n");
        !            78:                exit(3);
        !            79:        }
        !            80:        host = *argv;
        !            81:        argv++, argc--;
        !            82:        hp = gethostbyname(host);
        !            83:        if (hp == NULL) {
        !            84:                fprintf(stderr, "gettable: %s: ", host);
        !            85:                herror((char *)NULL);
        !            86:                exit(2);
        !            87:        }
        !            88:        host = hp->h_name;
        !            89:        if (argc > 0)
        !            90:                outfile = *argv;
        !            91:        sin.sin_family = hp->h_addrtype;
        !            92:        s = socket(hp->h_addrtype, SOCK_STREAM, 0);
        !            93:        if (s < 0) {
        !            94:                perror("gettable: socket");
        !            95:                exit(4);
        !            96:        }
        !            97:        if (bind(s, &sin, sizeof (sin)) < 0) {
        !            98:                perror("gettable: bind");
        !            99:                exit(5);
        !           100:        }
        !           101:        bcopy(hp->h_addr, (char *)&sin.sin_addr, hp->h_length);
        !           102:        sin.sin_port = sp->s_port;
        !           103:        if (connect(s, &sin, sizeof (sin)) < 0) {
        !           104:                perror("gettable: connect");
        !           105:                exit(6);
        !           106:        }
        !           107:        fprintf(stderr, "Connection to %s opened.\n", host);
        !           108:        sfi = fdopen(s, "r");
        !           109:        sfo = fdopen(s, "w");
        !           110:        if (sfi == NULL || sfo == NULL) {
        !           111:                perror("gettable: fdopen");
        !           112:                close(s);
        !           113:                exit(1);
        !           114:        }
        !           115:        hf = fopen(outfile, "w");
        !           116:        if (hf == NULL) {
        !           117:                fprintf(stderr, "gettable: "); perror(outfile);
        !           118:                close(s);
        !           119:                exit(1);
        !           120:        }
        !           121:        fprintf(sfo, version ? VERSION : QUERY);
        !           122:        fflush(sfo);
        !           123:        while (fgets(buf, sizeof(buf), sfi) != NULL) {
        !           124:                len = strlen(buf);
        !           125:                buf[len-2] = '\0';
        !           126:                if (!version && equaln(buf, "BEGIN", 5)) {
        !           127:                        if (beginseen || endseen) {
        !           128:                                fprintf(stderr,
        !           129:                                    "gettable: BEGIN sequence error\n");
        !           130:                                exit(90);
        !           131:                        }
        !           132:                        beginseen++;
        !           133:                        continue;
        !           134:                }
        !           135:                if (!version && equaln(buf, "END", 3)) {
        !           136:                        if (!beginseen || endseen) {
        !           137:                                fprintf(stderr,
        !           138:                                    "gettable: END sequence error\n");
        !           139:                                exit(91);
        !           140:                        }
        !           141:                        endseen++;
        !           142:                        continue;
        !           143:                }
        !           144:                if (equaln(buf, "ERR", 3)) {
        !           145:                        fprintf(stderr,
        !           146:                            "gettable: hostname service error: %s", buf);
        !           147:                        exit(92);
        !           148:                }
        !           149:                fprintf(hf, "%s\n", buf);
        !           150:        }
        !           151:        fclose(hf);
        !           152:        if (!version) {
        !           153:                if (!beginseen) {
        !           154:                        fprintf(stderr, "gettable: no BEGIN seen\n");
        !           155:                        exit(93);
        !           156:                }
        !           157:                if (!endseen) {
        !           158:                        fprintf(stderr, "gettable: no END seen\n");
        !           159:                        exit(94);
        !           160:                }
        !           161:                fprintf(stderr, "Host table received.\n");
        !           162:        } else
        !           163:                fprintf(stderr, "Version number received.\n");
        !           164:        close(s);
        !           165:        fprintf(stderr, "Connection to %s closed\n", host);
        !           166:        exit(0);
        !           167: }

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