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Annotation of 43BSDReno/usr.bin/finger/net.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1989 The Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * This code is derived from software contributed to Berkeley by
        !             6:  * Tony Nardo of the Johns Hopkins University/Applied Physics Lab.
        !             7:  *
        !             8:  * Redistribution and use in source and binary forms are permitted provided
        !             9:  * that: (1) source distributions retain this entire copyright notice and
        !            10:  * comment, and (2) distributions including binaries display the following
        !            11:  * acknowledgement:  ``This product includes software developed by the
        !            12:  * University of California, Berkeley and its contributors'' in the
        !            13:  * documentation or other materials provided with the distribution and in
        !            14:  * all advertising materials mentioning features or use of this software.
        !            15:  * Neither the name of the University nor the names of its contributors may
        !            16:  * be used to endorse or promote products derived from this software without
        !            17:  * specific prior written permission.
        !            18:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            19:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            20:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            21:  */
        !            22: 
        !            23: #ifndef lint
        !            24: static char sccsid[] = "@(#)net.c      5.5 (Berkeley) 6/1/90";
        !            25: #endif /* not lint */
        !            26: 
        !            27: #include <sys/types.h>
        !            28: #include <sys/socket.h>
        !            29: #include <netinet/in.h>
        !            30: #include <netdb.h>
        !            31: #include <stdio.h>
        !            32: #include <ctype.h>
        !            33: 
        !            34: netfinger(name)
        !            35:        char *name;
        !            36: {
        !            37:        extern int lflag;
        !            38:        register FILE *fp;
        !            39:        register int c, lastc;
        !            40:        struct in_addr defaddr;
        !            41:        struct hostent *hp, def;
        !            42:        struct servent *sp;
        !            43:        struct sockaddr_in sin;
        !            44:        int s;
        !            45:        char *alist[1], *host, *rindex();
        !            46:        u_long inet_addr();
        !            47: 
        !            48:        if (!(host = rindex(name, '@')))
        !            49:                return;
        !            50:        *host++ = NULL;
        !            51:        if (!(hp = gethostbyname(host))) {
        !            52:                defaddr.s_addr = inet_addr(host);
        !            53:                if (defaddr.s_addr == -1) {
        !            54:                        (void)fprintf(stderr,
        !            55:                            "finger: unknown host: %s\n", host);
        !            56:                        return;
        !            57:                }
        !            58:                def.h_name = host;
        !            59:                def.h_addr_list = alist;
        !            60:                def.h_addr = (char *)&defaddr;
        !            61:                def.h_length = sizeof(struct in_addr);
        !            62:                def.h_addrtype = AF_INET;
        !            63:                def.h_aliases = 0;
        !            64:                hp = &def;
        !            65:        }
        !            66:        if (!(sp = getservbyname("finger", "tcp"))) {
        !            67:                (void)fprintf(stderr, "finger: tcp/finger: unknown service\n");
        !            68:                return;
        !            69:        }
        !            70:        sin.sin_family = hp->h_addrtype;
        !            71:        bcopy(hp->h_addr, (char *)&sin.sin_addr, hp->h_length);
        !            72:        sin.sin_port = sp->s_port;
        !            73:        if ((s = socket(hp->h_addrtype, SOCK_STREAM, 0)) < 0) {
        !            74:                perror("finger: socket");
        !            75:                return;
        !            76:        }
        !            77: 
        !            78:        /* have network connection; identify the host connected with */
        !            79:        (void)printf("[%s]\n", hp->h_name);
        !            80:        if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
        !            81:                perror("finger: connect");
        !            82:                (void)close(s);
        !            83:                return;
        !            84:        }
        !            85: 
        !            86:        /* -l flag for remote fingerd  */
        !            87:        if (lflag)
        !            88:                write(s, "/W ", 3);
        !            89:        /* send the name followed by <CR><LF> */
        !            90:        (void)write(s, name, strlen(name));
        !            91:        (void)write(s, "\r\n", 2);
        !            92: 
        !            93:        /*
        !            94:         * Read from the remote system; once we're connected, we assume some
        !            95:         * data.  If none arrives, we hang until the user interrupts.
        !            96:         *
        !            97:         * If we see a <CR> or a <CR> with the high bit set, treat it as
        !            98:         * a newline; if followed by a newline character, only output one
        !            99:         * newline.
        !           100:         *
        !           101:         * Otherwise, all high bits are stripped; if it isn't printable and
        !           102:         * it isn't a space, we can simply set the 7th bit.  Every ASCII
        !           103:         * character with bit 7 set is printable.
        !           104:         */ 
        !           105:        if (fp = fdopen(s, "r"))
        !           106:                while ((c = getc(fp)) != EOF) {
        !           107:                        c &= 0x7f;
        !           108:                        if (c == 0x0d) {
        !           109:                                c = '\n';
        !           110:                                lastc = '\r';
        !           111:                        } else {
        !           112:                                if (!isprint(c) && !isspace(c))
        !           113:                                        c |= 0x40;
        !           114:                                if (lastc != '\r' || c != '\n')
        !           115:                                        lastc = c;
        !           116:                                else {
        !           117:                                        lastc = '\n';
        !           118:                                        continue;
        !           119:                                }
        !           120:                        }
        !           121:                        putchar(c);
        !           122:                }
        !           123:        if (lastc != '\n')
        !           124:                putchar('\n');
        !           125:        (void)fclose(fp);
        !           126: }

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