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Annotation of 43BSDTahoe/lib/libc/net/rexec.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1980 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that the above copyright notice and this paragraph are
        !             7:  * duplicated in all such forms and that any documentation,
        !             8:  * advertising materials, and other materials related to such
        !             9:  * distribution and use acknowledge that the software was developed
        !            10:  * by the University of California, Berkeley.  The name of the
        !            11:  * University may not be used to endorse or promote products derived
        !            12:  * from this software without specific prior written permission.
        !            13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            16:  */
        !            17: 
        !            18: #if defined(LIBC_SCCS) && !defined(lint)
        !            19: static char sccsid[] = "@(#)rexec.c    5.5 (Berkeley) 6/27/88";
        !            20: #endif /* LIBC_SCCS and not lint */
        !            21: 
        !            22: #include <sys/types.h>
        !            23: #include <sys/socket.h>
        !            24: 
        !            25: #include <netinet/in.h>
        !            26: 
        !            27: #include <stdio.h>
        !            28: #include <netdb.h>
        !            29: #include <errno.h>
        !            30: 
        !            31: extern errno;
        !            32: char   *index();
        !            33: int    rexecoptions;
        !            34: char   *getpass(), *getlogin();
        !            35: 
        !            36: rexec(ahost, rport, name, pass, cmd, fd2p)
        !            37:        char **ahost;
        !            38:        int rport;
        !            39:        char *name, *pass, *cmd;
        !            40:        int *fd2p;
        !            41: {
        !            42:        int s, timo = 1, s3;
        !            43:        struct sockaddr_in sin, sin2, from;
        !            44:        char c;
        !            45:        short port;
        !            46:        struct hostent *hp;
        !            47: 
        !            48:        hp = gethostbyname(*ahost);
        !            49:        if (hp == 0) {
        !            50:                fprintf(stderr, "%s: unknown host\n", *ahost);
        !            51:                return (-1);
        !            52:        }
        !            53:        *ahost = hp->h_name;
        !            54:        ruserpass(hp->h_name, &name, &pass);
        !            55: retry:
        !            56:        s = socket(AF_INET, SOCK_STREAM, 0);
        !            57:        if (s < 0) {
        !            58:                perror("rexec: socket");
        !            59:                return (-1);
        !            60:        }
        !            61:        sin.sin_family = hp->h_addrtype;
        !            62:        sin.sin_port = rport;
        !            63:        bcopy(hp->h_addr, (caddr_t)&sin.sin_addr, hp->h_length);
        !            64:        if (connect(s, &sin, sizeof(sin)) < 0) {
        !            65:                if (errno == ECONNREFUSED && timo <= 16) {
        !            66:                        (void) close(s);
        !            67:                        sleep(timo);
        !            68:                        timo *= 2;
        !            69:                        goto retry;
        !            70:                }
        !            71:                perror(hp->h_name);
        !            72:                return (-1);
        !            73:        }
        !            74:        if (fd2p == 0) {
        !            75:                (void) write(s, "", 1);
        !            76:                port = 0;
        !            77:        } else {
        !            78:                char num[8];
        !            79:                int s2, sin2len;
        !            80:                
        !            81:                s2 = socket(AF_INET, SOCK_STREAM, 0);
        !            82:                if (s2 < 0) {
        !            83:                        (void) close(s);
        !            84:                        return (-1);
        !            85:                }
        !            86:                listen(s2, 1);
        !            87:                sin2len = sizeof (sin2);
        !            88:                if (getsockname(s2, (char *)&sin2, &sin2len) < 0 ||
        !            89:                  sin2len != sizeof (sin2)) {
        !            90:                        perror("getsockname");
        !            91:                        (void) close(s2);
        !            92:                        goto bad;
        !            93:                }
        !            94:                port = ntohs((u_short)sin2.sin_port);
        !            95:                (void) sprintf(num, "%d", port);
        !            96:                (void) write(s, num, strlen(num)+1);
        !            97:                { int len = sizeof (from);
        !            98:                  s3 = accept(s2, &from, &len, 0);
        !            99:                  close(s2);
        !           100:                  if (s3 < 0) {
        !           101:                        perror("accept");
        !           102:                        port = 0;
        !           103:                        goto bad;
        !           104:                  }
        !           105:                }
        !           106:                *fd2p = s3;
        !           107:        }
        !           108:        (void) write(s, name, strlen(name) + 1);
        !           109:        /* should public key encypt the password here */
        !           110:        (void) write(s, pass, strlen(pass) + 1);
        !           111:        (void) write(s, cmd, strlen(cmd) + 1);
        !           112:        if (read(s, &c, 1) != 1) {
        !           113:                perror(*ahost);
        !           114:                goto bad;
        !           115:        }
        !           116:        if (c != 0) {
        !           117:                while (read(s, &c, 1) == 1) {
        !           118:                        (void) write(2, &c, 1);
        !           119:                        if (c == '\n')
        !           120:                                break;
        !           121:                }
        !           122:                goto bad;
        !           123:        }
        !           124:        return (s);
        !           125: bad:
        !           126:        if (port)
        !           127:                (void) close(*fd2p);
        !           128:        (void) close(s);
        !           129:        return (-1);
        !           130: }

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