Return to rexec.c CVS log

Up to [CSRG BSD Unix] / 43BSDTahoe / lib / libc / net

Annotation of 43BSDTahoe/lib/libc/net/rexec.c, revision 1.1.1.1

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: }

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.