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Annotation of 43BSDReno/contrib/mh/uip/ttyw.c, revision 1.1.1.1

1.1       root        1: #ifdef TTYD
                      2: /* ttyw.c - the writer */
                      3: 
                      4: #include <errno.h>
                      5: #include <stdio.h>
                      6: #include <strings.h>
                      7: #include <sys/types.h>
                      8: #include <sys/socket.h>
                      9: #include <netinet/in.h>
                     10: #include <netdb.h>
                     11: #include <arpa/inet.h>
                     12: #include "ttyd.h"
                     13: #include "ttym.c"
                     14: 
                     15: static int getport();
                     16: 
                     17: /*  */
                     18: 
                     19: ttyw(command, host, line, user)
                     20:        char *command, *host, *line, *user;
                     21: {
                     22:     int            privd,
                     23:             sd;
                     24:     unsigned    times;
                     25:     char        buffer[BUFSIZ];
                     26:     struct     hostent *hp;
                     27:     struct     servent *sp;
                     28:     struct sockaddr_in  tty_socket,
                     29:                        *tsock = &tty_socket;
                     30: 
                     31:     if (command == NULL) {
                     32:        errno = EINVAL;
                     33:        return NOTOK;
                     34:     }
                     35: 
                     36:     if ((sp = getservbyname ("ttyserver", "tcp")) == NULL) {
                     37:        errno = ENETDOWN;
                     38:        return NOTOK;
                     39:     }
                     40:     if (host == NULL)
                     41:        (void) gethostname (host = buffer, sizeof buffer);
                     42:     if ((hp = gethostbyname (host))==NULL) {
                     43:        errno = ENETDOWN;
                     44:        return NOTOK;
                     45:     }
                     46: 
                     47:     if (line && strncmp (line, "/dev/", strlen ("/dev/")) == 0)
                     48:        line += strlen ("/dev/");
                     49: 
                     50:     privd = *command >= 'A' && *command <= 'Z';/* crude */
                     51: 
                     52: /*  */
                     53: 
                     54:     for (times = 1; times <= 16; times *= 2) {
                     55:        if ((sd = getport (0, privd)) == NOTOK)
                     56:            return NOTOK;
                     57: 
                     58:        bzero ((char *) tsock, sizeof *tsock);
                     59:        tsock -> sin_family = hp -> h_addrtype;
                     60:        tsock -> sin_port = sp -> s_port;
                     61:        bcopy (hp -> h_addr, (char *) &tsock -> sin_addr, hp -> h_length);
                     62: 
                     63:        if (connect (sd, (struct sockaddr *) tsock, sizeof *tsock) == NOTOK) {
                     64:            (void) close (sd);
                     65:            if (errno == ECONNREFUSED || errno == EINTR) {
                     66:                sleep (times);
                     67:                continue;
                     68:            }
                     69:            break;
                     70:        }
                     71: 
                     72:        ttym (sd, command, line, user, NULL);
                     73:        if (ttyv (sd) == NOTOK || ttyv (sd) == NOTOK) {
                     74:            (void) close (sd);
                     75:            errno = EPERM;      /* what else??? */
                     76:            return NOTOK;
                     77:        }
                     78:        else
                     79:            return sd;
                     80:     }
                     81: 
                     82:     return NOTOK;
                     83: }
                     84: 
                     85: /*  */
                     86: 
                     87: static int
                     88: getport(options, privd)
                     89:        unsigned options;
                     90:        int privd;
                     91: {
                     92:     int     sd,
                     93:             port;
                     94:     struct sockaddr_in  unx_socket,
                     95:                        *usock = &unx_socket;
                     96: 
                     97:     if ((sd = socket (AF_INET, SOCK_STREAM, 0)) == NOTOK)
                     98:        return sd;
                     99: 
                    100:     if (options & SO_DEBUG)
                    101:        (void) setsockopt (sd, SOL_SOCKET, SO_DEBUG, NULL, 0);
                    102:     (void) setsockopt (sd, SOL_SOCKET, SO_KEEPALIVE, NULL, 0);
                    103: 
                    104:     if (!privd)
                    105:        return sd;
                    106: 
                    107:     usock -> sin_family = AF_INET;
                    108:     usock -> sin_addr.s_addr = INADDR_ANY;
                    109: 
                    110:     for (port = IPPORT_RESERVED - 1; port > IPPORT_RESERVED / 2; port--) {
                    111:        usock -> sin_port = htons (port);
                    112: 
                    113:        switch (bind (sd, (struct sockaddr *) usock, sizeof *usock)) {
                    114:            case NOTOK:
                    115:                if (errno != EADDRINUSE && errno != EADDRNOTAVAIL)
                    116:                    return NOTOK;
                    117:                continue;
                    118: 
                    119:            default:
                    120:                return sd;
                    121:        }
                    122:     }
                    123: 
                    124:     return NOTOK;
                    125: }
                    126: #endif TTYD

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