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Annotation of researchv10no/cmd/dist/sgi/connect.c, revision 1.1

1.1     ! root        1: /* usage: connect hostname (answer|send|notice) (in|out) program [ args ... ] */
        !             2: /* TODO: should librarify the bit for opening an rsh-authenticated connection.  */
        !             3: 
        !             4: #include <sys/types.h>
        !             5: #include <sys/socket.h>
        !             6: #include <netinet/in.h>
        !             7: #include <netdb.h>
        !             8: #include <pwd.h>
        !             9: #include <stdio.h>
        !            10: #include <string.h>
        !            11: #include "../paths.h"
        !            12: 
        !            13: int
        !            14: main(int argc, char *argv[])
        !            15: {
        !            16:        int fd;
        !            17:        struct hostent *host;
        !            18:        struct servent *serv;
        !            19:        struct passwd *pw;
        !            20:        int lport;
        !            21:        struct sockaddr_in sin;
        !            22:        char byte;
        !            23: 
        !            24:        if (argc < 5)
        !            25:                exit(1);
        !            26: 
        !            27:        host = gethostbyname(argv[1]);
        !            28:        if (!host) {
        !            29:                fprintf(stderr, "connect: can't get host '%s'\n", argv[1]);
        !            30:                exit(1);
        !            31:        }
        !            32: 
        !            33:        serv = getservbyname("dist", "tcp");
        !            34:        if (!serv) {
        !            35:                fprintf(stderr, "connect: can't get 'dist' port number\n");
        !            36:                exit(1);
        !            37:        }
        !            38: 
        !            39:        pw = getpwuid(getuid());        /* we assume unique uid/name map */
        !            40:        if (!pw) {
        !            41:                fprintf(stderr, "connect: can't get user name\n");
        !            42:                exit(1);
        !            43:        }
        !            44: 
        !            45:        chdir(SDIR);
        !            46: 
        !            47:        lport = 1023;
        !            48:        fd = rresvport(&lport);
        !            49:        if (fd < 0) {
        !            50:                perror("connect: getting socket");
        !            51:                exit(1);
        !            52:        }
        !            53: 
        !            54:        sin.sin_family = host->h_addrtype;
        !            55:        memcpy(&sin.sin_addr, host->h_addr, host->h_length);
        !            56:        sin.sin_port = serv->s_port;
        !            57:        if (connect(fd, &sin, sizeof sin) < 0) {
        !            58:                perror("connect: opening connection");
        !            59:                exit(1);
        !            60:        }
        !            61: 
        !            62:        write(fd, "", 1);       /* a NUL byte */
        !            63:        write(fd, pw->pw_name, strlen(pw->pw_name) + 1);
        !            64:        write(fd, pw->pw_name, strlen(pw->pw_name) + 1);
        !            65:        if (read(fd, &byte, 1) != 1 || byte != '\0') {
        !            66:                fprintf(stderr, "connect: rsh authentication failed\n");
        !            67:                exit(1);
        !            68:        }
        !            69: 
        !            70:        write(fd, argv[2], strlen(argv[2]) + 1);
        !            71: 
        !            72:        if (strchr(argv[3], 'i'))
        !            73:                dup2(fd, 0);
        !            74:        if (strchr(argv[3], 'o'))
        !            75:                dup2(fd, 1);
        !            76:        close(fd);
        !            77:        execv(argv[4], &argv[4]);
        !            78: }

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