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Annotation of 43BSD/contrib/nntp/xmit/get_tcp_conn.c, revision 1.1

1.1     ! root        1: #include <sys/types.h>
        !             2: #include <sys/socket.h>
        !             3: #include <netinet/in.h>
        !             4: #include <ctype.h>
        !             5: #include <netdb.h>
        !             6: #include "get_tcp_conn.h"
        !             7: 
        !             8: extern int     errno;
        !             9: 
        !            10: /*
        !            11: ** Take the name of an internet host in ASCII (this may either be its
        !            12: ** official host name or internet number (with or without enclosing
        !            13: ** backets [])), and return the internet address number in 32 bit quantity.
        !            14: **
        !            15: ** returns FAIL for failure to find the host name in the local database,
        !            16: ** or for a bad internet address spec.
        !            17: */
        !            18: u_long
        !            19: name_to_address(host)
        !            20: register char  *host;
        !            21: {
        !            22:        if (host == (char *)NULL)
        !            23:                return(FAIL);
        !            24: 
        !            25:        /*
        !            26:        ** Is this an ASCII internet address? (either of [10.0.0.78] or
        !            27:        ** 10.0.0.78).
        !            28:        */
        !            29:        if (*host == '[' || isdigit(*host)) {
        !            30:                u_long  host_address;
        !            31:                char    namebuf[128];
        !            32:                register char   *cp = namebuf;
        !            33: 
        !            34:                /*
        !            35:                ** strip brackets [] or anything else we don't want.
        !            36:                */
        !            37:                while(*host && cp < &namebuf[sizeof(namebuf)]) {
        !            38:                        if (isdigit(*host) || *host == '.')
        !            39:                                *cp++ = *host++;
        !            40:                        else
        !            41:                                host++;
        !            42:                }
        !            43: 
        !            44:                if ((host_address = inet_addr(namebuf)) == FAIL)
        !            45:                        return(FAIL);   /* malformed internet address spec */
        !            46:                return(host_address);
        !            47:        } else {
        !            48:                struct hostent  *hstp = gethostbyname(host);
        !            49: 
        !            50:                if (hstp == NULL)
        !            51:                        return(FAIL);   /* no such host */
        !            52:                return(*(u_long *)hstp->h_addr);        /* we assume... */
        !            53:        }
        !            54: }
        !            55: 
        !            56: /*
        !            57: ** given a host name (either name or internet address) and service name
        !            58: ** (or port number) (both in ASCII), give us a TCP connection to the
        !            59: ** requested service at the requested host (or give us FAIL).
        !            60: */
        !            61: get_tcp_conn(host,serv)
        !            62: char   *host;
        !            63: char   *serv;
        !            64: {
        !            65:        u_short port;
        !            66:        struct in_addr  host_address;
        !            67: 
        !            68:        if ((host_address.s_addr = name_to_address(host)) == FAIL) {
        !            69:                return(NOHOST);
        !            70:        }
        !            71: 
        !            72:        if (isdigit(*serv)) {
        !            73:                port = htons((u_short)(atoi(serv)));
        !            74:        } else {
        !            75:                struct servent  *srvp = getservbyname(serv, "tcp");
        !            76: 
        !            77:                if (srvp == NULL) {
        !            78:                        return(NOSERVICE);
        !            79:                }
        !            80:                port = (u_short)srvp->s_port;
        !            81:        }
        !            82: 
        !            83:        return(mkconn(&host_address, port, IPPROTO_TCP, SOCK_STREAM));
        !            84: }
        !            85: 
        !            86: /*
        !            87: ** create a socket and connect it to a remote host on the specified
        !            88: ** port by the specified protocol. Return FAIL if something goes
        !            89: ** wrong somewhere. Since these are exclusively system calls,
        !            90: ** errno will have the correct error in it.
        !            91: */
        !            92: mkconn(host_address, port, protocol, proto_type)
        !            93: struct in_addr *host_address;
        !            94: u_short        port;
        !            95: int    protocol, proto_type;
        !            96: {
        !            97:        register int    skt;
        !            98:        struct sockaddr_in      sadr;
        !            99: 
        !           100:        sadr.sin_family = (u_short)AF_INET;     /* Only internet for now */
        !           101:        sadr.sin_addr.s_addr = host_address->s_addr;
        !           102:        sadr.sin_port = (u_short)port;
        !           103: 
        !           104:        if ((skt = socket(AF_INET, proto_type, protocol)) < 0)
        !           105:                return(FAIL);
        !           106: 
        !           107:        if (connect(skt, &sadr, sizeof(sadr)) < 0) {
        !           108:                int     save = errno;
        !           109: 
        !           110:                close(skt);
        !           111:                errno = save;
        !           112:                return(FAIL);
        !           113:        }
        !           114:        return(skt);
        !           115: }

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