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Annotation of 43BSDReno/sys/nfs/TEST/unix-tests/tools/udpd.c, revision 1.1

1.1     ! root        1: /*     @(#)udpd.c      1.1 88/10/12 NFS Rev 2 Testsuite        */
        !             2: /*
        !             3:  *  server for simple udp ping program.
        !             4:  *  listens on socket for request, then echos back
        !             5:  *  request from client.
        !             6:  */
        !             7: #define UDP_PORT        3457
        !             8: 
        !             9: #include <stdio.h>
        !            10: #include <sys/types.h>
        !            11: #include <sys/socket.h>
        !            12: #include <netinet/in.h>
        !            13: #include <netdb.h>
        !            14: 
        !            15: main(argc, argv)
        !            16: char **argv;
        !            17: {
        !            18:        int s;                          /* socket */
        !            19:        struct sockaddr_in addr;        /* socket address */
        !            20:        int ret;
        !            21:        int addrlen = sizeof(struct sockaddr_in);
        !            22:        struct hostent *hp;
        !            23:        char buf[BUFSIZ];
        !            24: 
        !            25:        if ((s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
        !            26:                xxit("socket");
        !            27: 
        !            28:        addr.sin_family = AF_INET;
        !            29:        addr.sin_port = htons(UDP_PORT);
        !            30:        addr.sin_addr.s_addr = INADDR_ANY;
        !            31: 
        !            32:        if (bind(s, &addr, addrlen) < 0)
        !            33:                xxit("bind");
        !            34: 
        !            35:        while(1) {
        !            36:                fprintf(stderr, "%s awaiting request\n", argv[0]);
        !            37:                addrlen = sizeof(struct sockaddr_in);
        !            38:                ret = recvfrom(s, buf, BUFSIZ, 0, &addr, &addrlen);
        !            39:                if (ret < 0)
        !            40:                        xxit("recvfrom");
        !            41:                if (hp = gethostbyaddr(&addr.sin_addr, sizeof(addr.sin_addr),
        !            42:                                        AF_INET))
        !            43:                        fprintf(stderr, "\
        !            44: %s: accepted request from host %s\n", argv[0], hp->h_name);
        !            45:                else
        !            46:                        fprintf(stderr, "\
        !            47: %s: accepted request from host %x\n", argv[0], addr.sin_addr.s_addr);
        !            48: 
        !            49:                fprintf(stderr, " recvfrom ret %d\n", ret);
        !            50:                if (ret > 0) {
        !            51:                        *buf = *buf + 1;
        !            52:                        ret = sendto(s, buf, ret, 0, &addr, addrlen);
        !            53:                        fprintf(stderr, " sendto ret %d\n", ret);
        !            54:                }
        !            55:        }
        !            56: }
        !            57: 
        !            58: xxit(s)
        !            59: char *s;
        !            60: {
        !            61:        perror(s);
        !            62:        exit(1);
        !            63: }
        !            64: 

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