#include #include #include #include #include #define BUFSZ 256 #define SERVICE "daytime" main(argc, argv) int argc; char **argv; { int s, n, len; char buf[BUFSZ]; struct hostent *hp; struct servent *sp; struct sockaddr_in sin; /* * Get a datagram socket in the Internet * domain. */ if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { perror("socket"); exit(1); } /* * Look up the port number of the service. */ if ((sp = getservbyname(SERVICE, "udp")) == NULL) { fprintf(stderr, "%s/udp: unknown service.\n", SERVICE); exit(1); } /* * For each host on the command line... */ while (--argc) { /* * Look up the network number of * the host. */ if ((hp = gethostbyname(*++argv)) == NULL) { fprintf(stderr, "%s: host unknown.\n", *argv); continue; } /* * Build the address of the server on * the remote machine. */ sin.sin_family = AF_INET; sin.sin_port = sp->s_port; bcopy(hp->h_addr, &sin.sin_addr, hp->h_length); /* * Print the name of the host. */ printf("%s: ", *argv); fflush(stdout); /* * Send a datagram to the server. */ if (sendto(s, buf, BUFSZ, 0, &sin, sizeof(sin)) < 0) { perror("sendto"); continue; } /* * Receive a datagram back. */ len = sizeof(sin); n = recvfrom(s, buf, sizeof(buf), 0, &sin, &len); if (n < 0) { perror("recvfrom"); continue; } /* * Print the datagram. */ buf[n] = NULL; printf("%s\n", buf); } close(s); exit(0); } commit diff

path: root/net/ax25/Makefile

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