75 lines
1.6 KiB
C
75 lines
1.6 KiB
C
/* @(#)tcpd.c 1.1 97/01/03 Connectathon Testsuite */
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/*
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* server for simple tcp ping program.
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* listens on socket for connection request, then echos back
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* request from client.
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*/
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#define TCP_PORT 3456
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <netdb.h>
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main(argc, argv)
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char **argv;
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{
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int s, ns; /* sockets */
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struct sockaddr_in addr; /* socket address */
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int ret;
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int addrlen = sizeof(struct sockaddr_in);
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struct hostent *hp;
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char buf[BUFSIZ];
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if ((s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
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xxit("socket");
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addr.sin_family = AF_INET;
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addr.sin_port = htons(TCP_PORT);
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addr.sin_addr.s_addr = INADDR_ANY;
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if (bind(s, (struct sockaddr *)&addr, addrlen) < 0)
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xxit("bind");
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if (listen(s, 5) < 0)
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xxit("listen");
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while(1) {
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fprintf(stderr, "%s awaiting accept\n", argv[0]);
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addrlen = sizeof(struct sockaddr_in);
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if ((ns = accept(s, (struct sockaddr *)&addr, &addrlen)) < 0)
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xxit("accept");
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#ifdef __STDC__
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if (hp = gethostbyaddr((const char *)&addr.sin_addr,
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sizeof(addr.sin_addr), AF_INET))
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#else
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if (hp = gethostbyaddr(&addr.sin_addr, sizeof(addr.sin_addr),
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AF_INET))
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#endif
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fprintf(stderr, "\
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%s: accepted connection from host %s\n", argv[0], hp->h_name);
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else
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fprintf(stderr, "\
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%s: accepted connection from host %x\n", argv[0], addr.sin_addr.s_addr);
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ret = read(ns, buf, BUFSIZ);
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fprintf(stderr, " read ret %d\n", ret);
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if (ret > 0) {
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*buf = *buf + 1;
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ret = write(ns, buf, ret);
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fprintf(stderr, " write ret %d\n", ret);
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}
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sleep(5);
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close(ns);
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}
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}
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xxit(s)
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char *s;
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{
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perror(s);
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exit(1);
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}
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