connection.c
author Markus Bröker <mbroeker@largo.dyndns.tv>
Wed, 02 May 2012 20:51:14 +0200
changeset 165 f551b78c3eee
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permissions -rw-r--r--
a bluetooth and a c++ demo committer: Markus Bröker <mbroeker@largo.homelinux.org>
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/**
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 * tcpconnect.c
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 * Copyright (C) 2010 Markus Broeker
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 */
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <netdb.h>
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#include <arpa/inet.h>
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#include <netinet/in.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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int tcpconnect (char *server, char *port)
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{
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    struct addrinfo hints;
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    struct addrinfo *result, *rp;
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    int sockfd = -1;
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    memset (&hints, 0, sizeof (struct addrinfo));
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    hints.ai_family = AF_UNSPEC;
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    hints.ai_socktype = SOCK_STREAM;
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    hints.ai_flags = 0;
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    hints.ai_protocol = IPPROTO_TCP;
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    if (getaddrinfo (server, port, &hints, &result) != 0) {
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        perror ("getaddrinfo");
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        return -1;
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    }
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    for (rp = result; rp != NULL; rp = rp->ai_next) {
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        if ((sockfd = socket (rp->ai_family, rp->ai_socktype, rp->ai_protocol)) == -1)
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            continue;
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        if (connect (sockfd, rp->ai_addr, rp->ai_addrlen) != -1) {
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            break;
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        }
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        close (sockfd);
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        sockfd = -1;
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    }
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    if (result != NULL)
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        freeaddrinfo (result);
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    return (sockfd);
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}
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char *get (int sockfd, const char *path)
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{
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    char *result, *current;
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    char buffer[1024];
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    int len;
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    int i = 1;
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    len = sprintf (buffer, "GET %s HTTP/1.0\r\n\r\n", path);
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    if (write (sockfd, buffer, len) == -1) {
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        perror ("write");
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        return NULL;
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    }
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    result = malloc (1024);
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    while ((len = read (sockfd, buffer, 1023)) > 0) {
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        buffer[len] = '\0';
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        strcat (result, buffer);
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        if ((current = realloc (result, 1024 * ++i)) == NULL) {
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            break;
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        }
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        result = current;
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    }
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    return result;
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}
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int main (int argc, char **argv)
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{
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    int sockfd;
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    char *result;
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    if (argc != 3) {
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        printf ("Usage: %s <ipaddr> <service>\n", argv[0]);
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        return EXIT_FAILURE;
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    }
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    if ((sockfd = tcpconnect (argv[1], argv[2])) < 0) {
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        printf ("Connection error: %s:%s\n", argv[1], argv[2]);
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        return EXIT_FAILURE;
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    }
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    result = get (sockfd, "/");
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    printf ("RESPONSE: %s", result);
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    if (result)
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        free (result);
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    return close (sockfd);
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}