Simple HTTP client in C

http_client.c

#include <stdio.h>
#include <string.h>

#include <sys/socket.h>
#include <arpa/inet.h>   

#include <unistd.h>

#include <stdlib.h>

/************************************************************************************************
*  Try it out:
*  $ git clone https://gist.github.com/5202810.git http_client
*  $ cd http_client
*  $ python -m SimpleHTTPServer 
*  $ make
*  $ ./http_client  
*
************************************************************************************************/



/************************************************************************************************
*   Blocking call to send HTTP Request and Get Response.
*
*   'request' must contain necessary http request data including http version, method and data
*   'response' is allocated dynamically by the function. Must be freed by caller
*
*   Output: 0  - FAILURE in creating sockets/sending data
*           1  - SUCCESS
*
************************************************************************************************/

#define RECV_SIZE 1024

int sendHttpDataAndGetResponse(const char* ipAddress, int port, char* request, char** response) 
{
    
    int socketDesc;
    struct sockaddr_in server;

    char* recvData = calloc(RECV_SIZE, 1);

    socketDesc = socket(AF_INET , SOCK_STREAM , 0);
    if (socketDesc == -1)
    {
        printf("%s Could not create socket\n", __FUNCTION__);
        return 0;
    }

    server.sin_addr.s_addr = inet_addr(ipAddress);
    server.sin_family = AF_INET;
    server.sin_port = htons(port);

    if(connect(socketDesc , (struct sockaddr *)&server , sizeof(server)) < 0)
    {
        puts("connect error");
        return 0;
    }

    if(send(socketDesc , request , strlen(request) , 0) < 0)
    {
        printf("%s Send failed\n", __FUNCTION__);
        return 0;
    }
    
    int iteration = 1;
    char* intermediateData = recvData;
    while(recv(socketDesc, intermediateData, RECV_SIZE, 0) > 0)
    {   
        //printf("intermediateData %s\n", intermediateData);
        iteration += 1;
        recvData = realloc(recvData, iteration*RECV_SIZE);
        memset(recvData+(iteration-1)*RECV_SIZE, 0, RECV_SIZE);
        //intermediateData = recvData + (iteration-1)*RECV_SIZE-1;
        intermediateData = recvData + strlen(recvData);



    }
    close(socketDesc);
    
    *response = recvData;
    return 1;

}


int main() 
{
    
    char* response = NULL;
    sendHttpDataAndGetResponse("0.0.0.0", 8000, "GET /Makefile HTTP/1.1\r\n\r\n", &response);
    printf("Response received\n %s\n", response);
    free(response);
    
    sendHttpDataAndGetResponse("0.0.0.0", 8000, "GET / HTTP/1.1\r\n\r\n", &response);
    printf("Second response\n %s\n", response);
    free(response);

    return 0;

}

Makefile

all:
	gcc -Wall http_client.c -o http_client

clean:
	rm *.o;rm http_client