socket_post.c

/**
 * client.c -- a stream socket client demo
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <netdb.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/stat.h>

#include <arpa/inet.h>

#define PORT "80" // the port client will be connecting to 

#define MAXDATASIZE 200 // max number of bytes we can get at once 

// get sockaddr, IPv4 or IPv6:
void *get_in_addr(struct sockaddr *sa)
{
    if (sa->sa_family == AF_INET) {
        return &(((struct sockaddr_in*)sa)->sin_addr);
    }

    return &(((struct sockaddr_in6*)sa)->sin6_addr);
}

int main(int argc, char *argv[])
{
    int sockfd, numbytes;  
    char buf[MAXDATASIZE];
    struct addrinfo hints, *servinfo, *p;
    int rv;
    char s[INET6_ADDRSTRLEN];

    FILE *fin;
    unsigned char *file_contents;
    size_t bytes_read;
    struct stat sb;

    char *query;
    char *tpl = "POST /speech-api/v1/recognize?xjerr=1&pfilter=1&client=chromium&lang=ru-RU HTTP/1.1\r\nHost: www.google.com\r\nUser-Agent: fedor\r\nConnection: close\r\nContent-Type: audio/x-speex-with-header-byte; rate=16000\r\nContent-Length: %d\r\n\r\n";

    if (stat("record_speech", &sb) != 0){
        return -1;
    }
 
    file_contents = malloc(sb.st_size);
 
    fin = fopen("record_speech", "r");

    bytes_read = fread(file_contents, sizeof(unsigned char), sb.st_size, fin);

    query = (char *)malloc(strlen(tpl));
    
    sprintf(query, tpl, bytes_read);
    printf("%s", query);
    

    memset(&hints, 0, sizeof hints);
    hints.ai_family = AF_UNSPEC;
    hints.ai_socktype = SOCK_STREAM;

    if ((rv = getaddrinfo("www.google.com", PORT, &hints, &servinfo)) != 0) {
        fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(rv));
        return 1;
    }

    // loop through all the results and connect to the first we can
    for(p = servinfo; p != NULL; p = p->ai_next) {
        if ((sockfd = socket(p->ai_family, p->ai_socktype,
                p->ai_protocol)) == -1) {
            perror("client: socket");
            continue;
        }

        if (connect(sockfd, p->ai_addr, p->ai_addrlen) == -1) {
            close(sockfd);
            perror("client: connect");
            continue;
        }

        break;
    }

    if (p == NULL) {
        fprintf(stderr, "client: failed to connect\n");
        return 2;
    }

    inet_ntop(p->ai_family, get_in_addr((struct sockaddr *)p->ai_addr),
            s, sizeof s);
    printf("client: connecting to %s\n", s);

    freeaddrinfo(servinfo); // all done with this structure

    // send http query
    if ((numbytes=send(sockfd, query, strlen(query), 0)) == -1) {
        perror("sendto");
        exit(1);
    }
    // send buffer
    if ((numbytes=send(sockfd, file_contents, bytes_read, 0)) == -1) {
        perror("sendto");
        exit(1);
    }

    while ((numbytes = recv(sockfd, buf, MAXDATASIZE-1, 0)) > 0) {
        buf[numbytes] = '\0';

        printf("%s\n", buf);
    }

    close(sockfd);

    return 0;
}