fastfetch/src/common/networking_linux.c

#include "fastfetch.h"
#include "common/networking.h"

#include <unistd.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <netdb.h>
#include <netinet/in.h> // For FreeBSD
#include <netinet/tcp.h>

static const char* connectAndSend(FFNetworkingState* state)
{
    const char* ret = NULL;
    struct addrinfo* addr;

    if(getaddrinfo(state->host.chars, "80", &(struct addrinfo) {
        .ai_family = AF_INET,
        .ai_socktype = SOCK_STREAM,
    }, &addr) != 0)
    {
        ret = "getaddrinfo() failed";
        goto error;
    }

    state->sockfd = socket(addr->ai_family, addr->ai_socktype, addr->ai_protocol);
    if(state->sockfd == -1)
    {
        freeaddrinfo(addr);
        ret = "socket() failed";
        goto error;
    }

    if (state->timeout > 0)
    {
        FF_MAYBE_UNUSED uint32_t sec = state->timeout / 1000;
        if (sec == 0) sec = 1;

        #ifdef TCP_CONNECTIONTIMEOUT
        setsockopt(state->sockfd, IPPROTO_TCP, TCP_CONNECTIONTIMEOUT, &sec, sizeof(sec));
        #elif defined(TCP_KEEPINIT)
        setsockopt(state->sockfd, IPPROTO_TCP, TCP_KEEPINIT, &sec, sizeof(sec));
        #elif defined(TCP_USER_TIMEOUT)
        setsockopt(state->sockfd, IPPROTO_TCP, TCP_USER_TIMEOUT, &state->timeout, sizeof(state->timeout));
        #endif
    }

    if(connect(state->sockfd, addr->ai_addr, addr->ai_addrlen) == -1)
    {
        close(state->sockfd);
        freeaddrinfo(addr);
        ret = "connect() failed";
        goto error;
    }

    freeaddrinfo(addr);

    if(send(state->sockfd, state->command.chars, state->command.length, 0) < 0)
    {
        close(state->sockfd);
        ret = "send() failed";
        goto error;
    }

    goto exit;

error:
    state->sockfd = -1;

exit:
    ffStrbufDestroy(&state->host);
    ffStrbufDestroy(&state->command);

    return ret;
}

FF_THREAD_ENTRY_DECL_WRAPPER(connectAndSend, FFNetworkingState*);

const char* ffNetworkingSendHttpRequest(FFNetworkingState* state, const char* host, const char* path, const char* headers)
{
    ffStrbufInitS(&state->host, host);

    ffStrbufInitA(&state->command, 64);
    ffStrbufAppendS(&state->command, "GET ");
    ffStrbufAppendS(&state->command, path);
    ffStrbufAppendS(&state->command, " HTTP/1.1\nHost: ");
    ffStrbufAppendS(&state->command, host);
    ffStrbufAppendS(&state->command, "\r\n");
    ffStrbufAppendS(&state->command, headers);
    ffStrbufAppendS(&state->command, "\r\n");

    #ifdef FF_HAVE_THREADS
    if (instance.config.general.multithreading)
    {
        state->thread = ffThreadCreate(connectAndSendThreadMain, state);
        return state->thread ? NULL : "ffThreadCreate(connectAndSend) failed";
    }
    #endif

    return connectAndSend(state);
}

const char* ffNetworkingRecvHttpResponse(FFNetworkingState* state, FFstrbuf* buffer)
{
    uint32_t timeout = state->timeout;

    #ifdef FF_HAVE_THREADS
    if (instance.config.general.multithreading)
    {
        if (!ffThreadJoin(state->thread, timeout))
            return "ffThreadJoin() failed or timeout";
    }
    #endif

    if(state->sockfd == -1)
        return "ffNetworkingSendHttpRequest() failed";

    if(timeout > 0)
    {
        struct timeval timev;
        timev.tv_sec = timeout / 1000;
        timev.tv_usec = (__typeof__(timev.tv_usec)) ((timeout % 1000) * 1000); //milliseconds to microseconds
        setsockopt(state->sockfd, SOL_SOCKET, SO_RCVTIMEO, &timev, sizeof(timev));
    }

    uint32_t recvStart;
    do {
        recvStart = buffer->length;
        ssize_t received = recv(state->sockfd, buffer->chars + buffer->length, ffStrbufGetFree(buffer), 0);
        if (received <= 0) break;
        buffer->length += (uint32_t) received;
        buffer->chars[buffer->length] = '\0';
    } while (ffStrbufGetFree(buffer) > 0 && strstr(buffer->chars + recvStart, "\r\n\r\n") == NULL);

    close(state->sockfd);
    return ffStrbufStartsWithS(buffer, "HTTP/1.1 200 OK\r\n") ? NULL : "Invalid response";
}