echo server

[webserver.git] / webserver.c

/* depend: */
/* cflags: */
/* linker: color.o debug.o http.o server.o signal.o */

#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>

#include "debug.h"
#include "http.h"
#include "server.h"
#include "signal.h"

/* types */

/* constants */

#define BUFFER_SIZE 4096

/* macros */

/* gobal variables */

char *progname = NULL;
int port = 8080;
socket_t sock = INVALID_SOCKET;
socket_t conn = INVALID_SOCKET;

/* help function */

int usage (int ret)
{
    FILE *fid = ret ? stderr : stdout;
    fprintf (fid, "usage: %s\n", progname);
    fprintf (fid, " -h : help message\n");
    fprintf (fid, " -p : port number (%d)\n", port);
    fprintf (fid, " -v : verbose level (%d)\n", verbose);

    return ret;
}

void stop_server (__attribute__((unused)) int sig)
{
    if (conn != INVALID_SOCKET) {
        close_socket (conn);
    }
    if (sock != INVALID_SOCKET) {
        close_socket (sock);
    }
    terminate_network_context ();
    exit (0);
}

/* main function */

int main (int argc, char *argv[])
{
    int i = 0;

    /* program name */

    progname = argv[0];
    while (progname[i] != '\0') {
        if ((progname[i] == '/') || (progname[i] == '\\')) {
            progname += i + 1;
            i = 0;
        } else {
            i++;
        }
    }

    /* argument processing */

     while (argc-- > 1) {
        char *arg = *(++argv);
        if (arg[0] != '-') {
            VERBOSE (ERROR, PERROR ("%s: invalid option -- '%s'\n", progname, arg); usage (1));
            return 1;
        }
        char c = arg[1];
        switch (c) {
            case 'p':
            arg = (arg[2]) ? arg + 2 : (--argc > 0) ? *(++argv) : NULL;
            if (arg == NULL) {
                VERBOSE (ERROR, PERROR ("%s: missing port number\n", progname); usage (1));
                return 1;
            }
            port = atoi (arg);
            if (port <= 0) {
                VERBOSE (ERROR, PERROR ("%s: incorrect port number (%s)\n", progname, arg); usage (1));
                return 1;
            }
            break;
        case 'v':
            arg = (arg[2]) ? arg + 2 : (--argc > 0) ? *(++argv) : NULL;
            if (arg == NULL) {
                VERBOSE (ERROR, PERROR ("%s: missing verbose level\n", progname); usage (1));
                return 1;
            }
            verbose = atoi (arg);
            break;
        case 'h':
        default:
            return usage (c != 'h');
        }
    }

    VERBOSE (DEBUG, PRINT ("Initializing socket\n"));
    init_network_context ();
    sock = open_listening_socket (port);
    if (sock == INVALID_SOCKET) {
        VERBOSE (ERROR, PERROR ("Can't open listening socket\n"));
        return 1;
    }
    VERBOSE (INFO, PRINT ("Listening socket on port %d\n", port));

    signal (SIGTERM, &stop_server);

    /* main loop */
    while (1) {
        conn = accept_incoming_connection (sock);
        if (conn == INVALID_SOCKET) {
            usleep (1e5);
            continue;
        }

        VERBOSE (DEBUG, PRINT ("Server connected, waiting for data\n"));

        unsigned char *data = {0};

        int len = receive_data (conn, &data);
        if (len == 0) {
            VERBOSE (WARNING, PRINT ("Connection closed by peer (rx)\n"));
        } else if (len < 0) {
            VERBOSE (WARNING, PRINT ("Connection in error (rx)\n"));
        } else {
            VERBOSE (DEBUG, PRINT ("Received %d bytes\n", len));

            // processing
            VERBOSE (DEBUG, PRINT ("Processing %s\n", data));
            len = processing (data, len, &data);

            int rc = send_data (conn, data, len);
            if (rc == 0) {
                VERBOSE (WARNING, PRINT ("Connection closed by peer (tx)\n"));
            } else if (rc < 0) {
                VERBOSE (WARNING, PRINT ("Connection in error (tx)\n"));
            }
        }

        VERBOSE (DEBUG, PRINT ("Closing connection\n"));
        if (data) {
            free (data);
        }
        close_socket (conn);
        conn = INVALID_SOCKET;
    }
    
    VERBOSE (DEBUG, PRINT ("Closing socket\n"));
    close_socket (sock);
    terminate_network_context ();

    return 2;
}

// test: webserver.exe -h
// test: webserver.exe -h | awk '/usage:/ { rc=1 } END { exit (1-rc) }'
// test: webserver.exe -_ 2> /dev/null | wc -l | xargs test 0 =
// test: webserver.exe -_ 2>&1 | awk '/usage:/ { rc=1 } END { exit (1-rc) }'
// test: webserver.exe error 2>&1 | grep -q 'invalid option'
// test: webserver.exe -v 2>&1 | grep -q 'missing verbose level'
// test: webserver.exe -p 2>&1 | grep -q 'missing port number'
// test: webserver.exe -p -1 2>&1 | grep -q 'incorrect port number'
// test: webserver.exe > test.log & pid=$!; sleep 1; kill -9 $pid; grep -q 'Listening socket on port 8080' test.log
// test: webserver.exe -p 8000 > test.log & pid=$!; sleep 1; kill -9 $pid; grep -q 'Listening socket on port 8000' test.log
// test: webserver.exe & pid=$!; sleep 1; kill -TERM $pid; ps aux | grep -q [w]ebserver.exe && kill -9 $pid || rc=1; test x$rc = x1

/* vim: set ts=4 sw=4 et: */