src/tools/srvctrlsocket.c

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2017 Olaf Wintermann. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *
 *   2. Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include "srvctrlsocket.h"

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/un.h>

SrvConnection* srvctrl_connet(char *socketfile) {
    if(!socketfile) {
        fprintf(stderr, "srvctrl_connect: no socketfile\n");
        return NULL;
    }
    size_t len = strlen(socketfile);
    if(len == 0) {
        fprintf(stderr, "srvctrl_connect: invalid socket path\n");
        return NULL;
    }
    if(len > 100) {
        fprintf(stderr, "srvctrl_connect: socket path too long\n");
        return NULL;
    }
    
    int fd = socket(AF_UNIX, SOCK_STREAM, 0);
    if(fd == -1) {
        perror("srvctrl_connect: cannot create socket");
        return NULL;
    }
    
    struct sockaddr_un addr;
    memset(&addr, 0, sizeof(addr));
    addr.sun_family = AF_UNIX;
    memcpy(addr.sun_path, socketfile, len);
    
    if(connect(fd, (struct sockaddr*)&addr, sizeof(addr))) {
        perror("srvctrl_connect");
        close(fd);
        return NULL;
    }
    
    FILE *stream = fdopen(fd, "r+");
    if(!stream) {
        close(fd);
        return NULL;
    }
    
    SrvConnection *conn = calloc(1, sizeof(SrvConnection));
    conn->socket = fd;
    conn->stream = stream;
    
    return conn;
}

void srvctrl_close(SrvConnection *conn) {
    fclose(conn->stream);
    free(conn);
}

int srvctrl_readmsg(SrvConnection *conn, SrvMsg *msg) {
    int type = 0;
    uint16_t length;
    
    type = fgetc(conn->stream);
    if(type == EOF) {
        return 1;
    }
    
    if(fread(&length, 1, 2, conn->stream) != 2) {
        return -1;
    }
    
    msg->type = type;
    msg->length = length;
    msg->message = malloc(length);
    
    size_t r = fread(msg->message, 1, length, conn->stream);
    if(r != length) {
        free(msg->message);
        return -1;
    }
    
    return 0;
}