privsock.c

#include "privsock.h"
#include "common.h"
#include "sysutil.h"

void priv_sock_init(session_t *sess)
{
    int sockfd[2];
    if (socketpair(AF_UNIX, SOCK_STREAM, 0, sockfd) < 0)
        err_sys("socketpair");

    sess->parent_fd = sockfd[0];
    sess->child_fd = sockfd[1];
}

void priv_sock_close(session_t *sess)
{
    if (sess->child_fd != -1)
    {
        close(sess->child_fd);
        sess->child_fd = -1;
    }
    if (sess->parent_fd != -1)
    {
        close(sess->parent_fd);
        sess->parent_fd = -1;
    }
}

void priv_sock_set_parent_context(session_t *sess)
{
    if (sess->child_fd != -1)
    {
        close(sess->child_fd);
        sess->child_fd = -1;
    }
}

void priv_sock_set_child_context(session_t *sess)
{
    if (sess->parent_fd != -1)
    {
        close(sess->parent_fd);
        sess->parent_fd = -1;
    }
}

void priv_sock_send_cmd(int fd, char cmd)
{
    int ret;
    ret = writen(fd, &cmd, sizeof(cmd));
    if (ret != sizeof(cmd))
    {
        fprintf(stderr, "priv_sock_send_cmd error\n");
        exit(EXIT_FAILURE);
    }
}

char priv_sock_get_cmd(int fd)
{
    char res;
    int ret;
    ret = readn(fd, &res, sizeof(res));
    if (ret == 0)
    {
        printf("ftp process exit\n");
        exit(EXIT_SUCCESS);
    }
    if (ret != sizeof(res))
    {
        fprintf(stderr, "priv_sock_get_cmd error\n");
        exit(EXIT_FAILURE);
    }

    return res;
}

void priv_sock_send_result(int fd, char res)
{
     int ret;
    ret = writen(fd, &res, sizeof(res));
    if (ret != sizeof(res))
    {
        fprintf(stderr, "priv_sock_send_result error\n");
        exit(EXIT_FAILURE);
    }

}

char priv_sock_get_result(int fd)
{
    char res;
    int ret;
    ret = readn(fd, &res, sizeof(res));
    if (ret != sizeof(res))
    {
        fprintf(stderr, "priv_sock_get_result error\n");
        exit(EXIT_FAILURE);
    }

    return res;
}

void priv_sock_send_int(int fd, int the_int)
{
    int ret;
    ret = writen(fd, &the_int, sizeof(the_int));
    if (ret != sizeof(the_int))
    {
        fprintf(stderr, "priv_sock_send_in error\n");
        exit(EXIT_FAILURE);
    }
}

int priv_sock_get_int(int fd)
{
    int res, ret;
    ret = readn(fd, &res, sizeof(res));
    if (ret != sizeof(res))
    {
        fprintf(stderr, "priv_sock_get_int error\n");
        exit(EXIT_FAILURE);
    }

    return res;
}

void priv_sock_send_buf(int fd, const char *buf, unsigned int len)
{
    priv_sock_send_int(fd, (int)len);
    int ret = writen(fd, buf, len);
    if (ret != (int)len)
    {
        fprintf(stderr, "priv_sock_send_buf error\n");
        exit(EXIT_FAILURE);
    }
}

void priv_sock_recv_buf(int fd, char *buf, unsigned int len)
{
    unsigned int recv_len = (unsigned int)priv_sock_get_int(fd);
    if (recv_len > len)
    {
        fprintf(stderr, "priv_sock_recv_buf error\n");
        exit(EXIT_FAILURE);
    }

    int ret = readn(fd, buf, recv_len);
    if (ret != (int)recv_len)
    {
        fprintf(stderr, "priv_sock_recv_buf error\n");
        exit(EXIT_FAILURE);
    }
}

void priv_sock_send_fd(int sock_fd, int fd)
{
    send_fd(sock_fd, fd);
}

int priv_sock_recv_fd(int sock_fd)
{
    return recv_fd(sock_fd, NULL);
}