privsock.c
上传用户:ig0539
上传日期:2022-05-21
资源大小:181k
文件大小:4k
- /*
- * Part of Very Secure FTPd
- * Licence: GPL v2
- * Author: Chris Evans
- * privsock.c
- *
- * This file contains code for a simple message and file descriptor passing
- * API, over a pair of UNIX sockets.
- * The messages are typically travelling across a privilege boundary, with
- * heavy distrust of messages on the side of more privilege.
- */
- #include "privsock.h"
- #include "utility.h"
- #include "defs.h"
- #include "str.h"
- #include "netstr.h"
- #include "sysutil.h"
- #include "sysdeputil.h"
- #include "session.h"
- void
- priv_sock_init(struct vsf_session* p_sess)
- {
- struct vsf_sysutil_socketpair_retval retval;
- if (p_sess->parent_fd != -1)
- {
- bug("parent_fd active");
- }
- if (p_sess->child_fd != -1)
- {
- bug("child_fd active");
- }
- retval = vsf_sysutil_unix_stream_socketpair();
- p_sess->parent_fd = retval.socket_one;
- p_sess->child_fd = retval.socket_two;
- }
- void
- priv_sock_close(struct vsf_session* p_sess)
- {
- if (p_sess->parent_fd != -1)
- {
- vsf_sysutil_close(p_sess->parent_fd);
- p_sess->parent_fd = -1;
- }
- if (p_sess->child_fd != -1)
- {
- vsf_sysutil_close(p_sess->child_fd);
- p_sess->child_fd = -1;
- }
- }
- void
- priv_sock_set_parent_context(struct vsf_session* p_sess)
- {
- if (p_sess->child_fd == -1)
- {
- bug("child_fd not active");
- }
- vsf_sysutil_close(p_sess->child_fd);
- p_sess->child_fd = -1;
- }
- void
- priv_sock_set_child_context(struct vsf_session* p_sess)
- {
- if (p_sess->parent_fd == -1)
- {
- bug("parent_fd not active");
- }
- vsf_sysutil_close(p_sess->parent_fd);
- p_sess->parent_fd = -1;
- }
- void
- priv_sock_send_cmd(int fd, char cmd)
- {
- int retval = vsf_sysutil_write_loop(fd, &cmd, sizeof(cmd));
- if (retval != sizeof(cmd))
- {
- die("priv_sock_send_cmd");
- }
- }
- void
- priv_sock_send_str(int fd, const struct mystr* p_str)
- {
- unsigned int len = str_getlen(p_str);
- priv_sock_send_int(fd, (int) len);
- if (len > 0)
- {
- str_netfd_write(p_str, fd);
- }
- }
- void
- priv_sock_send_buf(int fd, const char* p_buf, unsigned int len)
- {
- priv_sock_send_int(fd, (int) len);
- if (len > 0)
- {
- if (vsf_sysutil_write_loop(fd, p_buf, len) != (int) len)
- {
- die("priv_sock_send_buf");
- }
- }
- }
- void
- priv_sock_recv_buf(int fd, char* p_buf, unsigned int len)
- {
- unsigned int recv_len = (unsigned int) priv_sock_get_int(fd);
- if (recv_len > len)
- {
- bug("recv_len bigger than buffer");
- }
- if (recv_len > 0)
- {
- if (vsf_sysutil_read_loop(fd, p_buf, recv_len) != (int) recv_len)
- {
- die("priv_sock_recv_buf");
- }
- }
- }
- char
- priv_sock_get_result(int fd)
- {
- char res;
- int retval = vsf_sysutil_read_loop(fd, &res, sizeof(res));
- if (retval != sizeof(res))
- {
- die("priv_sock_get_result");
- }
- return res;
- }
- char
- priv_sock_get_cmd(int fd)
- {
- char res;
- int retval = vsf_sysutil_read_loop(fd, &res, sizeof(res));
- if (retval != sizeof(res))
- {
- die("priv_sock_get_cmd");
- }
- return res;
- }
- void
- priv_sock_get_str(int fd, struct mystr* p_dest)
- {
- unsigned int len = (unsigned int) priv_sock_get_int(fd);
- if (len > VSFTP_PRIVSOCK_MAXSTR)
- {
- die("priv_sock_get_str: too big");
- }
- str_empty(p_dest);
- if (len > 0)
- {
- int retval = str_netfd_read(p_dest, fd, len);
- if ((unsigned int) retval != len)
- {
- die("priv_sock_get_str: read error");
- }
- }
- }
- void
- priv_sock_send_result(int fd, char res)
- {
- int retval = vsf_sysutil_write_loop(fd, &res, sizeof(res));
- if (retval != sizeof(res))
- {
- die("priv_sock_send_result");
- }
- }
- void
- priv_sock_send_fd(int fd, int send_fd)
- {
- vsf_sysutil_send_fd(fd, send_fd);
- }
- int
- priv_sock_recv_fd(int fd)
- {
- return vsf_sysutil_recv_fd(fd);
- }
- void
- priv_sock_send_int(int fd, int the_int)
- {
- int retval = vsf_sysutil_write_loop(fd, &the_int, sizeof(the_int));
- if (retval != sizeof(the_int))
- {
- die("priv_sock_send_int");
- }
- }
- int
- priv_sock_get_int(int fd)
- {
- int the_int;
- int retval = vsf_sysutil_read_loop(fd, &the_int, sizeof(the_int));
- if (retval != sizeof(the_int))
- {
- die("priv_sock_get_int");
- }
- return the_int;
- }