diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/sendmsg.c')
-rw-r--r-- | sysdeps/unix/sysv/linux/sendmsg.c | 124 |
1 files changed, 0 insertions, 124 deletions
diff --git a/sysdeps/unix/sysv/linux/sendmsg.c b/sysdeps/unix/sysv/linux/sendmsg.c deleted file mode 100644 index 304aa6e2a1..0000000000 --- a/sysdeps/unix/sysv/linux/sendmsg.c +++ /dev/null @@ -1,124 +0,0 @@ -/* Copyright (C) 1998 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Library General Public License as - published by the Free Software Foundation; either version 2 of the - License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Library General Public License for more details. - - You should have received a copy of the GNU Library General Public - License along with the GNU C Library; see the file COPYING.LIB. If not, - write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, - Boston, MA 02111-1307, USA. */ - -#include <sys/socket.h> -#include <errno.h> -#include <stdlib.h> -#include <string.h> -#include <unistd.h> - -#include <asm/posix_types.h> - -/* The kernel expects this structure in SCM_CREDS messages. - * Note: sizeof(struct __kernel_ucred) <= sizeof(struct cmsgcred) must hold. - */ -struct kernel_ucred - { - __kernel_pid_t pid; - __kernel_uid_t uid; - __kernel_gid_t gid; - }; - -struct credmsg - { - struct cmsghdr cm; - struct cmsgcred cc; - }; - -struct kcredmsg - { - struct cmsghdr cm; - struct kernel_ucred cc; - }; - -extern int __syscall_sendmsg (int, const struct msghdr *, int); - -/* Send a message described by MESSAGE on socket FD. - Returns the number of bytes sent, or -1 for errors. */ -int -__libc_sendmsg (int fd, const struct msghdr *message, int flags) -{ - struct msghdr m; - char *buf, *a, *b; - struct credmsg *cred = 0; - struct kcredmsg *kcred; - struct cmsghdr *cm; - long int offset = 0; - pid_t pid; - - /* Preprocess the message control block for SCM_CREDS. */ - if (message->msg_controllen) - { - cm = CMSG_FIRSTHDR (message); - while (cm) - { - if (cm->cmsg_type == SCM_CREDS) - { - if (cred || - cm->cmsg_len < CMSG_LEN (sizeof (struct cmsgcred))) - { - __set_errno (EINVAL); - return -1; - } - else - { - cred = (struct credmsg *) cm; - offset = (char *) cm - (char *) message->msg_control; - } - } - cm = CMSG_NXTHDR ((struct msghdr *) message, cm); - } - - if (cred) - { - buf = alloca (message->msg_controllen); - memcpy (buf, message->msg_control, message->msg_controllen); - kcred = (struct kcredmsg *) (buf + offset); - a = (char *) kcred + CMSG_LEN (sizeof (struct kernel_ucred)); - b = (char *) kcred + CMSG_LEN (sizeof (struct cmsgcred)); - memmove (a, b, message->msg_controllen - (b - buf)); - - kcred->cm.cmsg_len = CMSG_LEN (sizeof (struct kernel_ucred)); - - /* Linux expects the calling process to pass in - its credentials, and sanity checks them. - You can send real, effective, or set- uid and gid. - If the user hasn't filled in the buffer, we default to - real uid and gid. */ - pid = __getpid (); - if (cred->cc.cmcred_pid != pid) - { - kcred->cc.pid = pid; - kcred->cc.uid = __getuid (); - kcred->cc.gid = __getgid (); - } - else - { - kcred->cc.uid = cred->cc.cmcred_uid; - kcred->cc.gid = cred->cc.cmcred_gid; - } - memcpy (&m, message, sizeof (struct msghdr)); - m.msg_control = buf; - m.msg_controllen -= b - a; - return __syscall_sendmsg (fd, &m, flags); - } - } - return __syscall_sendmsg (fd, message, flags); -} - -weak_alias (__libc_sendmsg, sendmsg) |