61 lines
1.9 KiB
C
61 lines
1.9 KiB
C
/*
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Copyright (c) 2014, Matthias Schiffer <mschiffer@universe-factory.net>
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#define _GNU_SOURCE
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#include <dlfcn.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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static int mark;
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static int (*socket_real)(int domain, int type, int protocol);
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void _init(void) {
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const char *str = getenv("LIBPACKETMARK_MARK");
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if (str)
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mark = atoi(str);
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socket_real = dlsym(RTLD_NEXT, "socket");
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}
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int socket(int domain, int type, int protocol) {
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int fd = socket_real(domain, type, protocol);
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if (fd >= 0) {
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int errno_save = errno;
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setsockopt(fd, SOL_SOCKET, SO_MARK, &mark, sizeof(mark));
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errno = errno_save;
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}
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return fd;
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}
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