81 lines
2.1 KiB
C
81 lines
2.1 KiB
C
/*
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* Copyright (c) 2020-2021 illiliti <illiliti@protonmail.com>
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* SPDX-License-Identifier: ISC
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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*
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* Construct uevent message from environment and send it to 0x4 netlink group.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/socket.h>
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#include <linux/netlink.h>
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int main(int argc, char **argv)
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{
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struct sockaddr_nl sa = {0};
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struct msghdr hdr = {0};
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struct iovec iov = {0};
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extern char **environ;
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char buf[8192];
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size_t len;
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int i, fd;
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iov.iov_base = buf;
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iov.iov_len = 0;
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for (i = 0; environ[i]; i++) {
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if (strncmp(environ[i], "PATH=", 5) == 0 ||
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strncmp(environ[i], "HOME=", 5) == 0) {
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continue;
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}
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len = strlen(environ[i]) + 1;
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if (iov.iov_len + len > sizeof(buf)) {
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fprintf(stderr, "%s: uevent exceeds buffer size", argv[0]);
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return 1;
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}
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memcpy(buf + iov.iov_len, environ[i], len);
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iov.iov_len += len;
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}
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sa.nl_family = AF_NETLINK;
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sa.nl_groups = 0x4; // XXX
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hdr.msg_name = &sa;
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hdr.msg_namelen = sizeof(sa);
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hdr.msg_iov = &iov;
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hdr.msg_iovlen = 1;
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fd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT);
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if (fd == -1) {
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perror("socket");
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return 1;
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}
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if (sendmsg(fd, &hdr, 0) == -1) {
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perror("sendmsg");
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close(fd);
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return 1;
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}
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close(fd);
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return 0;
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}
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