136 lines
3.0 KiB
C
136 lines
3.0 KiB
C
/*
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* SCM_RIGHTS with unix socket help program for test
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*
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* Copyright IBM, Inc. 2013
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*
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* Authors:
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* Wenchao Xia <xiawenc@linux.vnet.ibm.com>
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*
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* This work is licensed under the terms of the GNU LGPL, version 2 or later.
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* See the COPYING.LIB file in the top-level directory.
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*/
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#include <stdio.h>
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#include <errno.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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/* #define SOCKET_SCM_DEBUG */
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/*
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* @fd and @fd_to_send will not be checked for validation in this function,
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* a blank will be sent as iov data to notify qemu.
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*/
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static int send_fd(int fd, int fd_to_send)
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{
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struct msghdr msg;
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struct iovec iov[1];
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int ret;
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char control[CMSG_SPACE(sizeof(int))];
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struct cmsghdr *cmsg;
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memset(&msg, 0, sizeof(msg));
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memset(control, 0, sizeof(control));
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/* Send a blank to notify qemu */
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iov[0].iov_base = (void *)" ";
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iov[0].iov_len = 1;
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msg.msg_iov = iov;
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msg.msg_iovlen = 1;
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msg.msg_control = control;
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msg.msg_controllen = sizeof(control);
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cmsg = CMSG_FIRSTHDR(&msg);
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cmsg->cmsg_len = CMSG_LEN(sizeof(int));
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cmsg->cmsg_level = SOL_SOCKET;
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cmsg->cmsg_type = SCM_RIGHTS;
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memcpy(CMSG_DATA(cmsg), &fd, sizeof(int));
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do {
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ret = sendmsg(fd, &msg, 0);
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} while (ret < 0 && errno == EINTR);
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if (ret < 0) {
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fprintf(stderr, "Failed to send msg, reason: %s\n", strerror(errno));
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}
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return ret;
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}
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/* Convert string to fd number. */
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static int get_fd_num(const char *fd_str)
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{
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int sock;
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char *err;
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errno = 0;
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sock = strtol(fd_str, &err, 10);
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if (errno) {
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fprintf(stderr, "Failed in strtol for socket fd, reason: %s\n",
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strerror(errno));
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return -1;
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}
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if (!*fd_str || *err || sock < 0) {
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fprintf(stderr, "bad numerical value for socket fd '%s'\n", fd_str);
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return -1;
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}
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return sock;
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}
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/*
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* To make things simple, the caller needs to specify:
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* 1. socket fd.
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* 2. path of the file to be sent.
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*/
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int main(int argc, char **argv, char **envp)
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{
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int sock, fd, ret;
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#ifdef SOCKET_SCM_DEBUG
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int i;
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for (i = 0; i < argc; i++) {
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fprintf(stderr, "Parameter %d: %s\n", i, argv[i]);
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}
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#endif
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if (argc != 3) {
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fprintf(stderr,
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"Usage: %s < socket-fd > < file-path >\n",
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argv[0]);
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return EXIT_FAILURE;
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}
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sock = get_fd_num(argv[1]);
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if (sock < 0) {
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return EXIT_FAILURE;
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}
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/* Now only open a file in readonly mode for test purpose. If more precise
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control is needed, use python script in file operation, which is
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supposed to fork and exec this program. */
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fd = open(argv[2], O_RDONLY);
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if (fd < 0) {
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fprintf(stderr, "Failed to open file '%s'\n", argv[2]);
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return EXIT_FAILURE;
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}
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ret = send_fd(sock, fd);
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if (ret < 0) {
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close(fd);
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return EXIT_FAILURE;
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}
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close(fd);
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return EXIT_SUCCESS;
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}
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