Attachment 686801 Details for Bug 887992 – Test app using basic socket calls

Test app using basic socket calls

audit-multicast-listen.c (text/x-csrc), 2.32 KB, created by Richard Guy Briggs on 2013-01-24 14:29:36 UTC

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Creator: Richard Guy Briggs

Created: 2013-01-24 14:29:36 UTC

Size: 2.32 KB

patch

obsolete

>#include <stdio.h>
>#include <unistd.h>
>#include <stdlib.h>
>#include <string.h>
>#include <sys/types.h>
>#include <sys/socket.h>
>#include <errno.h>
>#include <linux/netlink.h>
>/* select */
>#include <sys/time.h>
>#include <sys/types.h>
>#include <unistd.h>
>#define HAVE_LIBCAP_NG
>#ifdef HAVE_LIBCAP_NG
>#include <cap-ng.h>
>#endif
>#ifndef CAP_AUDIT_READ
>#define CAP_AUDIT_READ	37
>#endif
>
>int main(int argc, char *argv[])
>{
>	int socket_fd;
>	const struct sockaddr_nl sanl = {
>		.nl_family	= AF_NETLINK,
>        	.nl_pid		= 0,
>		.nl_groups	= 1,
>	};
>	int ret;
>
>	char nlh[4096];
>	struct iovec iov = { nlh, sizeof(nlh) };
>	struct msghdr msg = {
>		.msg_name	= (void *)&sanl,
>		.msg_namelen	= sizeof(sanl),
>		.msg_iov	= &iov,
>		.msg_iovlen	= 1,
>		.msg_control	= NULL,
>		.msg_controllen	= 0,
>		.msg_flags	= 0,
>	};
>	fd_set rfds;
>
>	argc = argc; /* shut up compiler */
>
>#ifdef HAVE_LIBCAP_NG
>	/* Drop capabilities */
>	capng_clear(CAPNG_SELECT_BOTH);
>	capng_update(CAPNG_ADD,
>			CAPNG_EFFECTIVE|CAPNG_PERMITTED|CAPNG_BOUNDING_SET,
>			CAP_AUDIT_READ);
>	capng_apply(CAPNG_SELECT_BOTH);
>#endif
>	
>	socket_fd = socket(PF_NETLINK,
>			       SOCK_RAW|SOCK_CLOEXEC|SOCK_NONBLOCK,
>			       NETLINK_AUDIT);
>	if (socket_fd == -1) {
>		perror("socket()");
>		exit(EXIT_FAILURE);
>	}
>
>	ret = bind(socket_fd, (const struct sockaddr *)(&sanl), sizeof(sanl));
>	if (ret == -1) {
>		perror("bind()");
>		exit(EXIT_FAILURE);
>	} else {
>		printf("%s: bound to group %d\n", argv[0], sanl.nl_groups);
>	}
>
>	FD_ZERO(&rfds);
>	FD_SET(socket_fd, &rfds);
>
>	while (1) {
>		ret = select(socket_fd+1, &rfds, NULL, NULL, NULL);
>		if (ret == -1) {
>			perror("select()");
>			exit(EXIT_FAILURE);
>		} else if (ret == 0) {
>			printf("%s: Unexpected select() timeout.\n", argv[0]);
>			break;
>		}
>
>		memset(nlh, 0, sizeof(nlh));
>		ret = recvmsg(socket_fd, &msg, MSG_DONTWAIT);
>		if (ret > 0) {
>			printf("%s: received(%d): %*s\n", argv[0],
>			       ((struct nlmsghdr*)nlh)->nlmsg_len - NLMSG_HDRLEN,
>			       ((struct nlmsghdr*)nlh)->nlmsg_len - NLMSG_HDRLEN,
>			       (char*)(NLMSG_DATA((struct nlmsghdr*)(nlh))));
>		} else if (ret == 0) {
>			printf("%s: kaudit shut down.  Exiting.\n", argv[0]);
>			exit(EXIT_SUCCESS);
>		} else {
>			switch (errno) {
>			case EAGAIN:
>			case EINTR:
>				printf("%s: interrupt received\n", argv[0]);
>				break;
>			default:
>				perror("recvmsg()");
>				exit(EXIT_FAILURE);
>			}
>		}
>	}
>	exit(EXIT_SUCCESS);
>}

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Attachments on bug 887992: 686259 | 686801 | 686820