Attachment 153282 Details for Bug 197882 – test program to reproduce

test program to reproduce

main.c (text/plain), 2.53 KB, created by Andrey V. Elsukov on 2015-02-21 17:16:29 UTC

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Creator: Andrey V. Elsukov

Created: 2015-02-21 17:16:29 UTC

Size: 2.53 KB

patch

obsolete

>#include <sys/types.h>
>#include <sys/socket.h>
>#include <sys/select.h>
>#include <netinet/in.h>
>#include <err.h>
>#include <netdb.h>
>#include <stdio.h>
>#include <stdlib.h>
>#include <string.h>
>#include <unistd.h>
>
>#define	SENDSIZE	2000
>#define	SENDPORT	1234
>int
>main(int argc, char **argv)
>{
>	struct addrinfo hints, *res;
>	struct sockaddr_in6 sa6;
>	struct msghdr msg;
>	struct iovec iov;
>	struct timeval tv;
>	struct ip6_mtuinfo *minfo;
>	struct cmsghdr *cmsg;
>	fd_set fd;
>	int s6, ret, v;
>	char *buf, ctrl[CMSG_SPACE(sizeof(struct ip6_mtuinfo))];
>
>	if (argc < 2)
>		errx(1, "Usage: %s <IPv6 destination address>\n", argv[0]);
>
>	memset(&hints, 0, sizeof(hints));
>	hints.ai_family = AF_INET6;
>	hints.ai_flags = AI_NUMERICHOST;
>	ret = getaddrinfo(argv[1], NULL, &hints, &res);
>	if (ret != 0)
>		errx(1, "getaddrinfo(%s): %s", argv[1], gai_strerror(ret));
>	s6 = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
>	if (s6 < 0)
>		err(1, "socket()");
>	v = 1;
>	ret = setsockopt(s6, IPPROTO_IPV6, IPV6_RECVPATHMTU, &v, sizeof(v));
>	if (ret < 0)
>		err(1, "setsockopt(IPV6_RECVPATHMTU)");
>	v = 1;
>	ret = setsockopt(s6, IPPROTO_IPV6, IPV6_DONTFRAG, &v, sizeof(v));
>	if (ret < 0)
>		err(1, "setsockopt(IPV6_DONTFRAG)");
>	buf = calloc(1, SENDSIZE);
>	if (buf == NULL)
>		err(1, "calloc()");
>	sa6 = *(struct sockaddr_in6 *)res->ai_addr;
>	sa6.sin6_port = htons(SENDPORT);
>	ret = sendto(s6, buf, SENDSIZE, 0,
>	    (struct sockaddr *)&sa6, sizeof(sa6));
>	if (ret != SENDSIZE)
>		warn("sendto()");
>
>	FD_ZERO(&fd);
>	FD_SET(s6, &fd);
>	tv.tv_sec = 2;
>	tv.tv_usec = 0;
>	ret = select(s6 + 1, &fd, NULL, NULL, &tv);
>	if (ret <= 0)
>		printf("No ancillary data received\n");
>	else {
>		memset(&msg, 0, sizeof(msg));
>		msg.msg_name = &sa6;
>		msg.msg_namelen = sizeof(sa6);
>		msg.msg_control = ctrl;
>		msg.msg_controllen = sizeof(ctrl);
>		msg.msg_iov = &iov;
>		msg.msg_iovlen = 1;
>		iov.iov_base = buf;
>		iov.iov_len = SENDSIZE;
>		cmsg = (struct cmsghdr *)ctrl;
>		ret = recvmsg(s6, &msg, 0);
>		if (ret < 0)
>			warn("recvmsg()");
>		else if (cmsg->cmsg_level == IPPROTO_IPV6 &&
>		    cmsg->cmsg_type == IPV6_PATHMTU &&
>		    cmsg->cmsg_len == CMSG_LEN(sizeof(struct ip6_mtuinfo))) {
>			minfo = (struct ip6_mtuinfo *)CMSG_DATA(cmsg);
>			ret = getnameinfo((struct sockaddr *)&minfo->ip6m_addr,
>			    sizeof(minfo->ip6m_addr), buf, SENDSIZE, NULL, 0,
>			    NI_NUMERICHOST);
>			if (ret == 0)
>				printf("IPV6_PATHMTU ancillary "
>				    "data received:\nIPv6 address: %s\n"
>				    "MTU: %u\n", buf, minfo->ip6m_mtu);
>			else
>				warnx("getnameinfo(): %s", gai_strerror(ret));
>
>		}
>	}
>	free(buf);
>	freeaddrinfo(res);
>	close(s6);
>	return (0);
>}

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Attachments on bug 197882: 153281 | 153282