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Fix (ignore) Dont-Fragment for OpenBSD and OS X

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This commit is contained in:
Erik Ekman 2009-03-07 00:21:06 +00:00
parent d8cb5bdcd7
commit 5fbb08b8cc
2 changed files with 6 additions and 4 deletions
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2
src/common.c
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@ -130,9 +130,11 @@ open_dns(int localport, in_addr_t listen_ip)
setsockopt(fd, IPPROTO_IP, DSTADDR_SOCKOPT, (const void*) &flag, sizeof(flag));
#endif
#ifdef IP_OPT_DONT_FRAG
/* Set dont-fragment ip header flag */
flag = DONT_FRAG_VALUE;
setsockopt(fd, IPPROTO_IP, IP_OPT_DONT_FRAG, (const void*) &flag, sizeof(flag));
#endif
if(bind(fd, (struct sockaddr*)&addr, sizeof(addr)) < 0)
err(1, "bind");

8
src/common.h
View file

@ -44,16 +44,16 @@
# define dstaddr(x) (&(((struct in_pktinfo *)(CMSG_DATA(x)))->ipi_addr))
#endif
#if defined IP_MTUDISC
# define IP_OPT_DONT_FRAG IP_MTUDISC
# define DONT_FRAG_VALUE 1
#elif defined IP_MTU_DISCOVER
#if defined IP_MTU_DISCOVER
/* Linux */
# define IP_OPT_DONT_FRAG IP_MTU_DISCOVER
# define DONT_FRAG_VALUE IP_PMTUDISC_DO
#elif defined IP_DONTFRAG
/* FreeBSD */
# define IP_OPT_DONT_FRAG IP_DONTFRAG
# define DONT_FRAG_VALUE 1
#elif defined IP_DONTFRAGMENT
/* Winsock2 */
# define IP_OPT_DONT_FRAG IP_DONTFRAGMENT
# define DONT_FRAG_VALUE 1
#endif