[Iftop-users] Porting iftop 1.0 to FreeBSD
Frédéric Perrin
frederic.perrin at resel.fr
Mon, 06 Dec 2010 10:16:50 +0100
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Hello,
Today I compiled iftop-1.0pre1 if a FreeBSD system. I had to make the
following changes:
=2D config/int_ghba_r.c uses AF_INET, which is defined in <sys/socket.h>,
without #include'ing it ;
=2D add =C2=AB #define define s6_addr32 __u6_addr.__u6_addr32 =C2=BB in con=
fig.h
(this is used in addr_hash and ns_hash.c). FreeBSD has a note in
<netinet6/in6.h> saying it is not standard ;
=2D in resolver.c, only the getnameinfo() method tries to resolve ip6
addresses. I ported the AF guessing to the gethostbyaddr{,_r} methods,
as I am not familiar with the libresolv or the ares librairies. This
enables reverse ip6 resolution.
The patch is attached. Could you please review it, and apply it if it
DTRT ?
=2D-=20
Fred
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Content-Type: text/x-patch
Content-Disposition: inline; filename=iftop.fBSD.patch
Content-Description: FreeBSD port effort
diff -ur iftop-1.0pre1.orig/config/int_ghba_r.c iftop-1.0pre1/config/int_ghba_r.c
--- iftop-1.0pre1.orig/config/int_ghba_r.c 2002-11-04 13:27:35.000000000 +0100
+++ iftop-1.0pre1/config/int_ghba_r.c 2010-12-04 12:43:29.000000000 +0100
@@ -6,6 +6,7 @@
static const char rcsid[] = "$Id: int_ghba_r.c,v 1.1 2002/11/04 12:27:35 chris Exp $";
+#include <sys/socket.h>
#include <sys/types.h>
#include <errno.h>
diff -ur iftop-1.0pre1.orig/config.h.in iftop-1.0pre1/config.h.in
--- iftop-1.0pre1.orig/config.h.in 2010-11-27 12:41:51.000000000 +0100
+++ iftop-1.0pre1/config.h.in 2010-12-03 17:11:59.000000000 +0100
@@ -158,3 +158,9 @@
/* Define to `unsigned int' if <sys/types.h> does not define. */
#undef size_t
+
+/* fBSD doesn't define this in user-land code, with a note saying this
+/* is not standard */
+#ifndef s6_addr32
+# define s6_addr32 __u6_addr.__u6_addr32
+#endif
diff -ur iftop-1.0pre1.orig/resolver.c iftop-1.0pre1/resolver.c
--- iftop-1.0pre1.orig/resolver.c 2010-11-27 11:56:44.000000000 +0100
+++ iftop-1.0pre1/resolver.c 2010-12-05 14:48:00.000000000 +0100
@@ -37,6 +37,22 @@
extern options_t options;
+int guess_af(struct in6_addr *addr)
+{
+ /* If the upper three (network byte order) uint32-parts
+ * are null, then there ought to be an IPv4 address here.
+ * Any such IPv6 would have to be 'xxxx::'. Neglectable? */
+ uint32_t* probe;
+ int af;
+
+ probe = (uint32_t *) addr;
+ return (probe[1] || probe[2] || probe[3]) ? AF_INET6 : AF_INET;
+}
+
+socklen_t aflength(int af)
+{
+ return af == AF_INET6 ? sizeof(struct in6_addr) : sizeof(struct in_addr);
+}
/*
* We have a choice of resolver methods. Real computers have getnameinfo or
@@ -60,18 +76,11 @@
struct sockaddr_in6 sin6;
char buf[NI_MAXHOST]; /* 1025 */
int res, af;
- uint32_t* probe;
memset(&sin, '\0', sizeof(sin));
memset(&sin6, '\0', sizeof(sin6));
- /* If the upper three (network byte order) uint32-parts
- * are null, then there ought to be an IPv4 address here.
- * Any such IPv6 would have to be 'xxxx::'. Neglectable? */
- probe = (uint32_t *) addr;
- af = (probe[1] || probe[2] || probe[3]) ? AF_INET6 : AF_INET;
-
- switch (af) {
+ switch (guess_af(addr)) {
case AF_INET:
sin.sin_family = af;
sin.sin_port = 0;
@@ -106,26 +115,29 @@
* Some implementations of libc choose to implement gethostbyaddr_r as
* a non thread-safe wrapper to gethostbyaddr. An interesting choice...
*/
-char* do_resolve(struct in_addr * addr) {
+char* do_resolve(struct in6_addr * addr) {
struct hostent hostbuf, *hp;
size_t hstbuflen = 1024;
char *tmphstbuf;
int res;
int herr;
+ int af;
char * ret = NULL;
/* Allocate buffer, remember to free it to avoid memory leakage. */
tmphstbuf = xmalloc (hstbuflen);
+ af = guess_af(addr);
+
/* Some machines have gethostbyaddr_r returning an integer error code; on
* others, it returns a struct hostent*. */
#ifdef GETHOSTBYADDR_R_RETURNS_INT
- while ((res = gethostbyaddr_r((char*)addr, sizeof(struct in_addr), AF_INET,
+ while ((res = gethostbyaddr_r((char*)addr, aflength(af), af,
&hostbuf, tmphstbuf, hstbuflen,
&hp, &herr)) == ERANGE)
#else
/* ... also assume one fewer argument.... */
- while ((hp = gethostbyaddr_r((char*)addr, sizeof(struct in_addr), AF_INET,
+ while ((hp = gethostbyaddr_r((char*)addr, aflength(af), af,
&hostbuf, tmphstbuf, hstbuflen, &herr)) == NULL
&& errno == ERANGE)
#endif
@@ -152,22 +164,24 @@
#elif defined(USE_GETHOSTBYADDR)
/**
- * Implementation using gethostbyname. Since this is nonreentrant, we have to
+ * Implementation using gethostbyaddr. Since this is nonreentrant, we have to
* wrap it in a mutex, losing all benefit of multithreaded resolution.
*/
char *do_resolve(struct in_addr *addr) {
static pthread_mutex_t ghba_mtx = PTHREAD_MUTEX_INITIALIZER;
char *s = NULL;
struct hostent *he;
+ int af;
+ af = guess_af(*addr);
+
pthread_mutex_lock(&ghba_mtx);
- he = gethostbyaddr((char*)addr, sizeof *addr, AF_INET);
+ he = gethostbyaddr((char*)addr, aflength(af), af);
if (he)
s = xstrdup(he->h_name);
pthread_mutex_unlock(&ghba_mtx);
return s;
}
-
#elif defined(USE_LIBRESOLV)
#include <arpa/nameser.h>
@@ -299,7 +313,7 @@
#elif defined(USE_FORKING_RESOLVER)
/**
- * Resolver which forks a process, then uses gethostbyname.
+ * Resolver which forks a process, then uses gethostbyaddr.
*/
#include <signal.h>
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