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Snarf some logic from python, adapted to our own needs, to handle gethostbyname_r correctly across platforms.

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svn:r3649
This commit is contained in:
Nick Mathewson 2005-02-22 04:50:31 +00:00
parent a68fcbf807
commit d060f845f2
2 changed files with 79 additions and 5 deletions
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57
configure.in
View file

@ -151,7 +151,7 @@ dnl These headers are not essential
AC_CHECK_HEADERS(stdint.h sys/types.h inttypes.h sys/param.h sys/wait.h sys/limits.h netinet/in.h arpa/inet.h machine/limits.h syslog.h sys/time.h sys/resource.h pthread.h stddef.h inttypes.h)
AC_CHECK_FUNCS(gettimeofday ftime socketpair uname inet_aton strptime getrlimit setrlimit strlcat strlcpy strtoull getpwnam ftello pthread_create gethostbyname_r getaddrinfo)
AC_CHECK_FUNCS(gettimeofday ftime socketpair uname inet_aton strptime getrlimit setrlimit strlcat strlcpy strtoull getpwnam ftello pthread_create getaddrinfo)
AC_FUNC_FSEEKO
AC_CHECK_MEMBERS([struct timeval.tv_sec])
@ -246,6 +246,61 @@ if [[ $dmalloc -eq 1 ]]; then
AC_DEFINE(DMALLOC_FUNC_CHECK, 1, [Enable dmalloc's malloc function check])
fi
# Check for gethostbyname_r in all its glorious incompatible versions.
# (This logic is based on that in Python's configure.in)
AH_TEMPLATE(HAVE_GETHOSTBYNAME_R,
[Define this if you have any gethostbyname_r()])
AC_CHECK_FUNC(gethostbyname_r, [
AC_MSG_CHECKING([how many arguments gethostbyname_r() wants])
OLD_CFLAGS=$CFLAGS
CFLAGS="$CFLAGS $MY_CPPFLAGS $MY_THREAD_CPPFLAGS $MY_CFLAGS"
AC_TRY_COMPILE([
#include <netdb.h>
], [
char *cp1, *cp2;
struct hostent *h1, *h2;
int i1, i2;
(void)gethostbyname_r(cp1,h1,cp2,i1,&h2,&i2);
], [
AC_DEFINE(HAVE_GETHOSTBYNAME_R)
AC_DEFINE(HAVE_GETHOSTBYNAME_R_6_ARG, 1,
[Define this if gethostbyname_r takes 6 arguments])
AC_MSG_RESULT(6)
], [
AC_TRY_COMPILE([
#include <netdb.h>
], [
char *cp1, *cp2;
struct hostent *h1;
int i1, i2;
(void)gethostbyname_r(cp1,h1,cp2,i1,&i2);
], [
AC_DEFINE(HAVE_GETHOSTBYNAME_R)
AC_DEFINE(HAVE_GETHOSTBYNAME_R_5_ARG, 1,
[Define this if gethostbyname_r takes 5 arguments])
AC_MSG_RESULT(5)
], [
AC_TRY_COMPILE([
#include <netdb.h>
], [
char *cp1;
struct hostent *h1;
struct hostent_data hd;
(void) gethostbyname_r(cp1,h1,&hd);
], [
AC_DEFINE(HAVE_GETHOSTBYNAME_R)
AC_DEFINE(HAVE_GETHOSTBYNAME_R_3_ARG, 1,
[Define this if gethostbyname_r takes 3 arguments])
AC_MSG_RESULT(3)
], [
AC_MSG_RESULT(0)
])
])
])
CFLAGS=$OLD_CFLAGS
])
# $prefix stores the value of the --prefix command line option, or
# NONE if the option wasn't set. In the case that it wasn't set, make
# it be the default, so that we can use it to expand directories now.

27
src/common/compat.c
View file

@ -530,10 +530,29 @@ int tor_lookup_hostname(const char *name, uint32_t *addr)
return (err == EAI_AGAIN) ? 1 : -1;
#else
struct hostent *ent;
#ifdef HAVE_GETHOSTBYNAME_R
ent = gethostbyname_r(name);
int err;
#ifdef HAVE_GETHOSTBYNAME_R_6_ARG
char buf[2048];
struct hostent hostent;
int r;
r = gethostbyname_r(name, &hostent, buf, sizeof(buf), &ent, &err);
#elif defined(HAVE_GETHOSTBYNAME_R_5_ARG);
char buf[2048];
struct hostent hostent;
ent = gethostbyname_r(name, &hostent, buf, sizeof(buf), &err);
#elif defined(HAVE_GETHOSTBYNAME_R_3_ARG);
struct hostent_data data;
struct hostent hent;
memset(&data, 0, sizeof(data));
err = gethostbyname_r(name, &hent, &data);
ent = err ? NULL : &hent;
#else
ent = gethostbyname(name);
#ifdef MS_WINDOWS
err = WSAGetLastError();
#else
err = h_errno;
#endif
#endif
if (ent) {
/* break to remind us if we move away from IPv4 */
@ -543,9 +562,9 @@ int tor_lookup_hostname(const char *name, uint32_t *addr)
}
memset(addr, 0, 4);
#ifdef MS_WINDOWS
return (WSAGetLastError() == WSATRY_AGAIN) ? 1 : -1;
return (err == WSATRY_AGAIN) ? 1 : -1;
#else
return (h_errno == TRY_AGAIN) ? 1 : -1;
return (err == TRY_AGAIN) ? 1 : -1;
#endif
#endif
}