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[HQ-93] un-clobber stack data in sigar_gethostbyname

This commit is contained in:
Doug MacEachern 2006-03-02 22:53:09 +00:00
parent f1a13a3361
commit 5c26b463d9
4 changed files with 42 additions and 28 deletions
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19
include/sigar_private.h
View File

@ -239,4 +239,23 @@ int sigar_get_iftype(const char *name, int *type, int *inst);
#define SIGAR_NIC_ETHERNET "Ethernet"
#define SIGAR_NIC_NETROM "AMPR NET/ROM"
#ifdef WIN32
#else
#include <netdb.h>
#endif
#define SIGAR_GETHOSTBYNAME_LEN 512
#if defined(__hpux) || defined(_AIX)
#define SIGAR_HAS_HOSTENT_DATA
#endif
typedef struct {
char buffer[SIGAR_GETHOSTBYNAME_LEN];
struct hostent hs;
int error;
#ifdef SIGAR_HAS_HOSTENT_DATA
struct hostent_data hd;
#endif
} sigar_hostent_t;
#endif

3
include/sigar_util.h
View File

@ -30,7 +30,8 @@
char *sigar_uitoa(char *buf, unsigned int n, int *len);
struct hostent *sigar_gethostbyname(const char *name);
struct hostent *sigar_gethostbyname(const char *name,
sigar_hostent_t *data);
SIGAR_INLINE char *sigar_skip_line(char *buffer, int buflen);

45
src/sigar.c
View File

@ -1547,34 +1547,26 @@ static int fqdn_ip_get(sigar_t *sigar, char *name)
return SIGAR_OK;
}
#ifdef WIN32
#else
#include <netdb.h>
#endif
#define GETHOSTBYNAME_LEN 512
#if defined(__hpux) || defined(_AIX)
#define HAS_HOSTENT_DATA
#endif
struct hostent *sigar_gethostbyname(const char *name)
struct hostent *sigar_gethostbyname(const char *name,
sigar_hostent_t *data)
{
char buffer[GETHOSTBYNAME_LEN];
struct hostent hs, *hp;
int err;
#if defined(HAS_HOSTENT_DATA)
struct hostent_data hd;
#endif
struct hostent *hp = NULL;
#if defined(__linux__)
gethostbyname_r(name, &hs, buffer, sizeof(buffer),
&hp, &err);
gethostbyname_r(name, &data->hs,
data->buffer, sizeof(data->buffer),
&hp, &data->error);
#elif defined(__sun)
hp = gethostbyname_r(name, &hs, buffer, sizeof(buffer),
&err);
#elif defined(HAS_HOSTENT_DATA)
gethostbyname_r(name, &hs, &hd);
hp = &hs;
hp = gethostbyname_r(name, &data->hs,
data->buffer, sizeof(data->buffer),
&data->error);
#elif defined(SIGAR_HAS_HOSTENT_DATA)
if (gethostbyname_r(name, &data->hs, &data->hd) == 0) {
hp = &data->hs;
}
else {
data->error = h_errno;
}
#else
hp = gethostbyname(name);
#endif
@ -1593,6 +1585,7 @@ struct hostent *sigar_gethostbyname(const char *name)
SIGAR_DECLARE(int) sigar_fqdn_get(sigar_t *sigar, char *name, int namelen)
{
sigar_hostent_t data;
struct hostent *p;
char domain[SIGAR_FQDN_LEN + 1];
#ifdef WIN32
@ -1618,7 +1611,7 @@ SIGAR_DECLARE(int) sigar_fqdn_get(sigar_t *sigar, char *name, int namelen)
}
/* XXX use _r versions of these functions. */
if (!(p = sigar_gethostbyname(name))) {
if (!(p = sigar_gethostbyname(name, &data))) {
if (SIGAR_LOG_IS_DEBUG(sigar)) {
sigar_log_printf(sigar, SIGAR_LOG_DEBUG,
"[fqdn] gethostbyname(%s) failed: %s",
@ -1667,7 +1660,7 @@ SIGAR_DECLARE(int) sigar_fqdn_get(sigar_t *sigar, char *name, int namelen)
int i,j;
for (i=0; p->h_addr_list[i]; i++) {
struct hostent *q =
struct hostent *q =
gethostbyaddr(p->h_addr_list[i],
p->h_length,
p->h_addrtype);

3
src/sigar_util.c
View File

@ -496,12 +496,13 @@ int sigar_cpu_mhz_from_model(char *model)
static enum clnt_stat get_sockaddr(struct sockaddr_in *addr, char *host)
{
register struct hostent *hp;
sigar_hostent_t data;
memset(addr, 0, sizeof(struct sockaddr_in));
addr->sin_family = AF_INET;
if ((addr->sin_addr.s_addr = inet_addr(host)) == -1) {
if (!(hp = sigar_gethostbyname(host))) {
if (!(hp = sigar_gethostbyname(host, &data))) {
return RPC_UNKNOWNHOST;
}
memcpy(&addr->sin_addr, hp->h_addr, hp->h_length);