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Code Issues Releases Wiki Activity

1 - attempted fix of uninitialized variable

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2 - indented and edited to fit better within 80 columns
3 - fixed possible buffer overflow in the service name lookup function
This commit is contained in:
Daniel Stenberg 2005-09-21 10:45:25 +00:00
parent 0f73af4470
commit b9494cb0d6
1 changed files with 44 additions and 28 deletions
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60
ares/ares_getnameinfo.c
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@ -194,9 +194,11 @@ static void nameinfo_callback(void *arg, int status, struct hostent *host)
if (niquery->flags & ARES_NI_LOOKUPSERVICE)
{
if (niquery->family == AF_INET)
service = lookup_service(niquery->addr.addr4.sin_port, niquery->flags, srvbuf);
service = lookup_service(niquery->addr.addr4.sin_port,
niquery->flags, srvbuf);
else
service = lookup_service(niquery->addr.addr6.sin6_port, niquery->flags, srvbuf);
service = lookup_service(niquery->addr.addr6.sin6_port,
niquery->flags, srvbuf);
}
/* NOFQDN means we have to strip off the domain name portion.
We do this by determining our own domain name, then searching the string
@ -234,9 +236,11 @@ static void nameinfo_callback(void *arg, int status, struct hostent *host)
if (niquery->flags & ARES_NI_LOOKUPSERVICE)
{
if (niquery->family == AF_INET)
service = lookup_service(niquery->addr.addr4.sin_port, niquery->flags, srvbuf);
service = lookup_service(niquery->addr.addr4.sin_port,
niquery->flags, srvbuf);
else
service = lookup_service(niquery->addr.addr6.sin6_port, niquery->flags, srvbuf);
service = lookup_service(niquery->addr.addr6.sin6_port,
niquery->flags, srvbuf);
}
niquery->callback(niquery->arg, ARES_SUCCESS, ipbuf, service);
return;
@ -245,7 +249,8 @@ static void nameinfo_callback(void *arg, int status, struct hostent *host)
free(niquery);
}
static char *lookup_service(unsigned short port, int flags, char *buf)
static char *lookup_service(unsigned short port, int flags,
char *buf) /* 33 bytes buffer */
{
if (port)
{
@ -275,24 +280,33 @@ static char *lookup_service(unsigned short port, int flags, char *buf)
else
proto = "tcp";
#ifdef HAVE_GETSERVBYPORT_R
#if GETSERVBYPORT_R_ARGS == 6
if (getservbyport_r(port, proto, se, buf, len, &ret))
se = NULL;
#elif GETSERVBYPORT_R_ARGS == 5
se = getservbyport_r(port, proto, se, buf, len);
#elif GETSERVBYPORT_R_ARGS == 4
if (getservbyport_r(port, proto, se, &sed) == -1)
se = NULL;
#else
/* Lets just hope the OS uses TLS! */
se = getservbyport(port, proto);
#endif
#if GETSERVBYPORT_R_ARGS == 6
se = &ret;
if (getservbyport_r(port, proto, se, buf, len, &ret))
se = NULL;
#elif GETSERVBYPORT_R_ARGS == 5
se = getservbyport_r(port, proto, se, buf, len);
#elif GETSERVBYPORT_R_ARGS == 4
se = &sed;
if (getservbyport_r(port, proto, se, &sed) == -1)
se = NULL;
#else
/* Lets just hope the OS uses TLS! */
se = getservbyport(port, proto);
#endif
if (se && se->s_name)
strcpy(buf, se->s_name);
#else
/* Lets just hope the OS uses TLS! */
se = getservbyport(port, proto);
#endif
if (se && se->s_name) {
size_t len = strlen(se->s_name);
if(len < 33) {
strcpy(buf, se->s_name);
}
else
/* too big name to fit the buffer */
buf[0]=0;
}
else
sprintf(buf, "%u", ntohs(port));
}
@ -302,14 +316,16 @@ static char *lookup_service(unsigned short port, int flags, char *buf)
}
#ifdef HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID
static char *append_scopeid(struct sockaddr_in6 *addr6, unsigned int flags, char *buf)
static char *append_scopeid(struct sockaddr_in6 *addr6, unsigned int flags,
char *buf)
{
char tmpbuf[IF_NAMESIZE + 1];
tmpbuf[0] = '%';
#ifdef HAVE_IF_INDEXTONAME
if ((flags & ARES_NI_NUMERICSCOPE) || (!IN6_IS_ADDR_LINKLOCAL(&addr6->sin6_addr)
&& !IN6_IS_ADDR_MC_LINKLOCAL(&addr6->sin6_addr)))
if ((flags & ARES_NI_NUMERICSCOPE) ||
(!IN6_IS_ADDR_LINKLOCAL(&addr6->sin6_addr)
&& !IN6_IS_ADDR_MC_LINKLOCAL(&addr6->sin6_addr)))
{
sprintf(&tmpbuf[1], "%u", addr6->sin6_scope_id);
}