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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
pull/1/head
Daniel Stenberg 19 years ago
parent af27d8743d
commit 209e8147a1
1 changed files with 44 additions and 28 deletions
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  1. 72
      ares_getnameinfo.c

72
ares_getnameinfo.c
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@ -123,7 +123,7 @@ void ares_getnameinfo(ares_channel channel, const struct sockaddr *sa, socklen_t
char *service = NULL;
ipbuf[0] = 0;
/* Specifying not to lookup a host, but then saying a host
/* Specifying not to lookup a host, but then saying a host
* is required has to be illegal.
*/
if (flags & ARES_NI_NAMEREQD)
@ -163,18 +163,18 @@ void ares_getnameinfo(ares_channel channel, const struct sockaddr *sa, socklen_t
niquery->callback = callback;
niquery->arg = arg;
niquery->flags = flags;
if (sa->sa_family == AF_INET)
if (sa->sa_family == AF_INET)
{
niquery->family = AF_INET;
memcpy(&niquery->addr.addr4, addr, sizeof(addr));
ares_gethostbyaddr(channel, &addr->sin_addr, sizeof(struct in_addr), AF_INET,
ares_gethostbyaddr(channel, &addr->sin_addr, sizeof(struct in_addr), AF_INET,
nameinfo_callback, niquery);
}
else
{
niquery->family = AF_INET6;
memcpy(&niquery->addr.addr6, addr6, sizeof(addr6));
ares_gethostbyaddr(channel, &addr6->sin6_addr, sizeof(struct in6_addr), AF_INET6,
ares_gethostbyaddr(channel, &addr6->sin6_addr, sizeof(struct in6_addr), AF_INET6,
nameinfo_callback, niquery);
}
}
@ -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
@ -212,7 +214,7 @@ static void nameinfo_callback(void *arg, int status, struct hostent *host)
char *end = ares_striendstr(host->h_name, domain);
if (end)
*end = 0;
}
}
}
niquery->callback(niquery->arg, ARES_SUCCESS, host->h_name, service);
return;
@ -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)
{
@ -265,7 +270,7 @@ static char *lookup_service(unsigned short port, int flags, char *buf)
int len = 4096;
#elif GETSERVBYPORT_R_ARGS == 4
struct servent_data sed;
#endif
#endif
if (flags & ARES_NI_UDP)
proto = "udp";
else if (flags & ARES_NI_SCTP)
@ -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);
}

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