Added boolean argument to link searching functions, indicating

whether they should create a link if lookup has failed or not.

7 files changed, 42 insertions, 107 deletions

diff --git a/lib/libalias/alias.c b/lib/libalias/alias.c
index a2ef4bf..fd35221 100644
--- a/lib/libalias/alias.c
+++ b/lib/libalias/alias.c
@@ -250,7 +250,7 @@ IcmpAliasIn1(struct ip *pip)
     ic = (struct icmp *) ((char *) pip + (pip->ip_hl << 2));
 
 /* Get source address from ICMP data field and restore original data */
-    link = FindIcmpIn(pip->ip_src, pip->ip_dst, ic->icmp_id);
+    link = FindIcmpIn(pip->ip_src, pip->ip_dst, ic->icmp_id, 1);
     if (link != NULL)
     {
         u_short original_id;
@@ -306,14 +306,14 @@ IcmpAliasIn2(struct ip *pip)
     if (ip->ip_p == IPPROTO_UDP)
         link = FindUdpTcpIn(ip->ip_dst, ip->ip_src,
                             ud->uh_dport, ud->uh_sport,
-                            IPPROTO_UDP);
+                            IPPROTO_UDP, 0);
     else if (ip->ip_p == IPPROTO_TCP)
         link = FindUdpTcpIn(ip->ip_dst, ip->ip_src,
                             tc->th_dport, tc->th_sport,
-                            IPPROTO_TCP);
+                            IPPROTO_TCP, 0);
     else if (ip->ip_p == IPPROTO_ICMP) {
         if (ic2->icmp_type == ICMP_ECHO || ic2->icmp_type == ICMP_TSTAMP)
-            link = FindIcmpIn(ip->ip_dst, ip->ip_src, ic2->icmp_id);
+            link = FindIcmpIn(ip->ip_dst, ip->ip_src, ic2->icmp_id, 0);
         else
             link = NULL;
     } else
@@ -443,7 +443,7 @@ IcmpAliasOut1(struct ip *pip)
     ic = (struct icmp *) ((char *) pip + (pip->ip_hl << 2));
 
 /* Save overwritten data for when echo packet returns */
-    link = FindIcmpOut(pip->ip_src, pip->ip_dst, ic->icmp_id);
+    link = FindIcmpOut(pip->ip_src, pip->ip_dst, ic->icmp_id, 1);
     if (link != NULL)
     {
         u_short alias_id;
@@ -500,14 +500,14 @@ IcmpAliasOut2(struct ip *pip)
     if (ip->ip_p == IPPROTO_UDP)
         link = FindUdpTcpOut(ip->ip_dst, ip->ip_src,
                             ud->uh_dport, ud->uh_sport,
-                            IPPROTO_UDP);
+                            IPPROTO_UDP, 0);
     else if (ip->ip_p == IPPROTO_TCP)
         link = FindUdpTcpOut(ip->ip_dst, ip->ip_src,
                             tc->th_dport, tc->th_sport,
-                            IPPROTO_TCP);
+                            IPPROTO_TCP, 0);
     else if (ip->ip_p == IPPROTO_ICMP) {
         if (ic2->icmp_type == ICMP_ECHO || ic2->icmp_type == ICMP_TSTAMP)
-            link = FindIcmpOut(ip->ip_dst, ip->ip_src, ic2->icmp_id);
+            link = FindIcmpOut(ip->ip_dst, ip->ip_src, ic2->icmp_id, 0);
         else
             link = NULL;
     } else
@@ -717,7 +717,7 @@ UdpAliasIn(struct ip *pip)
 
     link = FindUdpTcpIn(pip->ip_src, pip->ip_dst,
                         ud->uh_sport, ud->uh_dport,
-                        IPPROTO_UDP);
+                        IPPROTO_UDP, 1);
     if (link != NULL)
     {
         struct in_addr alias_address;
@@ -791,7 +791,7 @@ UdpAliasOut(struct ip *pip)
 
     link = FindUdpTcpOut(pip->ip_src, pip->ip_dst,
                          ud->uh_sport, ud->uh_dport,
-                         IPPROTO_UDP);
+                         IPPROTO_UDP, 1);
     if (link != NULL)
     {
         u_short alias_port;
@@ -857,7 +857,8 @@ TcpAliasIn(struct ip *pip)
 
     link = FindUdpTcpIn(pip->ip_src, pip->ip_dst,
                         tc->th_sport, tc->th_dport,
-                        IPPROTO_TCP);
+                        IPPROTO_TCP,
+                        !(packetAliasMode & PKT_ALIAS_PROXY_ONLY));
     if (link != NULL)
     {
         struct in_addr alias_address;
@@ -1012,7 +1013,7 @@ TcpAliasOut(struct ip *pip, int maxpacketsize)
 
     link = FindUdpTcpOut(pip->ip_src, pip->ip_dst,
                          tc->th_sport, tc->th_dport,
-                         IPPROTO_TCP);
+                         IPPROTO_TCP, 1);
     if (link !=NULL)
     {
         u_short alias_port;
@@ -1438,15 +1439,15 @@ PacketUnaliasOut(char *ptr,           /* valid IP packet */
 
     /* Find a link */
     if (pip->ip_p == IPPROTO_UDP)
-        link = QueryUdpTcpIn(pip->ip_dst, pip->ip_src,
+        link = FindUdpTcpIn(pip->ip_dst, pip->ip_src,
                             ud->uh_dport, ud->uh_sport,
-                            IPPROTO_UDP);
+                            IPPROTO_UDP, 0);
     else if (pip->ip_p == IPPROTO_TCP)
-        link = QueryUdpTcpIn(pip->ip_dst, pip->ip_src,
+        link = FindUdpTcpIn(pip->ip_dst, pip->ip_src,
                             tc->th_dport, tc->th_sport,
-                            IPPROTO_TCP);
+                            IPPROTO_TCP, 0);
     else if (pip->ip_p == IPPROTO_ICMP) 
-        link = FindIcmpIn(pip->ip_dst, pip->ip_src, ic->icmp_id);
+        link = FindIcmpIn(pip->ip_dst, pip->ip_src, ic->icmp_id, 0);
     else
         link = NULL;
 
diff --git a/lib/libalias/alias_cuseeme.c b/lib/libalias/alias_cuseeme.c
index 7ac1f83..1a7fbf1 100644
--- a/lib/libalias/alias_cuseeme.c
+++ b/lib/libalias/alias_cuseeme.c
@@ -79,7 +79,7 @@ AliasHandleCUSeeMeOut(struct ip *pip, struct alias_link *link)
       cu->addr = (u_int32_t)GetAliasAddress(link).s_addr;
 
     cu_link = FindUdpTcpOut(pip->ip_src, GetDestAddress(link),
-                            ud->uh_dport, 0, IPPROTO_UDP);
+                            ud->uh_dport, 0, IPPROTO_UDP, 1);
                          
 #ifndef NO_FW_PUNCH
     if (cu_link)
diff --git a/lib/libalias/alias_db.c b/lib/libalias/alias_db.c
index 7b04548..f926239 100644
--- a/lib/libalias/alias_db.c
+++ b/lib/libalias/alias_db.c
@@ -1402,14 +1402,15 @@ FindLinkIn(struct in_addr dst_addr,
 struct alias_link *
 FindIcmpIn(struct in_addr dst_addr,
            struct in_addr alias_addr,
-           u_short id_alias)
+           u_short id_alias,
+           int create)
 {
     struct alias_link *link;
 
     link = FindLinkIn(dst_addr, alias_addr,
                       NO_DEST_PORT, id_alias,
                       LINK_ICMP, 0);
-    if (link == NULL && !(packetAliasMode & PKT_ALIAS_DENY_INCOMING))
+    if (link == NULL && create && !(packetAliasMode & PKT_ALIAS_DENY_INCOMING))
     {
         struct in_addr target_addr;
 
@@ -1426,14 +1427,15 @@ FindIcmpIn(struct in_addr dst_addr,
 struct alias_link *
 FindIcmpOut(struct in_addr src_addr,
             struct in_addr dst_addr,
-            u_short id)
+            u_short id,
+            int create)
 {
     struct alias_link * link;
 
     link = FindLinkOut(src_addr, dst_addr,
                        id, NO_DEST_PORT,
                        LINK_ICMP, 0);
-    if (link == NULL)
+    if (link == NULL && create)
     {
         struct in_addr alias_addr;
 
@@ -1555,7 +1557,8 @@ FindUdpTcpIn(struct in_addr dst_addr,
              struct in_addr alias_addr,
              u_short        dst_port,
              u_short        alias_port,
-             u_char         proto)
+             u_char         proto,
+             int            create)
 {
     int link_type;
     struct alias_link *link;
@@ -1575,11 +1578,9 @@ FindUdpTcpIn(struct in_addr dst_addr,
 
     link = FindLinkIn(dst_addr, alias_addr,
                       dst_port, alias_port,
-                      link_type, 1);
+                      link_type, create);
 
-    if (!(packetAliasMode & PKT_ALIAS_DENY_INCOMING)
-     && !(packetAliasMode & PKT_ALIAS_PROXY_ONLY)
-     && link == NULL)
+    if (link == NULL && create && !(packetAliasMode & PKT_ALIAS_DENY_INCOMING))
     {
         struct in_addr target_addr;
 
@@ -1598,7 +1599,8 @@ FindUdpTcpOut(struct in_addr  src_addr,
               struct in_addr  dst_addr,
               u_short         src_port,
               u_short         dst_port,
-              u_char          proto)
+              u_char          proto,
+              int             create)
 {
     int link_type;
     struct alias_link *link;
@@ -1616,9 +1618,9 @@ FindUdpTcpOut(struct in_addr  src_addr,
         break;
     }
 
-    link = FindLinkOut(src_addr, dst_addr, src_port, dst_port, link_type, 1);
+    link = FindLinkOut(src_addr, dst_addr, src_port, dst_port, link_type, create);
 
-    if (link == NULL)
+    if (link == NULL && create)
     {
         struct in_addr alias_addr;
 
@@ -1633,67 +1635,6 @@ FindUdpTcpOut(struct in_addr  src_addr,
 
 
 struct alias_link *
-QueryUdpTcpIn(struct in_addr dst_addr,
-              struct in_addr alias_addr,
-              u_short        dst_port,
-              u_short        alias_port,
-              u_char         proto)
-{
-    int link_type;
-    struct alias_link *link;
-
-    switch (proto)
-    {
-    case IPPROTO_UDP:
-        link_type = LINK_UDP;
-        break;
-    case IPPROTO_TCP:
-        link_type = LINK_TCP;
-        break;
-    default:
-        return NULL;
-        break;
-    }
-
-    link = FindLinkIn(dst_addr, alias_addr,
-                      dst_port, alias_port,
-                      link_type, 0);
-
-    return(link);
-}
-
-
-struct alias_link * 
-QueryUdpTcpOut(struct in_addr  src_addr,
-               struct in_addr  dst_addr,
-               u_short         src_port,
-               u_short         dst_port,
-               u_char          proto)
-{
-    int link_type;
-    struct alias_link *link;
-
-    switch (proto)
-    {
-    case IPPROTO_UDP:
-        link_type = LINK_UDP;
-        break;
-    case IPPROTO_TCP:
-        link_type = LINK_TCP;
-        break;
-    default:
-        return NULL;
-        break;
-    }
-
-    link = FindLinkOut(src_addr, dst_addr,
-                       src_port, dst_port,
-		       link_type, 0);
-
-    return(link);
-}
-
-struct alias_link *
 AddPptp(struct in_addr  src_addr,
 	struct in_addr  dst_addr,
 	struct in_addr  alias_addr,
diff --git a/lib/libalias/alias_ftp.c b/lib/libalias/alias_ftp.c
index c4c323f..d5978f9 100644
--- a/lib/libalias/alias_ftp.c
+++ b/lib/libalias/alias_ftp.c
@@ -443,7 +443,7 @@ NewFtpMessage(struct ip *pip,
 
 /* Establish link to address and port found in FTP control message. */
     ftp_link = FindUdpTcpOut(true_addr, GetDestAddress(link),
-                             htons(true_port), 0, IPPROTO_TCP);
+                             htons(true_port), 0, IPPROTO_TCP, 1);
 
     if (ftp_link != NULL)
     {
diff --git a/lib/libalias/alias_irc.c b/lib/libalias/alias_irc.c
index 8c52c1f..afd032d 100644
--- a/lib/libalias/alias_irc.c
+++ b/lib/libalias/alias_irc.c
@@ -216,10 +216,9 @@ lFOUND_CTCP:
 			 /* Steal the FTP_DATA_PORT - it doesn't really matter, and this
 				 would probably allow it through at least _some_
 				 firewalls. */
-			 dcc_link = FindUdpTcpOut (true_addr,
-											destaddr,
-										   true_port,
-											0, IPPROTO_TCP);
+			 dcc_link = FindUdpTcpOut(true_addr, destaddr,
+						  true_port, 0,
+						  IPPROTO_TCP, 1);
 			 DBprintf(("Got a DCC link\n"));
 			 if ( dcc_link ) {
 				 struct in_addr alias_address;	/* Address from aliasing */
diff --git a/lib/libalias/alias_local.h b/lib/libalias/alias_local.h
index bd2aa75..c4292e4 100644
--- a/lib/libalias/alias_local.h
+++ b/lib/libalias/alias_local.h
@@ -78,10 +78,10 @@ void DifferentialChecksum(u_short *, u_short *, u_short *, int);
 
 /* Internal data access */
 struct alias_link *
-FindIcmpIn(struct in_addr, struct in_addr, u_short);
+FindIcmpIn(struct in_addr, struct in_addr, u_short, int);
 
 struct alias_link *
-FindIcmpOut(struct in_addr, struct in_addr, u_short);
+FindIcmpOut(struct in_addr, struct in_addr, u_short, int);
 
 struct alias_link *
 FindFragmentIn1(struct in_addr, struct in_addr, u_short);
@@ -102,10 +102,10 @@ struct alias_link *
 FindProtoOut(struct in_addr, struct in_addr, u_char);
 
 struct alias_link *
-FindUdpTcpIn (struct in_addr, struct in_addr, u_short, u_short, u_char);
+FindUdpTcpIn (struct in_addr, struct in_addr, u_short, u_short, u_char, int);
 
 struct alias_link *
-FindUdpTcpOut(struct in_addr, struct in_addr, u_short, u_short, u_char);
+FindUdpTcpOut(struct in_addr, struct in_addr, u_short, u_short, u_char, int);
 
 struct alias_link *
 AddPptp(struct in_addr, struct in_addr, struct in_addr, u_int16_t);
@@ -123,12 +123,6 @@ struct alias_link *
 FindPptpInByPeerCallId(struct in_addr, struct in_addr, u_int16_t);
 
 struct alias_link *
-QueryUdpTcpIn (struct in_addr, struct in_addr, u_short, u_short, u_char);
-
-struct alias_link *
-QueryUdpTcpOut(struct in_addr, struct in_addr, u_short, u_short, u_char);
-
-struct alias_link *
 FindRtspOut(struct in_addr, struct in_addr, u_short, u_short, u_char);
 
 struct in_addr
diff --git a/lib/libalias/alias_smedia.c b/lib/libalias/alias_smedia.c
index 9df0578..1cde3e6 100644
--- a/lib/libalias/alias_smedia.c
+++ b/lib/libalias/alias_smedia.c
@@ -343,7 +343,7 @@ alias_pna_out(struct ip *pip,
 	if ((ntohs(msg_id) == 1) || (ntohs(msg_id) == 7)) {
 	    memcpy((char*)&port, (char*)work, 2);
 	    pna_links = FindUdpTcpOut(pip->ip_src, GetDestAddress(link),
-				      port, 0, IPPROTO_UDP);
+				      port, 0, IPPROTO_UDP, 1);
 	    if (pna_links != NULL) {
 #ifndef NO_FW_PUNCH
 		/* Punch hole in firewall */