diff -Nur ucspi-tcp-0.88/Makefile ucspi-tcp-0.88-spp/Makefile
--- ucspi-tcp-0.88/Makefile	2000-03-18 16:18:42.000000000 +0100
+++ ucspi-tcp-0.88-spp/Makefile	2006-09-26 12:29:33.000000000 +0200
@@ -463,7 +463,7 @@
 prog: \
 tcpserver tcprules tcprulescheck argv0 recordio tcpclient who@ date@ \
 finger@ http@ tcpcat mconnect mconnect-io addcr delcr fixcrio \
-rblsmtpd rts
+rblsmtpd rblspp rts
 
 prot.o: \
 compile prot.c hasshsgr.h prot.h
@@ -474,6 +474,11 @@
 	./load rblsmtpd commands.o dns.a time.a unix.a byte.a  \
 	`cat socket.lib`
 
+rblspp: \
+load rblspp.o dns.a time.a unix.a byte.a socket.lib
+	./load rblspp dns.a time.a unix.a byte.a  \
+	`cat socket.lib`
+
 rblsmtpd.o: \
 compile rblsmtpd.c byte.h str.h scan.h fmt.h env.h exit.h sig.h \
 buffer.h readwrite.h sgetopt.h subgetopt.h strerr.h stralloc.h \
@@ -481,6 +486,13 @@
 tai.h uint64.h taia.h
 	./compile rblsmtpd.c
 
+rblspp.o: \
+compile rblspp.c byte.h str.h scan.h fmt.h env.h exit.h \
+buffer.h readwrite.h sgetopt.h subgetopt.h strerr.h stralloc.h \
+gen_alloc.h dns.h stralloc.h iopause.h taia.h \
+tai.h uint64.h taia.h
+	./compile rblspp.c
+
 readclose.o: \
 compile readclose.c readwrite.h error.h readclose.h stralloc.h \
 gen_alloc.h
diff -Nur ucspi-tcp-0.88/TARGETS ucspi-tcp-0.88-spp/TARGETS
--- ucspi-tcp-0.88/TARGETS	2000-03-18 16:18:42.000000000 +0100
+++ ucspi-tcp-0.88-spp/TARGETS	2006-09-26 12:17:16.000000000 +0200
@@ -153,8 +153,10 @@
 fixcrio.o
 fixcrio
 rblsmtpd.o
+rblspp.o
 commands.o
 rblsmtpd
+rblspp
 rts
 prog
 install.o
diff -Nur ucspi-tcp-0.88/rblspp.c ucspi-tcp-0.88-spp/rblspp.c
--- ucspi-tcp-0.88/rblspp.c	1970-01-01 01:00:00.000000000 +0100
+++ ucspi-tcp-0.88-spp/rblspp.c	2006-12-08 11:16:46.000000000 +0100
@@ -0,0 +1,209 @@
+#include "byte.h"
+#include "str.h"
+#include "scan.h"
+#include "fmt.h"
+#include "env.h"
+#include "exit.h"
+#include "buffer.h"
+#include "readwrite.h"
+#include "sgetopt.h"
+#include "strerr.h"
+#include "stralloc.h"
+#include "dns.h"
+
+#define FATAL "rblspp: fatal: "
+
+void nomem(void)
+{
+  strerr_die2x(111,FATAL,"out of memory");
+}
+void usage(void)
+{
+  strerr_die1x(100,"rblspp: usage: rblspp [ -b | -B ] [ -c | -C ] [ -r base ] [ -a base ]");
+}
+
+char *ip_env;
+static stralloc ip_reverse;
+
+void ip_init(void)
+{
+  unsigned int i;
+  unsigned int j;
+
+  ip_env = env_get("TCPREMOTEIP");
+  if (!ip_env) ip_env = "";
+
+  if (!stralloc_copys(&ip_reverse,"")) nomem();
+
+  i = str_len(ip_env);
+  while (i) {
+    for (j = i;j > 0;--j) if (ip_env[j - 1] == '.') break;
+    if (!stralloc_catb(&ip_reverse,ip_env + j,i - j)) nomem();
+    if (!stralloc_cats(&ip_reverse,".")) nomem();
+    if (!j) break;
+    i = j - 1;
+  }
+}
+
+int flagrblbounce = 0;
+int flagfailclosed = 0;
+int flagmustnotbounce = 0;
+
+int decision = 0; /* 0 undecided, 1 accept, 2 reject, 3 bounce */
+static stralloc text; /* defined if decision is 2 or 3 */
+
+static stralloc tmp;
+
+void rbl(char *base)
+{
+  int i;
+  char *altreply = 0;
+  if (decision) return;
+  if (!stralloc_copy(&tmp,&ip_reverse)) nomem();
+  i = str_chr(base, ':');
+  if (base[i]) {
+    base[i] = 0;
+    altreply = base+i+1;
+  }
+  if (!stralloc_cats(&tmp,base)) nomem();
+  if (altreply) {
+    if (dns_ip4(&text,&tmp) == -1) {
+      flagmustnotbounce = 1;
+      if (flagfailclosed) {
+        if (!stralloc_copys(&text,"temporary RBL lookup error")) nomem();
+        decision = 2;
+      }
+      return;
+    }
+    if (text.len) {
+      if(!stralloc_copys(&text, "")) nomem();
+      while(*altreply) {
+        char *x;
+        i = str_chr(altreply, '%');
+        if(!stralloc_catb(&text, altreply, i)) nomem();
+        if(altreply[i] &&
+           altreply[i+1]=='I' &&
+           altreply[i+2]=='P' &&
+           altreply[i+3]=='%') {
+          if(!stralloc_catb(&text, ip_env, str_len(ip_env))) nomem();
+          altreply+=i+4;
+        } else if(altreply[i]) {
+          if(!stralloc_cats(&text, "%")) nomem();
+          altreply+=i+1;
+        } else {
+          altreply+=i;
+        }
+      }
+    }
+  } else {
+    if (dns_txt(&text,&tmp) == -1) {
+      flagmustnotbounce = 1;
+      if (flagfailclosed) {
+        if (!stralloc_copys(&text,"temporary RBL lookup error")) nomem();
+        decision = 2;
+      }
+      return;
+    }
+  }
+  if (text.len)
+    if (flagrblbounce)
+      decision = 3;
+    else
+      decision = 2;
+}
+
+void antirbl(char *base)
+{
+  if (decision) return;
+  if (!stralloc_copy(&tmp,&ip_reverse)) nomem();
+  if (!stralloc_cats(&tmp,base)) nomem();
+  if (dns_ip4(&text,&tmp) == -1) {
+    flagmustnotbounce = 1;
+    if (!flagfailclosed)
+      decision = 1;
+    return;
+  }
+  if (text.len)
+    decision = 1;
+}
+
+char strnum[FMT_ULONG];
+static stralloc message;
+
+char outspace[1]; buffer out = BUFFER_INIT(write,1,outspace,sizeof outspace);
+
+void rblspp(void)
+{
+  int i;
+
+  if (flagmustnotbounce || (decision == 2)) {
+    if (!stralloc_copys(&message,"E451 ")) nomem();
+  }
+  else
+    if (!stralloc_copys(&message,"E553 ")) nomem();
+
+  if (text.len > 200) text.len = 200;
+  if (!stralloc_cat(&message,&text)) nomem();
+  for (i = 0;i < message.len;++i)
+    if ((message.s[i] < 32) || (message.s[i] > 126))
+      message.s[i] = '?';
+  
+  buffer_puts(buffer_2,"rblspp: ");
+  buffer_puts(buffer_2,ip_env);
+  buffer_puts(buffer_2," pid ");
+  buffer_put(buffer_2,strnum,fmt_ulong(strnum,getppid()));
+  buffer_puts(buffer_2,": ");
+  buffer_put(buffer_2,message.s,message.len);
+  buffer_puts(buffer_2,"\n");
+  buffer_flush(buffer_2);
+
+  if (!stralloc_cats(&message,"\r\n")) nomem();
+
+  buffer_putflush(&out,message.s,message.len);
+
+  _exit(0);
+}
+
+main(int argc,char **argv,char **envp)
+{
+  char *x;
+  int opt;
+  int rcount;
+  
+  x = env_get("SMTPRCPTCOUNT");
+  if (x) {
+    rcount = atoi(x);
+    if (rcount > 0) _exit(0);
+  }
+  
+  ip_init();
+
+  x = env_get("RBLSPP");
+  if (x) {
+    if (!*x)
+      decision = 1;
+    else if (*x == '-') {
+      if (!stralloc_copys(&text,x + 1)) nomem();
+      decision = 3;
+    }
+    else {
+      if (!stralloc_copys(&text,x)) nomem();
+      decision = 2;
+    }
+  }
+  
+  while ((opt = getopt(argc,argv,"bBcCr:a:")) != opteof)
+    switch(opt) {
+      case 'b': flagrblbounce = 1; break;
+      case 'B': flagrblbounce = 0; break;
+      case 'c': flagfailclosed = 1; break;
+      case 'C': flagfailclosed = 0; break;
+      case 'r': rbl(optarg); break;
+      case 'a': antirbl(optarg); break;
+      default: usage();
+    }
+
+  if (decision >= 2) rblspp();
+  
+  _exit(0);
+}