This patch allows you to query postgres database when user is
not found in the local passwd file. I use this patch to query
database with over a 100,000 users and it works quite nice.

To apply the patch untar qmail-1.03.tar.gz and then run
 patch -p0 < pgsql_getpasswd.diff
Compile qmail. The only file that is different from standart qmail
installation is qmail-getpw

To use the database you must setup a table looking like this one:
CREATE TABLE passwd(
    login	VARCHAR(32),
    home	VARCHAR(128),
    uid		int,
    gid		int,
    PRIMARY KEY(login)
)

then create config file /var/qmail/control/pgsql_server with the
following fields in it: host port database username password table

Example /var/qmail/control/pgsql_server
sql.host.com 5432 users sqlusr nopass passwd

To test the installation run qmail-getpw with parameter some username
that you fill in the sql table.

-
Georgi Chorbadzhiyski
georgi@unixsol.org
http://georgi.unixsol.org/


diff -ur qmail-1.03/Makefile qmail-1.03-pgsql/Makefile
--- qmail-1.03/Makefile	Mon Jun 15 13:53:16 1998
+++ qmail-1.03-pgsql/Makefile	Tue Nov 20 13:37:56 2001
@@ -1108,10 +1108,11 @@
 	> qmail-control.5
 
 qmail-getpw: \
-load qmail-getpw.o case.a substdio.a error.a str.a fs.a auto_break.o \
-auto_usera.o
-	./load qmail-getpw case.a substdio.a error.a str.a fs.a \
-	auto_break.o auto_usera.o 
+load qmail-getpw.o case.a control.o getln.a open.a substdio.a error.a str.a \
+fs.a auto_break.o auto_usera.o auto_qmail.o
+	./load qmail-getpw case.a control.o getln.a open.a substdio.a error.a \
+	str.a fs.a stralloc.a alloc.a auto_break.o auto_usera.o auto_qmail.o \
+	-lpq
 
 qmail-getpw.0: \
 qmail-getpw.8
diff -ur qmail-1.03/qmail-getpw.c qmail-1.03-pgsql/qmail-getpw.c
--- qmail-1.03/qmail-getpw.c	Mon Jun 15 13:53:16 1998
+++ qmail-1.03-pgsql/qmail-getpw.c	Tue Nov 20 14:35:12 2001
@@ -1,6 +1,11 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <pwd.h>
+#include <libpq-fe.h>
+#include "open.h"
+#include "control.h"
+#include "stralloc.h"
+#include "auto_qmail.h"
 #include "readwrite.h"
 #include "substdio.h"
 #include "subfd.h"
@@ -21,6 +26,110 @@
 char *dash;
 char *extension;
 
+struct passwd *getpwnam_pgsql(char *username) {
+    int i = 0;
+    int current = 0;
+    char *ptmp;
+    stralloc pghost  = {0};
+    stralloc pgport  = {0};
+    stralloc pgdb    = {0};
+    stralloc pguser  = {0};
+    stralloc pgpass  = {0};
+    stralloc pgtable = {0};
+    stralloc squery  = {0};
+    stralloc pgtmp   = {0};
+    stralloc pwname  = {0};
+    stralloc pwhome  = {0};
+    PGconn *pgconn;
+    PGresult *res;
+    static struct passwd pwd;
+
+    // Sanitize username
+    while (username[i])
+    {
+	if (username[i] == '\'' || username[i] == '\\')
+	    username[i] = ' ';
+	i++;
+    }
+    // Read config
+    if (chdir(auto_qmail) == -1) { return NULL; };
+    if (control_readfile(&pgtmp,"control/pgsql_server",0)) {;
+	ptmp = pgtmp.s;
+	while (*ptmp == ' ' || *ptmp == '\t') {
+	    ptmp++;
+	}
+	while (*ptmp) {
+	    if (*ptmp == ' ' || *ptmp == '\t') {
+		while (*ptmp == ' ' || *ptmp == '\t') {
+		    ptmp++;
+		}
+		current++;
+	    }
+	    if (*ptmp != '\n') {
+		switch (current) {
+		    case 0: stralloc_append(&pghost,ptmp); break;
+		    case 1: stralloc_append(&pgport,ptmp); break;
+		    case 2: stralloc_append(&pgdb,ptmp); break;
+		    case 3: stralloc_append(&pguser,ptmp); break;
+		    case 4: stralloc_append(&pgpass,ptmp); break;
+		    case 5: stralloc_append(&pgtable,ptmp); break;
+		}
+	    }
+	    ptmp++;
+	}
+	if (!pghost.s) { fprintf(stderr,"%s\n","PGhost not defined!"); return NULL; }
+	if (!pgport.s) { fprintf(stderr,"%s\n","PGport not defined!"); return NULL;  }
+	if (!pgdb.s)   { fprintf(stderr,"%s\n","PGdb not defined!");  return NULL; }
+	if (!pguser.s) { fprintf(stderr,"%s\n","PGuser not defined!"); return NULL; }
+	if (!pgpass.s) { fprintf(stderr,"%s\n","PGpass not defined!"); return NULL; }
+	if (!pgtable.s){ fprintf(stderr,"%s\n","PGtable not defined!"); return NULL; }
+	stralloc_cats(&squery,"SELECT login,home,uid,gid FROM ");
+	stralloc_cats(&squery,pgtable.s);
+	stralloc_cats(&squery," WHERE login='");
+	stralloc_cats(&squery,username);
+	stralloc_cats(&squery,"'");
+	stralloc_0(&squery);
+    } else {
+	return NULL;
+    }
+
+    pgconn = PQsetdbLogin (pghost.s,pgport.s,NULL,NULL,pgdb.s,pguser.s,pgpass.s);
+    if (PQstatus (pgconn) == CONNECTION_BAD)
+    {
+	fprintf(stderr, "SQL error: %s", PQerrorMessage(pgconn));
+	PQfinish (pgconn);
+	_exit(QLX_SYS);
+    }
+
+    res = PQexec (pgconn, squery.s);
+    if (!res || PQresultStatus(res) != PGRES_TUPLES_OK || PQntuples(res) == 0)
+    {
+	if (!res || PQresultStatus(res) != PGRES_TUPLES_OK) {
+	    fprintf(stderr, "SQL error: %s", PQerrorMessage(pgconn));
+	}
+	PQclear(res);
+	PQfinish(pgconn);
+	return NULL;
+    }
+
+    stralloc_copys(&pwname, PQgetvalue(res,0,0));
+    stralloc_0(&pwname);
+    stralloc_copys(&pwhome, PQgetvalue(res,0,1));
+    stralloc_0(&pwhome);
+
+    pwd.pw_name  = pwname.s;
+    pwd.pw_dir   = pwhome.s;
+    pwd.pw_uid   = atoi( PQgetvalue (res,0,2) );
+    pwd.pw_gid   = atoi( PQgetvalue (res,0,3) );
+    pwd.pw_gecos = "";
+    pwd.pw_shell = "";
+
+    PQclear(res);
+    PQfinish(pgconn);
+
+    return &pwd;
+}
+
 int userext()
 {
   char username[GETPW_USERLEN];
@@ -36,6 +145,9 @@
 	errno = 0;
 	pw = getpwnam(username);
 	if (errno == error_txtbsy) _exit(QLX_SYS);
+	if (!pw) {
+	    pw = getpwnam_pgsql(username);
+	}
 	if (pw)
 	  if (pw->pw_uid)
 	    if (stat(pw->pw_dir,&st) == 0) {