Adding upstream version 3.4.23.upstream/3.4.23upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 264 insertions, 0 deletions

diff --git a/src/global/rewrite_clnt.c b/src/global/rewrite_clnt.c
new file mode 100644
index 0000000..e11f81a
--- /dev/null
+++ b/src/global/rewrite_clnt.c
@@ -0,0 +1,264 @@
+/*++
+/* NAME
+/*	rewrite_clnt 3
+/* SUMMARY
+/*	address rewrite service client
+/* SYNOPSIS
+/*	#include <vstring.h>
+/*	#include <rewrite_clnt.h>
+/*
+/*	VSTRING	*rewrite_clnt(ruleset, address, result)
+/*	const char *ruleset;
+/*	const char *address;
+/*
+/*	VSTRING	*rewrite_clnt_internal(ruleset, address, result)
+/*	const char *ruleset;
+/*	const char *address;
+/*	VSTRING	*result;
+/* DESCRIPTION
+/*	This module implements a mail address rewriting client.
+/*
+/*	rewrite_clnt() sends a rule set name and external-form address to the
+/*	rewriting service and returns the resulting external-form address.
+/*	In case of communication failure the program keeps trying until the
+/*	mail system shuts down.
+/*
+/*	rewrite_clnt_internal() performs the same functionality but takes
+/*	input in internal (unquoted) form, and produces output in internal
+/*	(unquoted) form.
+/* DIAGNOSTICS
+/*	Warnings: communication failure. Fatal error: mail system is down.
+/* SEE ALSO
+/*	mail_proto(3h) low-level mail component glue.
+/* LICENSE
+/* .ad
+/* .fi
+/*	The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/*	Wietse Venema
+/*	IBM T.J. Watson Research
+/*	P.O. Box 704
+/*	Yorktown Heights, NY 10598, USA
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+
+/* Utility library. */
+
+#include <msg.h>
+#include <vstring.h>
+#include <vstream.h>
+#include <vstring_vstream.h>
+#include <events.h>
+#include <iostuff.h>
+#include <quote_822_local.h>
+
+/* Global library. */
+
+#include "mail_proto.h"
+#include "mail_params.h"
+#include "clnt_stream.h"
+#include "rewrite_clnt.h"
+
+/* Application-specific. */
+
+ /*
+  * XXX this is shared with the resolver client to save a file descriptor.
+  */
+CLNT_STREAM *rewrite_clnt_stream = 0;
+
+static time_t last_expire;
+static VSTRING *last_rule;
+static VSTRING *last_addr;
+static VSTRING *last_result;
+
+/* rewrite_clnt - rewrite address to (transport, next hop, recipient) */
+
+VSTRING *rewrite_clnt(const char *rule, const char *addr, VSTRING *result)
+{
+    VSTREAM *stream;
+    int     server_flags;
+    int     count = 0;
+
+    /*
+     * One-entry cache.
+     */
+    if (last_addr == 0) {
+	last_rule = vstring_alloc(10);
+	last_addr = vstring_alloc(100);
+	last_result = vstring_alloc(100);
+    }
+
+    /*
+     * Sanity check. An address must be in externalized form. The result must
+     * not clobber the input, because we may have to retransmit the query.
+     */
+#define STR vstring_str
+
+    if (*addr == 0)
+	addr = "";
+    if (addr == STR(result))
+	msg_panic("rewrite_clnt: result clobbers input");
+
+    /*
+     * Peek at the cache.
+     */
+    if (time((time_t *) 0) < last_expire
+	&& strcmp(addr, STR(last_addr)) == 0
+	&& strcmp(rule, STR(last_rule)) == 0) {
+	vstring_strcpy(result, STR(last_result));
+	if (msg_verbose)
+	    msg_info("rewrite_clnt: cached: %s: %s -> %s",
+		     rule, addr, vstring_str(result));
+	return (result);
+    }
+
+    /*
+     * Keep trying until we get a complete response. The rewrite service is
+     * CPU bound and making the client asynchronous would just complicate the
+     * code.
+     */
+    if (rewrite_clnt_stream == 0)
+	rewrite_clnt_stream = clnt_stream_create(MAIL_CLASS_PRIVATE,
+						 var_rewrite_service,
+						 var_ipc_idle_limit,
+						 var_ipc_ttl_limit);
+
+    for (;;) {
+	stream = clnt_stream_access(rewrite_clnt_stream);
+	errno = 0;
+	count += 1;
+	if (attr_print(stream, ATTR_FLAG_NONE,
+		       SEND_ATTR_STR(MAIL_ATTR_REQ, REWRITE_ADDR),
+		       SEND_ATTR_STR(MAIL_ATTR_RULE, rule),
+		       SEND_ATTR_STR(MAIL_ATTR_ADDR, addr),
+		       ATTR_TYPE_END) != 0
+	    || vstream_fflush(stream)
+	    || attr_scan(stream, ATTR_FLAG_STRICT,
+			 RECV_ATTR_INT(MAIL_ATTR_FLAGS, &server_flags),
+			 RECV_ATTR_STR(MAIL_ATTR_ADDR, result),
+			 ATTR_TYPE_END) != 2) {
+	    if (msg_verbose || count > 1 || (errno && errno != EPIPE && errno != ENOENT))
+		msg_warn("problem talking to service %s: %m",
+			 var_rewrite_service);
+	} else {
+	    if (msg_verbose)
+		msg_info("rewrite_clnt: %s: %s -> %s",
+			 rule, addr, vstring_str(result));
+	    /* Server-requested disconnect. */
+	    if (server_flags != 0)
+		clnt_stream_recover(rewrite_clnt_stream);
+	    break;
+	}
+	sleep(1);				/* XXX make configurable */
+	clnt_stream_recover(rewrite_clnt_stream);
+    }
+
+    /*
+     * Update the cache.
+     */
+    vstring_strcpy(last_rule, rule);
+    vstring_strcpy(last_addr, addr);
+    vstring_strcpy(last_result, STR(result));
+    last_expire = time((time_t *) 0) + 30;	/* XXX make configurable */
+
+    return (result);
+}
+
+/* rewrite_clnt_internal - rewrite from/to internal form */
+
+VSTRING *rewrite_clnt_internal(const char *ruleset, const char *addr, VSTRING *result)
+{
+    VSTRING *src = vstring_alloc(100);
+    VSTRING *dst = vstring_alloc(100);
+
+    /*
+     * Convert the address from internal address form to external RFC822
+     * form, then rewrite it. After rewriting, convert to internal form.
+     */
+    quote_822_local(src, addr);
+    rewrite_clnt(ruleset, STR(src), dst);
+    unquote_822_local(result, STR(dst));
+    vstring_free(src);
+    vstring_free(dst);
+    return (result);
+}
+
+#ifdef TEST
+
+#include <stdlib.h>
+#include <string.h>
+#include <msg_vstream.h>
+#include <split_at.h>
+#include <vstring_vstream.h>
+#include <mail_conf.h>
+#include <mail_params.h>
+
+static NORETURN usage(char *myname)
+{
+    msg_fatal("usage: %s [-v] [rule address...]", myname);
+}
+
+static void rewrite(char *rule, char *addr, VSTRING *reply)
+{
+    rewrite_clnt(rule, addr, reply);
+    vstream_printf("%-10s %s\n", "rule", rule);
+    vstream_printf("%-10s %s\n", "address", addr);
+    vstream_printf("%-10s %s\n\n", "result", STR(reply));
+    vstream_fflush(VSTREAM_OUT);
+}
+
+int     main(int argc, char **argv)
+{
+    VSTRING *reply;
+    int     ch;
+    char   *rule;
+    char   *addr;
+
+    msg_vstream_init(argv[0], VSTREAM_ERR);
+
+    mail_conf_read();
+    msg_info("using config files in %s", var_config_dir);
+    if (chdir(var_queue_dir) < 0)
+	msg_fatal("chdir %s: %m", var_queue_dir);
+
+    while ((ch = GETOPT(argc, argv, "v")) > 0) {
+	switch (ch) {
+	case 'v':
+	    msg_verbose++;
+	    break;
+	default:
+	    usage(argv[0]);
+	}
+    }
+    reply = vstring_alloc(1);
+
+    if (argc > optind) {
+	for (;;) {
+	    if ((rule = argv[optind++]) == 0)
+		break;
+	    if ((addr = argv[optind++]) == 0)
+		usage(argv[0]);
+	    rewrite(rule, addr, reply);
+	}
+    } else {
+	VSTRING *buffer = vstring_alloc(1);
+
+	while (vstring_fgets_nonl(buffer, VSTREAM_IN)) {
+	    if ((addr = split_at(STR(buffer), ' ')) == 0
+		|| *(rule = STR(buffer)) == 0)
+		usage(argv[0]);
+	    rewrite(rule, addr, reply);
+	}
+	vstring_free(buffer);
+    }
+    vstring_free(reply);
+    exit(0);
+}
+
+#endif