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-rw-r--r--src/global/rewrite_clnt.c264
1 files changed, 264 insertions, 0 deletions
diff --git a/src/global/rewrite_clnt.c b/src/global/rewrite_clnt.c
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+/*++
+/* 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
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