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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 01:46:30 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 01:46:30 +0000
commitb5896ba9f6047e7031e2bdee0622d543e11a6734 (patch)
treefd7b460593a2fee1be579bec5697e6d887ea3421 /src/milter/milter.c
parentInitial commit. (diff)
downloadpostfix-b5896ba9f6047e7031e2bdee0622d543e11a6734.tar.xz
postfix-b5896ba9f6047e7031e2bdee0622d543e11a6734.zip
Adding upstream version 3.4.23.upstream/3.4.23upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/milter/milter.c')
-rw-r--r--src/milter/milter.c1121
1 files changed, 1121 insertions, 0 deletions
diff --git a/src/milter/milter.c b/src/milter/milter.c
new file mode 100644
index 0000000..3d71cc6
--- /dev/null
+++ b/src/milter/milter.c
@@ -0,0 +1,1121 @@
+/*++
+/* NAME
+/* milter 3
+/* SUMMARY
+/* generic MTA-side mail filter interface
+/* SYNOPSIS
+/* #include <milter.h>
+/*
+/* MILTERS *milter_create(milter_names, conn_timeout, cmd_timeout,
+/* msg_timeout, protocol, def_action,
+/* conn_macros, helo_macros,
+/* mail_macros, rcpt_macros,
+/* data_macros, eoh_macros,
+/* eod_macros, unk_macros,
+/* macro_deflts)
+/* const char *milter_names;
+/* int conn_timeout;
+/* int cmd_timeout;
+/* int msg_timeout;
+/* const char *protocol;
+/* const char *def_action;
+/* const char *conn_macros;
+/* const char *helo_macros;
+/* const char *mail_macros;
+/* const char *rcpt_macrps;
+/* const char *data_macros;
+/* const char *eoh_macros;
+/* const char *eod_macros;
+/* const char *unk_macros;
+/* const char *macro_deflts;
+/*
+/* void milter_free(milters)
+/* MILTERS *milters;
+/*
+/* void milter_macro_callback(milters, mac_lookup, mac_context)
+/* const char *(*mac_lookup)(const char *name, void *context);
+/* void *mac_context;
+/*
+/* void milter_edit_callback(milters, add_header, upd_header,
+/* ins_header, del_header, chg_from,
+/* add_rcpt, add_rcpt_par, del_rcpt,
+/* repl_body, context)
+/* MILTERS *milters;
+/* MILTER_ADD_HEADER_FN add_header;
+/* MILTER_EDIT_HEADER_FN upd_header;
+/* MILTER_EDIT_HEADER_FN ins_header;
+/* MILTER_DEL_HEADER_FN del_header;
+/* MILTER_EDIT_FROM_FN chg_from;
+/* MILTER_EDIT_RCPT_FN add_rcpt;
+/* MILTER_EDIT_RCPT_PAR_FN add_rcpt_par;
+/* MILTER_EDIT_RCPT_FN del_rcpt;
+/* MILTER_EDIT_BODY_FN repl_body;
+/* void *context;
+/*
+/* const char *milter_conn_event(milters, client_name, client_addr,
+/* client_port, addr_family)
+/* MILTERS *milters;
+/* const char *client_name;
+/* const char *client_addr;
+/* const char *client_port;
+/* int addr_family;
+/*
+/* const char *milter_disc_event(milters)
+/* MILTERS *milters;
+/*
+/* const char *milter_helo_event(milters, helo_name, esmtp_flag)
+/* MILTERS *milters;
+/* const char *helo_name;
+/* int esmtp_flag;
+/*
+/* const char *milter_mail_event(milters, argv)
+/* MILTERS *milters;
+/* const char **argv;
+/*
+/* const char *milter_rcpt_event(milters, flags, argv)
+/* MILTERS *milters;
+/* int flags;
+/* const char **argv;
+/*
+/* const char *milter_data_event(milters)
+/* MILTERS *milters;
+/*
+/* const char *milter_unknown_event(milters, command)
+/* MILTERS *milters;
+/* const char *command;
+/*
+/* const char *milter_other_event(milters)
+/* MILTERS *milters;
+/*
+/* const char *milter_message(milters, qfile, data_offset, auto_hdrs)
+/* MILTERS *milters;
+/* VSTREAM *qfile;
+/* off_t data_offset;
+/* ARGV *auto_hdrs;
+/*
+/* const char *milter_abort(milters)
+/* MILTERS *milters;
+/*
+/* int milter_send(milters, fp)
+/* MILTERS *milters;
+/* VSTREAM *fp;
+/*
+/* MILTERS *milter_receive(fp, count)
+/* VSTREAM *fp;
+/* int count;
+/*
+/* int milter_dummy(milters, fp)
+/* MILTERS *milters;
+/* VSTREAM *fp;
+/* DESCRIPTION
+/* The functions in this module manage one or more milter (mail
+/* filter) clients. Currently, only the Sendmail 8 filter
+/* protocol is supported.
+/*
+/* The functions that inspect content or envelope commands
+/* return either an SMTP reply ([45]XX followed by enhanced
+/* status code and text), "D" (discard), "H" (quarantine),
+/* "S" (shutdown connection), or a null pointer, which means
+/* "no news is good news".
+/*
+/* milter_create() instantiates the milter clients specified
+/* with the milter_names argument. The conn_macros etc.
+/* arguments specify the names of macros that are sent to the
+/* mail filter applications upon a connect etc. event, and the
+/* macro_deflts argument specifies macro defaults that will be used
+/* only if the application's lookup call-back returns null. This
+/* function should be called during process initialization,
+/* before entering a chroot jail. The timeout parameters specify
+/* time limits for the completion of the specified request
+/* classes. The protocol parameter specifies a protocol version
+/* and optional extensions. When the milter application is
+/* unavailable, the milter client will go into a suitable error
+/* state as specified with the def_action parameter (i.e.
+/* reject, tempfail or accept all subsequent events).
+/*
+/* milter_free() disconnects from the milter instances that
+/* are still opened, and destroys the data structures created
+/* by milter_create(). This function is safe to call at any
+/* point after milter_create().
+/*
+/* milter_macro_callback() specifies a call-back function and
+/* context for macro lookup. This function must be called
+/* before milter_conn_event().
+/*
+/* milter_edit_callback() specifies call-back functions and
+/* context for editing the queue file after the end-of-data
+/* is received. This function must be called before milter_message();
+/*
+/* milter_conn_event() reports an SMTP client connection event
+/* to the specified milter instances, after sending the macros
+/* specified with the milter_create() conn_macros argument.
+/* This function must be called before reporting any other
+/* events.
+/*
+/* milter_disc_event() reports an SMTP client disconnection
+/* event to the specified milter instances. No events can
+/* reported after this call. To simplify usage, redundant calls
+/* of this function are NO-OPs and don't raise a run-time
+/* error.
+/*
+/* milter_helo_event() reports a HELO or EHLO event to the
+/* specified milter instances, after sending the macros that
+/* were specified with the milter_create() helo_macros argument.
+/*
+/* milter_mail_event() reports a MAIL FROM event to the specified
+/* milter instances, after sending the macros that were specified
+/* with the milter_create() mail_macros argument.
+/*
+/* milter_rcpt_event() reports an RCPT TO event to the specified
+/* milter instances, after sending the macros that were specified
+/* with the milter_create() rcpt_macros argument. The flags
+/* argument supports the following:
+/* .IP MILTER_FLAG_WANT_RCPT_REJ
+/* When this flag is cleared, invoke all milters. When this
+/* flag is set, invoke only milters that want to receive
+/* rejected recipients; with Sendmail V8 Milters, {rcpt_mailer}
+/* is set to "error", {rcpt_host} is set to an enhanced status
+/* code, and {rcpt_addr} is set to descriptive text.
+/* .PP
+/* milter_data_event() reports a DATA event to the specified
+/* milter instances, after sending the macros that were specified
+/* with the milter_create() data_macros argument.
+/*
+/* milter_unknown_event() reports an unknown command event to
+/* the specified milter instances, after sending the macros
+/* that were specified with the milter_create() unk_macros
+/* argument.
+/*
+/* milter_other_event() returns the current default mail filter
+/* reply for the current SMTP connection state; it does not
+/* change milter states. A null pointer result means that all
+/* is well. This function can be used for SMTP commands such
+/* as AUTH, STARTTLS that don't have their own milter event
+/* routine.
+/*
+/* milter_message() sends the message header and body to the
+/* to the specified milter instances, and sends the macros
+/* specified with the milter_create() eoh_macros after the
+/* message header, and with the eod_macros argument at
+/* the end. Each milter sees the result of any changes made
+/* by a preceding milter. This function must be called with
+/* as argument an open Postfix queue file.
+/*
+/* milter_abort() cancels a mail transaction in progress. To
+/* simplify usage, redundant calls of this function are NO-OPs
+/* and don't raise a run-time error.
+/*
+/* milter_send() sends a list of mail filters over the specified
+/* stream. When given a null list pointer, a "no filter"
+/* indication is sent. The result is non-zero in case of
+/* error.
+/*
+/* milter_receive() receives the specified number of mail
+/* filters over the specified stream. The result is a null
+/* pointer when no milters were sent, or when an error happened.
+/*
+/* milter_dummy() is like milter_send(), except that it sends
+/* a dummy, but entirely valid, mail filter list.
+/* SEE ALSO
+/* milter8(3) Sendmail 8 Milter protocol
+/* DIAGNOSTICS
+/* Panic: interface violation.
+/* Fatal errors: memory allocation problem.
+/* 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
+/*
+/* Wietse Venema
+/* Google, Inc.
+/* 111 8th Avenue
+/* New York, NY 10011, USA
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+
+/* Utility library. */
+
+#include <msg.h>
+#include <mymalloc.h>
+#include <stringops.h>
+#include <argv.h>
+#include <attr.h>
+#include <htable.h>
+
+/* Global library. */
+
+#include <mail_proto.h>
+#include <record.h>
+#include <rec_type.h>
+#include <mail_params.h>
+#include <attr_override.h>
+
+/* Postfix Milter library. */
+
+#include <milter.h>
+
+/* Application-specific. */
+
+ /*
+ * SLMs.
+ */
+#define STR(x) vstring_str(x)
+
+/* milter_macro_defaults_create - parse default macro entries */
+
+HTABLE *milter_macro_defaults_create(const char *macro_defaults)
+{
+ const char myname[] = "milter_macro_defaults_create";
+ char *saved_defaults = mystrdup(macro_defaults);
+ char *cp = saved_defaults;
+ HTABLE *table = 0;
+ VSTRING *canon_buf = 0;
+ char *nameval;
+
+ while ((nameval = mystrtokq(&cp, CHARS_COMMA_SP, CHARS_BRACE)) != 0) {
+ const char *err;
+ char *name;
+ char *value;
+
+ /*
+ * Split the input into (name, value) pairs. Allow the forms
+ * name=value and { name = value }, where the last form ignores
+ * whitespace after the opening "{", around the "=", and before the
+ * closing "}". A name may also be specified as {name}.
+ *
+ * Use the form {name} for table lookups, because that is the form of
+ * the S8_MAC_* macro names.
+ */
+ if (*nameval == CHARS_BRACE[0]
+ && nameval[balpar(nameval, CHARS_BRACE)] != '='
+ && (err = extpar(&nameval, CHARS_BRACE, EXTPAR_FLAG_NONE)) != 0)
+ msg_fatal("malformed default macro entry: %s in \"%s\"",
+ err, macro_defaults);
+ if ((err = split_nameval(nameval, &name, &value)) != 0)
+ msg_fatal("malformed default macro entry: %s in \"%s\"",
+ err, macro_defaults);
+ if (*name != '{') /* } */
+ name = STR(vstring_sprintf(canon_buf ? canon_buf :
+ (canon_buf = vstring_alloc(20)), "{%s}", name));
+ if (table == 0)
+ table = htable_create(1);
+ if (htable_find(table, name) != 0) {
+ msg_warn("ignoring multiple default macro entries for %s in \"%s\"",
+ name, macro_defaults);
+ } else {
+ (void) htable_enter(table, name, mystrdup(value));
+ if (msg_verbose)
+ msg_info("%s: add name=%s default=%s", myname, name, value);
+ }
+ }
+ myfree(saved_defaults);
+ if (canon_buf)
+ vstring_free(canon_buf);
+ return (table);
+}
+
+/* milter_macro_lookup - look up macros */
+
+static ARGV *milter_macro_lookup(MILTERS *milters, const char *macro_names)
+{
+ const char *myname = "milter_macro_lookup";
+ char *saved_names = mystrdup(macro_names);
+ char *cp = saved_names;
+ ARGV *argv = argv_alloc(10);
+ VSTRING *canon_buf = vstring_alloc(20);
+ const char *value;
+ const char *name;
+ const char *cname;
+
+ while ((name = mystrtok(&cp, CHARS_COMMA_SP)) != 0) {
+ if (msg_verbose)
+ msg_info("%s: \"%s\"", myname, name);
+ if (*name != '{') /* } */
+ cname = STR(vstring_sprintf(canon_buf, "{%s}", name));
+ else
+ cname = name;
+ if ((value = milters->mac_lookup(cname, milters->mac_context)) != 0) {
+ if (msg_verbose)
+ msg_info("%s: result \"%s\"", myname, value);
+ argv_add(argv, name, value, (char *) 0);
+ } else if (milters->macro_defaults != 0
+ && (value = htable_find(milters->macro_defaults, cname)) != 0) {
+ if (msg_verbose)
+ msg_info("%s: using default \"%s\"", myname, value);
+ argv_add(argv, name, value, (char *) 0);
+ }
+ }
+ myfree(saved_names);
+ vstring_free(canon_buf);
+ return (argv);
+}
+
+/* milter_macro_callback - specify macro lookup */
+
+void milter_macro_callback(MILTERS *milters,
+ const char *(*mac_lookup) (const char *, void *),
+ void *mac_context)
+{
+ milters->mac_lookup = mac_lookup;
+ milters->mac_context = mac_context;
+}
+
+/* milter_edit_callback - specify queue file edit call-back information */
+
+void milter_edit_callback(MILTERS *milters,
+ MILTER_ADD_HEADER_FN add_header,
+ MILTER_EDIT_HEADER_FN upd_header,
+ MILTER_EDIT_HEADER_FN ins_header,
+ MILTER_DEL_HEADER_FN del_header,
+ MILTER_EDIT_FROM_FN chg_from,
+ MILTER_EDIT_RCPT_FN add_rcpt,
+ MILTER_EDIT_RCPT_PAR_FN add_rcpt_par,
+ MILTER_EDIT_RCPT_FN del_rcpt,
+ MILTER_EDIT_BODY_FN repl_body,
+ void *chg_context)
+{
+ milters->add_header = add_header;
+ milters->upd_header = upd_header;
+ milters->ins_header = ins_header;
+ milters->del_header = del_header;
+ milters->chg_from = chg_from;
+ milters->add_rcpt = add_rcpt;
+ milters->add_rcpt_par = add_rcpt_par;
+ milters->del_rcpt = del_rcpt;
+ milters->repl_body = repl_body;
+ milters->chg_context = chg_context;
+}
+
+/* milter_conn_event - report connect event */
+
+const char *milter_conn_event(MILTERS *milters,
+ const char *client_name,
+ const char *client_addr,
+ const char *client_port,
+ unsigned addr_family)
+{
+ const char *resp;
+ MILTER *m;
+ ARGV *global_macros = 0;
+ ARGV *any_macros;
+
+#define MILTER_MACRO_EVAL(global_macros, m, milters, member) \
+ ((m->macros && m->macros->member[0]) ? \
+ milter_macro_lookup(milters, m->macros->member) : \
+ global_macros ? global_macros : \
+ (global_macros = \
+ milter_macro_lookup(milters, milters->macros->member)))
+
+ if (msg_verbose)
+ msg_info("report connect to all milters");
+ for (resp = 0, m = milters->milter_list; resp == 0 && m != 0; m = m->next) {
+ if (m->connect_on_demand != 0)
+ m->connect_on_demand(m);
+ any_macros = MILTER_MACRO_EVAL(global_macros, m, milters, conn_macros);
+ resp = m->conn_event(m, client_name, client_addr, client_port,
+ addr_family, any_macros);
+ if (any_macros != global_macros)
+ argv_free(any_macros);
+ }
+ if (global_macros)
+ argv_free(global_macros);
+ return (resp);
+}
+
+/* milter_helo_event - report helo event */
+
+const char *milter_helo_event(MILTERS *milters, const char *helo_name,
+ int esmtp_flag)
+{
+ const char *resp;
+ MILTER *m;
+ ARGV *global_macros = 0;
+ ARGV *any_macros;
+
+ if (msg_verbose)
+ msg_info("report helo to all milters");
+ for (resp = 0, m = milters->milter_list; resp == 0 && m != 0; m = m->next) {
+ any_macros = MILTER_MACRO_EVAL(global_macros, m, milters, helo_macros);
+ resp = m->helo_event(m, helo_name, esmtp_flag, any_macros);
+ if (any_macros != global_macros)
+ argv_free(any_macros);
+ }
+ if (global_macros)
+ argv_free(global_macros);
+ return (resp);
+}
+
+/* milter_mail_event - report mail from event */
+
+const char *milter_mail_event(MILTERS *milters, const char **argv)
+{
+ const char *resp;
+ MILTER *m;
+ ARGV *global_macros = 0;
+ ARGV *any_macros;
+
+ if (msg_verbose)
+ msg_info("report sender to all milters");
+ for (resp = 0, m = milters->milter_list; resp == 0 && m != 0; m = m->next) {
+ any_macros = MILTER_MACRO_EVAL(global_macros, m, milters, mail_macros);
+ resp = m->mail_event(m, argv, any_macros);
+ if (any_macros != global_macros)
+ argv_free(any_macros);
+ }
+ if (global_macros)
+ argv_free(global_macros);
+ return (resp);
+}
+
+/* milter_rcpt_event - report rcpt to event */
+
+const char *milter_rcpt_event(MILTERS *milters, int flags, const char **argv)
+{
+ const char *resp;
+ MILTER *m;
+ ARGV *global_macros = 0;
+ ARGV *any_macros;
+
+ if (msg_verbose)
+ msg_info("report recipient to all milters (flags=0x%x)", flags);
+ for (resp = 0, m = milters->milter_list; resp == 0 && m != 0; m = m->next) {
+ if ((flags & MILTER_FLAG_WANT_RCPT_REJ) == 0
+ || (m->flags & MILTER_FLAG_WANT_RCPT_REJ) != 0) {
+ any_macros =
+ MILTER_MACRO_EVAL(global_macros, m, milters, rcpt_macros);
+ resp = m->rcpt_event(m, argv, any_macros);
+ if (any_macros != global_macros)
+ argv_free(any_macros);
+ }
+ }
+ if (global_macros)
+ argv_free(global_macros);
+ return (resp);
+}
+
+/* milter_data_event - report data event */
+
+const char *milter_data_event(MILTERS *milters)
+{
+ const char *resp;
+ MILTER *m;
+ ARGV *global_macros = 0;
+ ARGV *any_macros;
+
+ if (msg_verbose)
+ msg_info("report data to all milters");
+ for (resp = 0, m = milters->milter_list; resp == 0 && m != 0; m = m->next) {
+ any_macros = MILTER_MACRO_EVAL(global_macros, m, milters, data_macros);
+ resp = m->data_event(m, any_macros);
+ if (any_macros != global_macros)
+ argv_free(any_macros);
+ }
+ if (global_macros)
+ argv_free(global_macros);
+ return (resp);
+}
+
+/* milter_unknown_event - report unknown command */
+
+const char *milter_unknown_event(MILTERS *milters, const char *command)
+{
+ const char *resp;
+ MILTER *m;
+ ARGV *global_macros = 0;
+ ARGV *any_macros;
+
+ if (msg_verbose)
+ msg_info("report unknown command to all milters");
+ for (resp = 0, m = milters->milter_list; resp == 0 && m != 0; m = m->next) {
+ any_macros = MILTER_MACRO_EVAL(global_macros, m, milters, unk_macros);
+ resp = m->unknown_event(m, command, any_macros);
+ if (any_macros != global_macros)
+ argv_free(any_macros);
+ }
+ if (global_macros)
+ argv_free(global_macros);
+ return (resp);
+}
+
+/* milter_other_event - other SMTP event */
+
+const char *milter_other_event(MILTERS *milters)
+{
+ const char *resp;
+ MILTER *m;
+
+ if (msg_verbose)
+ msg_info("query milter states for other event");
+ for (resp = 0, m = milters->milter_list; resp == 0 && m != 0; m = m->next)
+ resp = m->other_event(m);
+ return (resp);
+}
+
+/* milter_message - inspect message content */
+
+const char *milter_message(MILTERS *milters, VSTREAM *fp, off_t data_offset,
+ ARGV *auto_hdrs)
+{
+ const char *resp;
+ MILTER *m;
+ ARGV *global_eoh_macros = 0;
+ ARGV *global_eod_macros = 0;
+ ARGV *any_eoh_macros;
+ ARGV *any_eod_macros;
+
+ if (msg_verbose)
+ msg_info("inspect content by all milters");
+ for (resp = 0, m = milters->milter_list; resp == 0 && m != 0; m = m->next) {
+ any_eoh_macros = MILTER_MACRO_EVAL(global_eoh_macros, m, milters, eoh_macros);
+ any_eod_macros = MILTER_MACRO_EVAL(global_eod_macros, m, milters, eod_macros);
+ resp = m->message(m, fp, data_offset, any_eoh_macros, any_eod_macros,
+ auto_hdrs);
+ if (any_eoh_macros != global_eoh_macros)
+ argv_free(any_eoh_macros);
+ if (any_eod_macros != global_eod_macros)
+ argv_free(any_eod_macros);
+ }
+ if (global_eoh_macros)
+ argv_free(global_eoh_macros);
+ if (global_eod_macros)
+ argv_free(global_eod_macros);
+ return (resp);
+}
+
+/* milter_abort - cancel message receiving state, all milters */
+
+void milter_abort(MILTERS *milters)
+{
+ MILTER *m;
+
+ if (msg_verbose)
+ msg_info("abort all milters");
+ for (m = milters->milter_list; m != 0; m = m->next)
+ m->abort(m);
+}
+
+/* milter_disc_event - report client disconnect event to all milters */
+
+void milter_disc_event(MILTERS *milters)
+{
+ MILTER *m;
+
+ if (msg_verbose)
+ msg_info("disconnect event to all milters");
+ for (m = milters->milter_list; m != 0; m = m->next)
+ m->disc_event(m);
+}
+
+ /*
+ * Table-driven parsing of main.cf parameter overrides for specific Milters.
+ * We derive the override names from the corresponding main.cf parameter
+ * names by skipping the redundant "milter_" prefix.
+ */
+static ATTR_OVER_TIME time_table[] = {
+ 7 + (const char *) VAR_MILT_CONN_TIME, DEF_MILT_CONN_TIME, 0, 1, 0,
+ 7 + (const char *) VAR_MILT_CMD_TIME, DEF_MILT_CMD_TIME, 0, 1, 0,
+ 7 + (const char *) VAR_MILT_MSG_TIME, DEF_MILT_MSG_TIME, 0, 1, 0,
+ 0,
+};
+static ATTR_OVER_STR str_table[] = {
+ 7 + (const char *) VAR_MILT_PROTOCOL, 0, 1, 0,
+ 7 + (const char *) VAR_MILT_DEF_ACTION, 0, 1, 0,
+ 0,
+};
+
+#define link_override_table_to_variable(table, var) \
+ do { table[var##_offset].target = &var; } while (0)
+
+#define my_conn_timeout_offset 0
+#define my_cmd_timeout_offset 1
+#define my_msg_timeout_offset 2
+
+#define my_protocol_offset 0
+#define my_def_action_offset 1
+
+/* milter_new - create milter list */
+
+MILTERS *milter_new(const char *names,
+ int conn_timeout,
+ int cmd_timeout,
+ int msg_timeout,
+ const char *protocol,
+ const char *def_action,
+ MILTER_MACROS *macros,
+ HTABLE *macro_defaults)
+{
+ MILTERS *milters;
+ MILTER *head = 0;
+ MILTER *tail = 0;
+ char *name;
+ MILTER *milter;
+ const char *sep = CHARS_COMMA_SP;
+ const char *parens = CHARS_BRACE;
+ int my_conn_timeout;
+ int my_cmd_timeout;
+ int my_msg_timeout;
+ const char *my_protocol;
+ const char *my_def_action;
+
+ /*
+ * Initialize.
+ */
+ link_override_table_to_variable(time_table, my_conn_timeout);
+ link_override_table_to_variable(time_table, my_cmd_timeout);
+ link_override_table_to_variable(time_table, my_msg_timeout);
+ link_override_table_to_variable(str_table, my_protocol);
+ link_override_table_to_variable(str_table, my_def_action);
+
+ /*
+ * Parse the milter list.
+ */
+ milters = (MILTERS *) mymalloc(sizeof(*milters));
+ if (names != 0 && *names != 0) {
+ char *saved_names = mystrdup(names);
+ char *cp = saved_names;
+ char *op;
+ char *err;
+
+ /*
+ * Instantiate Milters, allowing for per-Milter overrides.
+ */
+ while ((name = mystrtokq(&cp, sep, parens)) != 0) {
+ my_conn_timeout = conn_timeout;
+ my_cmd_timeout = cmd_timeout;
+ my_msg_timeout = msg_timeout;
+ my_protocol = protocol;
+ my_def_action = def_action;
+ if (name[0] == parens[0]) {
+ op = name;
+ if ((err = extpar(&op, parens, EXTPAR_FLAG_NONE)) != 0)
+ msg_fatal("milter service syntax error: %s", err);
+ if ((name = mystrtok(&op, sep)) == 0)
+ msg_fatal("empty milter definition: \"%s\"", names);
+ attr_override(op, sep, parens,
+ CA_ATTR_OVER_STR_TABLE(str_table),
+ CA_ATTR_OVER_TIME_TABLE(time_table),
+ CA_ATTR_OVER_END);
+ }
+ milter = milter8_create(name, my_conn_timeout, my_cmd_timeout,
+ my_msg_timeout, my_protocol,
+ my_def_action, milters);
+ if (head == 0) {
+ head = milter;
+ } else {
+ tail->next = milter;
+ }
+ tail = milter;
+ }
+ myfree(saved_names);
+ }
+ milters->milter_list = head;
+ milters->mac_lookup = 0;
+ milters->mac_context = 0;
+ milters->macros = macros;
+ milters->macro_defaults = macro_defaults;
+ milters->add_header = 0;
+ milters->upd_header = milters->ins_header = 0;
+ milters->del_header = 0;
+ milters->add_rcpt = milters->del_rcpt = 0;
+ milters->repl_body = 0;
+ milters->chg_context = 0;
+ return (milters);
+}
+
+/* milter_free - destroy all milters */
+
+void milter_free(MILTERS *milters)
+{
+ MILTER *m;
+ MILTER *next;
+
+ if (msg_verbose)
+ msg_info("free all milters");
+ for (m = milters->milter_list; m != 0; m = next)
+ next = m->next, m->free(m);
+ if (milters->macros)
+ milter_macros_free(milters->macros);
+ if (milters->macro_defaults)
+ htable_free(milters->macro_defaults, myfree);
+ myfree((void *) milters);
+}
+
+/* milter_dummy - send empty milter list */
+
+int milter_dummy(MILTERS *milters, VSTREAM *stream)
+{
+ MILTERS dummy = *milters;
+
+ dummy.milter_list = 0;
+ return (milter_send(&dummy, stream));
+}
+
+/* milter_send - send Milter instances over stream */
+
+int milter_send(MILTERS *milters, VSTREAM *stream)
+{
+ MILTER *m;
+ int status = 0;
+ int count = 0;
+
+ /*
+ * XXX Optimization: send only the filters that are actually used in the
+ * remote process. No point sending a filter that looks at HELO commands
+ * to a cleanup server. For now we skip only the filters that are known
+ * to be disabled (either in global error state or in global accept
+ * state).
+ *
+ * XXX We must send *some* information, even when there are no active
+ * filters, otherwise the cleanup server would try to apply its own
+ * non_smtpd_milters settings.
+ */
+ if (milters != 0)
+ for (m = milters->milter_list; m != 0; m = m->next)
+ if (m->active(m))
+ count++;
+ (void) rec_fprintf(stream, REC_TYPE_MILT_COUNT, "%d", count);
+
+ if (msg_verbose)
+ msg_info("send %d milters", count);
+
+ /*
+ * XXX Optimization: don't send or receive further information when there
+ * aren't any active filters.
+ */
+ if (count <= 0)
+ return (0);
+
+ /*
+ * Send the filter macro name lists.
+ */
+ (void) attr_print(stream, ATTR_FLAG_MORE,
+ SEND_ATTR_FUNC(milter_macros_print,
+ (void *) milters->macros),
+ ATTR_TYPE_END);
+
+ /*
+ * Send the filter macro defaults.
+ */
+ count = milters->macro_defaults ? milters->macro_defaults->used : 0;
+ (void) attr_print(stream, ATTR_FLAG_MORE,
+ SEND_ATTR_INT(MAIL_ATTR_SIZE, count),
+ ATTR_TYPE_END);
+ if (count > 0)
+ (void) attr_print(stream, ATTR_FLAG_MORE,
+ SEND_ATTR_HASH(milters->macro_defaults),
+ ATTR_TYPE_END);
+
+ /*
+ * Send the filter instances.
+ */
+ for (m = milters->milter_list; m != 0; m = m->next)
+ if (m->active(m) && (status = m->send(m, stream)) != 0)
+ break;
+
+ /*
+ * Over to you.
+ */
+ if (status != 0
+ || attr_scan(stream, ATTR_FLAG_STRICT,
+ RECV_ATTR_INT(MAIL_ATTR_STATUS, &status),
+ ATTR_TYPE_END) != 1
+ || status != 0) {
+ msg_warn("cannot send milters to service %s", VSTREAM_PATH(stream));
+ return (-1);
+ }
+ return (0);
+}
+
+/* milter_receive - receive milters from stream */
+
+MILTERS *milter_receive(VSTREAM *stream, int count)
+{
+ MILTERS *milters;
+ MILTER *head = 0;
+ MILTER *tail = 0;
+ MILTER *milter = 0;
+ int macro_default_count;
+
+ if (msg_verbose)
+ msg_info("receive %d milters", count);
+
+ /*
+ * XXX We must instantiate a MILTERS structure even when the sender has
+ * no active filters, otherwise the cleanup server would try to use its
+ * own non_smtpd_milters settings.
+ */
+#define NO_MILTERS ((char *) 0)
+#define NO_TIMEOUTS 0, 0, 0
+#define NO_PROTOCOL ((char *) 0)
+#define NO_ACTION ((char *) 0)
+#define NO_MACROS ((MILTER_MACROS *) 0)
+#define NO_MACRO_DEFLTS ((HTABLE *) 0)
+
+ milters = milter_new(NO_MILTERS, NO_TIMEOUTS, NO_PROTOCOL, NO_ACTION,
+ NO_MACROS, NO_MACRO_DEFLTS);
+
+ /*
+ * XXX Optimization: don't send or receive further information when there
+ * aren't any active filters.
+ */
+ if (count <= 0)
+ return (milters);
+
+ /*
+ * Receive the global macro name lists.
+ */
+ milters->macros = milter_macros_alloc(MILTER_MACROS_ALLOC_ZERO);
+ if (attr_scan(stream, ATTR_FLAG_STRICT | ATTR_FLAG_MORE,
+ RECV_ATTR_FUNC(milter_macros_scan,
+ (void *) milters->macros),
+ ATTR_TYPE_END) != 1) {
+ milter_free(milters);
+ return (0);
+ }
+
+ /*
+ * Receive the filter macro defaults.
+ */
+ if (attr_scan(stream, ATTR_FLAG_STRICT | ATTR_FLAG_MORE,
+ RECV_ATTR_INT(MAIL_ATTR_SIZE, &macro_default_count),
+ ATTR_TYPE_END) != 1
+ || (macro_default_count > 0
+ && attr_scan(stream, ATTR_FLAG_STRICT | ATTR_FLAG_MORE,
+ RECV_ATTR_HASH(milters->macro_defaults
+ = htable_create(1)),
+ ATTR_TYPE_END) != macro_default_count)) {
+ milter_free(milters);
+ return (0);
+ }
+
+ /*
+ * Receive the filters.
+ */
+ for (; count > 0; count--) {
+ if ((milter = milter8_receive(stream, milters)) == 0) {
+ msg_warn("cannot receive milters via service %s socket",
+ VSTREAM_PATH(stream));
+ milter_free(milters);
+ return (0);
+ }
+ if (head == 0) {
+ /* Coverity: milter_free() depends on milters->milter_list. */
+ milters->milter_list = head = milter;
+ } else {
+ tail->next = milter;
+ }
+ tail = milter;
+ }
+
+ /*
+ * Over to you.
+ */
+ (void) attr_print(stream, ATTR_FLAG_NONE,
+ SEND_ATTR_INT(MAIL_ATTR_STATUS, 0),
+ ATTR_TYPE_END);
+ return (milters);
+}
+
+#ifdef TEST
+
+ /*
+ * Proof-of-concept test program. This can be used interactively, but is
+ * typically used for automated regression tests from a script.
+ */
+
+/* System library. */
+
+#include <sys/socket.h>
+#include <stdlib.h>
+#include <string.h>
+
+/* Utility library. */
+
+#include "msg_vstream.h"
+#include "vstring_vstream.h"
+
+/* Global library. */
+
+#include <mail_params.h>
+
+int var_milt_conn_time = 10;
+int var_milt_cmd_time = 10;
+int var_milt_msg_time = 100;
+char *var_milt_protocol = DEF_MILT_PROTOCOL;
+char *var_milt_def_action = DEF_MILT_DEF_ACTION;
+
+static void usage(void)
+{
+ vstream_fprintf(VSTREAM_ERR, "usage: \n"
+ " create names... create and connect\n"
+#if 0
+ " conn_macros names... define connect macros\n"
+ " helo_macros names... define helo command macros\n"
+ " mail_macros names... define mail command macros\n"
+ " rcpt_macros names... define rcpt command macros\n"
+ " data_macros names... define data command macros\n"
+ " unk_macros names... unknown command macros\n"
+ " message_macros names... define message macros\n"
+#endif
+ " free disconnect and destroy\n"
+ " connect name addr port family\n"
+ " helo hostname\n"
+ " ehlo hostname\n"
+ " mail from sender...\n"
+ " rcpt to recipient...\n"
+ " data\n"
+ " disconnect\n"
+ " unknown command\n");
+ vstream_fflush(VSTREAM_ERR);
+}
+
+int main(int argc, char **argv)
+{
+ MILTERS *milters = 0;
+ char *conn_macros, *helo_macros, *mail_macros, *rcpt_macros;
+ char *data_macros, *eoh_macros, *eod_macros, *unk_macros;
+ char *macro_deflts;
+ VSTRING *inbuf = vstring_alloc(100);
+ char *bufp;
+ char *cmd;
+ int ch;
+ int istty = isatty(vstream_fileno(VSTREAM_IN));
+
+ conn_macros = helo_macros = mail_macros = rcpt_macros = data_macros
+ = eoh_macros = eod_macros = unk_macros = macro_deflts = "";
+
+ msg_vstream_init(argv[0], VSTREAM_ERR);
+ while ((ch = GETOPT(argc, argv, "V:v")) > 0) {
+ switch (ch) {
+ default:
+ msg_fatal("usage: %s [-a action] [-p protocol] [-v]", argv[0]);
+ case 'a':
+ var_milt_def_action = optarg;
+ break;
+ case 'p':
+ var_milt_protocol = optarg;
+ break;
+ case 'v':
+ msg_verbose++;
+ break;
+ }
+ }
+ optind = OPTIND;
+
+ for (;;) {
+ const char *resp = 0;
+ ARGV *argv;
+ char **args;
+
+ if (istty) {
+ vstream_printf("- ");
+ vstream_fflush(VSTREAM_OUT);
+ }
+ if (vstring_fgets_nonl(inbuf, VSTREAM_IN) <= 0)
+ break;
+ bufp = vstring_str(inbuf);
+ if (!istty) {
+ vstream_printf("> %s\n", bufp);
+ vstream_fflush(VSTREAM_OUT);
+ }
+ if (*bufp == '#')
+ continue;
+ cmd = mystrtok(&bufp, " ");
+ if (cmd == 0) {
+ usage();
+ continue;
+ }
+ argv = argv_split(bufp, " ");
+ args = argv->argv;
+ if (strcmp(cmd, "create") == 0 && argv->argc == 1) {
+ if (milters != 0) {
+ msg_warn("deleting existing milters");
+ milter_free(milters);
+ }
+ milters = milter_create(args[0], var_milt_conn_time,
+ var_milt_cmd_time, var_milt_msg_time,
+ var_milt_protocol, var_milt_def_action,
+ conn_macros, helo_macros, mail_macros,
+ rcpt_macros, data_macros, eoh_macros,
+ eod_macros, unk_macros, macro_deflts);
+ } else if (strcmp(cmd, "free") == 0 && argv->argc == 0) {
+ if (milters == 0) {
+ msg_warn("no milters");
+ continue;
+ }
+ milter_free(milters);
+ milters = 0;
+ } else if (strcmp(cmd, "connect") == 0 && argv->argc == 4) {
+ if (milters == 0) {
+ msg_warn("no milters");
+ continue;
+ }
+ resp = milter_conn_event(milters, args[0], args[1], args[2],
+ strcmp(args[3], "AF_INET") == 0 ? AF_INET :
+ strcmp(args[3], "AF_INET6") == 0 ? AF_INET6 :
+ strcmp(args[3], "AF_UNIX") == 0 ? AF_UNIX :
+ AF_UNSPEC);
+ } else if (strcmp(cmd, "helo") == 0 && argv->argc == 1) {
+ if (milters == 0) {
+ msg_warn("no milters");
+ continue;
+ }
+ resp = milter_helo_event(milters, args[0], 0);
+ } else if (strcmp(cmd, "ehlo") == 0 && argv->argc == 1) {
+ if (milters == 0) {
+ msg_warn("no milters");
+ continue;
+ }
+ resp = milter_helo_event(milters, args[0], 1);
+ } else if (strcmp(cmd, "mail") == 0 && argv->argc > 0) {
+ if (milters == 0) {
+ msg_warn("no milters");
+ continue;
+ }
+ resp = milter_mail_event(milters, (const char **) args);
+ } else if (strcmp(cmd, "rcpt") == 0 && argv->argc > 0) {
+ if (milters == 0) {
+ msg_warn("no milters");
+ continue;
+ }
+ resp = milter_rcpt_event(milters, 0, (const char **) args);
+ } else if (strcmp(cmd, "unknown") == 0 && argv->argc > 0) {
+ if (milters == 0) {
+ msg_warn("no milters");
+ continue;
+ }
+ resp = milter_unknown_event(milters, args[0]);
+ } else if (strcmp(cmd, "data") == 0 && argv->argc == 0) {
+ if (milters == 0) {
+ msg_warn("no milters");
+ continue;
+ }
+ resp = milter_data_event(milters);
+ } else if (strcmp(cmd, "disconnect") == 0 && argv->argc == 0) {
+ if (milters == 0) {
+ msg_warn("no milters");
+ continue;
+ }
+ milter_disc_event(milters);
+ } else {
+ usage();
+ }
+ if (resp != 0)
+ msg_info("%s", resp);
+ argv_free(argv);
+ }
+ if (milters != 0)
+ milter_free(milters);
+ vstring_free(inbuf);
+ return (0);
+}
+
+#endif