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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/milter8.c
parentInitial commit. (diff)
downloadpostfix-upstream/3.4.23.tar.xz
postfix-upstream/3.4.23.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/milter8.c')
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1 files changed, 2911 insertions, 0 deletions
diff --git a/src/milter/milter8.c b/src/milter/milter8.c
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+/*++
+/* NAME
+/* milter8 3
+/* SUMMARY
+/* MTA-side Sendmail 8 Milter protocol
+/* SYNOPSIS
+/* #include <milter8.h>
+/*
+/* MILTER *milter8_create(name, conn_timeout, cmd_timeout, msg_timeout,
+/* protocol, def_action, parent)
+/* const char *name;
+/* int conn_timeout;
+/* int cmd_timeout;
+/* int msg_timeout;
+/* const char *protocol;
+/* const char *def_action;
+/* MILTERS *parent;
+/*
+/* MILTER *milter8_receive(stream)
+/* VSTREAM *stream;
+/* DESCRIPTION
+/* This module implements the MTA side of the Sendmail 8 mail
+/* filter protocol.
+/*
+/* milter8_create() creates a MILTER data structure with virtual
+/* functions that implement a client for the Sendmail 8 Milter
+/* protocol. These virtual functions are then invoked via the
+/* milter(3) interface. The *timeout, protocol and def_action
+/* arguments come directly from milter_create(). The parent
+/* argument specifies a context for content editing.
+/*
+/* milter8_receive() receives a mail filter definition from the
+/* specified stream. The result is zero in case of success.
+/*
+/* Arguments:
+/* .IP name
+/* The Milter application endpoint, either inet:host:port or
+/* unix:/pathname.
+/* DIAGNOSTICS
+/* Panic: interface violation. Fatal errors: out of memory.
+/* CONFIGURATION PARAMETERS
+/* milter8_protocol, protocol version and extensions
+/* SEE ALSO
+/* milter(3) generic Milter interface
+/* 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>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <errno.h>
+#include <stddef.h> /* offsetof() */
+#include <stdlib.h>
+#include <string.h>
+#include <stdarg.h>
+#include <limits.h> /* INT_MAX */
+
+#ifndef SHUT_RDWR
+#define SHUT_RDWR 2
+#endif
+
+#ifdef STRCASECMP_IN_STRINGS_H
+#include <strings.h>
+#endif
+
+/* Utility library. */
+
+#include <msg.h>
+#include <mymalloc.h>
+#include <split_at.h>
+#include <connect.h>
+#include <argv.h>
+#include <name_mask.h>
+#include <name_code.h>
+#include <stringops.h>
+#include <compat_va_copy.h>
+
+/* Global library. */
+
+#include <mail_params.h>
+#include <mail_proto.h>
+#include <rec_type.h>
+#include <record.h>
+#include <mime_state.h>
+#include <is_header.h>
+
+/* Postfix Milter library. */
+
+#include <milter.h>
+
+/* Application-specific. */
+
+ /*
+ * Use our own protocol definitions, so that Postfix can be built even when
+ * libmilter is not installed. This means that we must specify the libmilter
+ * protocol version in main.cf, and that we must send only the commands that
+ * are supported for that protocol version.
+ */
+
+ /*
+ * Commands from MTA to filter.
+ */
+#define SMFIC_ABORT 'A' /* Abort */
+#define SMFIC_BODY 'B' /* Body chunk */
+#define SMFIC_CONNECT 'C' /* Connection information */
+#define SMFIC_MACRO 'D' /* Define macro */
+#define SMFIC_BODYEOB 'E' /* final body chunk (End) */
+#define SMFIC_HELO 'H' /* HELO/EHLO */
+#define SMFIC_HEADER 'L' /* Header */
+#define SMFIC_MAIL 'M' /* MAIL from */
+#define SMFIC_EOH 'N' /* EOH */
+#define SMFIC_OPTNEG 'O' /* Option negotiation */
+#define SMFIC_QUIT 'Q' /* QUIT */
+#define SMFIC_RCPT 'R' /* RCPT to */
+#define SMFIC_DATA 'T' /* DATA */
+#define SMFIC_UNKNOWN 'U' /* Any unknown command */
+ /* Introduced with Sendmail 8.14. */
+#define SMFIC_QUIT_NC 'K' /* Quit + new connection */
+
+static const NAME_CODE smfic_table[] = {
+ "SMFIC_ABORT", SMFIC_ABORT,
+ "SMFIC_BODY", SMFIC_BODY,
+ "SMFIC_CONNECT", SMFIC_CONNECT,
+ "SMFIC_MACRO", SMFIC_MACRO,
+ "SMFIC_BODYEOB", SMFIC_BODYEOB,
+ "SMFIC_HELO", SMFIC_HELO,
+ "SMFIC_HEADER", SMFIC_HEADER,
+ "SMFIC_MAIL", SMFIC_MAIL,
+ "SMFIC_EOH", SMFIC_EOH,
+ "SMFIC_OPTNEG", SMFIC_OPTNEG,
+ "SMFIC_QUIT", SMFIC_QUIT,
+ "SMFIC_RCPT", SMFIC_RCPT,
+ "SMFIC_DATA", SMFIC_DATA,
+ "SMFIC_UNKNOWN", SMFIC_UNKNOWN,
+ /* Introduced with Sendmail 8.14. */
+ "SMFIC_QUIT_NC", SMFIC_QUIT_NC,
+ 0, 0,
+};
+
+ /*
+ * Responses from filter to MTA.
+ */
+#define SMFIR_ADDRCPT '+' /* add recipient */
+#define SMFIR_DELRCPT '-' /* remove recipient */
+#define SMFIR_ACCEPT 'a' /* accept */
+#define SMFIR_REPLBODY 'b' /* replace body (chunk) */
+#define SMFIR_CONTINUE 'c' /* continue */
+#define SMFIR_DISCARD 'd' /* discard */
+#define SMFIR_CONN_FAIL 'f' /* cause a connection failure */
+#define SMFIR_CHGHEADER 'm' /* change header */
+#define SMFIR_PROGRESS 'p' /* progress */
+#define SMFIR_REJECT 'r' /* reject */
+#define SMFIR_TEMPFAIL 't' /* tempfail */
+#define SMFIR_SHUTDOWN '4' /* 421: shutdown (internal to MTA) */
+#define SMFIR_ADDHEADER 'h' /* add header */
+#define SMFIR_INSHEADER 'i' /* insert header */
+#define SMFIR_REPLYCODE 'y' /* reply code etc */
+#define SMFIR_QUARANTINE 'q' /* quarantine */
+ /* Introduced with Sendmail 8.14. */
+#define SMFIR_SKIP 's' /* skip further events of this type */
+#define SMFIR_CHGFROM 'e' /* change sender (incl. ESMTP args) */
+#define SMFIR_ADDRCPT_PAR '2' /* add recipient (incl. ESMTP args) */
+#define SMFIR_SETSYMLIST 'l' /* set list of symbols (macros) */
+
+static const NAME_CODE smfir_table[] = {
+ "SMFIR_ADDRCPT", SMFIR_ADDRCPT,
+ "SMFIR_DELRCPT", SMFIR_DELRCPT,
+ "SMFIR_ACCEPT", SMFIR_ACCEPT,
+ "SMFIR_REPLBODY", SMFIR_REPLBODY,
+ "SMFIR_CONTINUE", SMFIR_CONTINUE,
+ "SMFIR_DISCARD", SMFIR_DISCARD,
+ "SMFIR_CONN_FAIL", SMFIR_CONN_FAIL,
+ "SMFIR_CHGHEADER", SMFIR_CHGHEADER,
+ "SMFIR_PROGRESS", SMFIR_PROGRESS,
+ "SMFIR_REJECT", SMFIR_REJECT,
+ "SMFIR_TEMPFAIL", SMFIR_TEMPFAIL,
+ "SMFIR_SHUTDOWN", SMFIR_SHUTDOWN,
+ "SMFIR_ADDHEADER", SMFIR_ADDHEADER,
+ "SMFIR_INSHEADER", SMFIR_INSHEADER,
+ "SMFIR_REPLYCODE", SMFIR_REPLYCODE,
+ "SMFIR_QUARANTINE", SMFIR_QUARANTINE,
+ /* Introduced with Sendmail 8.14. */
+ "SMFIR_SKIP", SMFIR_SKIP,
+ "SMFIR_CHGFROM", SMFIR_CHGFROM,
+ "SMFIR_ADDRCPT_PAR", SMFIR_ADDRCPT_PAR,
+ "SMFIR_SETSYMLIST", SMFIR_SETSYMLIST,
+ 0, 0,
+};
+
+ /*
+ * Commands that the filter does not want to receive, and replies that the
+ * filter will not send. Plus some other random stuff.
+ */
+#define SMFIP_NOCONNECT (1L<<0) /* filter does not want connect info */
+#define SMFIP_NOHELO (1L<<1) /* filter does not want HELO info */
+#define SMFIP_NOMAIL (1L<<2) /* filter does not want MAIL info */
+#define SMFIP_NORCPT (1L<<3) /* filter does not want RCPT info */
+#define SMFIP_NOBODY (1L<<4) /* filter does not want body */
+#define SMFIP_NOHDRS (1L<<5) /* filter does not want headers */
+#define SMFIP_NOEOH (1L<<6) /* filter does not want EOH */
+#define SMFIP_NR_HDR (1L<<7) /* filter won't reply for header */
+#define SMFIP_NOHREPL SMFIP_NR_HDR
+#define SMFIP_NOUNKNOWN (1L<<8) /* filter does not want unknown cmd */
+#define SMFIP_NODATA (1L<<9) /* filter does not want DATA */
+ /* Introduced with Sendmail 8.14. */
+#define SMFIP_SKIP (1L<<10)/* MTA supports SMFIR_SKIP */
+#define SMFIP_RCPT_REJ (1L<<11)/* filter wants rejected RCPTs */
+#define SMFIP_NR_CONN (1L<<12)/* filter won't reply for connect */
+#define SMFIP_NR_HELO (1L<<13)/* filter won't reply for HELO */
+#define SMFIP_NR_MAIL (1L<<14)/* filter won't reply for MAIL */
+#define SMFIP_NR_RCPT (1L<<15)/* filter won't reply for RCPT */
+#define SMFIP_NR_DATA (1L<<16)/* filter won't reply for DATA */
+#define SMFIP_NR_UNKN (1L<<17)/* filter won't reply for UNKNOWN */
+#define SMFIP_NR_EOH (1L<<18)/* filter won't reply for eoh */
+#define SMFIP_NR_BODY (1L<<19)/* filter won't reply for body chunk */
+#define SMFIP_HDR_LEADSPC (1L<<20)/* header value has leading space */
+
+#define SMFIP_NOSEND_MASK \
+ (SMFIP_NOCONNECT | SMFIP_NOHELO | SMFIP_NOMAIL | SMFIP_NORCPT \
+ | SMFIP_NOBODY | SMFIP_NOHDRS | SMFIP_NOEOH | SMFIP_NOUNKNOWN \
+ | SMFIP_NODATA)
+
+#define SMFIP_NOREPLY_MASK \
+ (SMFIP_NR_CONN | SMFIP_NR_HELO | SMFIP_NR_MAIL | SMFIP_NR_RCPT \
+ | SMFIP_NR_DATA | SMFIP_NR_UNKN | SMFIP_NR_HDR | SMFIP_NR_EOH | \
+ SMFIP_NR_BODY)
+
+static const NAME_MASK smfip_table[] = {
+ "SMFIP_NOCONNECT", SMFIP_NOCONNECT,
+ "SMFIP_NOHELO", SMFIP_NOHELO,
+ "SMFIP_NOMAIL", SMFIP_NOMAIL,
+ "SMFIP_NORCPT", SMFIP_NORCPT,
+ "SMFIP_NOBODY", SMFIP_NOBODY,
+ "SMFIP_NOHDRS", SMFIP_NOHDRS,
+ "SMFIP_NOEOH", SMFIP_NOEOH,
+ "SMFIP_NR_HDR", SMFIP_NR_HDR,
+ "SMFIP_NOUNKNOWN", SMFIP_NOUNKNOWN,
+ "SMFIP_NODATA", SMFIP_NODATA,
+ /* Introduced with Sendmail 8.14. */
+ "SMFIP_SKIP", SMFIP_SKIP,
+ "SMFIP_RCPT_REJ", SMFIP_RCPT_REJ,
+ "SMFIP_NR_CONN", SMFIP_NR_CONN,
+ "SMFIP_NR_HELO", SMFIP_NR_HELO,
+ "SMFIP_NR_MAIL", SMFIP_NR_MAIL,
+ "SMFIP_NR_RCPT", SMFIP_NR_RCPT,
+ "SMFIP_NR_DATA", SMFIP_NR_DATA,
+ "SMFIP_NR_UNKN", SMFIP_NR_UNKN,
+ "SMFIP_NR_EOH", SMFIP_NR_EOH,
+ "SMFIP_NR_BODY", SMFIP_NR_BODY,
+ "SMFIP_HDR_LEADSPC", SMFIP_HDR_LEADSPC,
+ 0, 0,
+};
+
+ /*
+ * Options that the filter may send at initial handshake time, and message
+ * modifications that the filter may request at the end of the message body.
+ */
+#define SMFIF_ADDHDRS (1L<<0) /* filter may add headers */
+#define SMFIF_CHGBODY (1L<<1) /* filter may replace body */
+#define SMFIF_ADDRCPT (1L<<2) /* filter may add recipients */
+#define SMFIF_DELRCPT (1L<<3) /* filter may delete recipients */
+#define SMFIF_CHGHDRS (1L<<4) /* filter may change/delete headers */
+#define SMFIF_QUARANTINE (1L<<5) /* filter may quarantine envelope */
+ /* Introduced with Sendmail 8.14. */
+#define SMFIF_CHGFROM (1L<<6) /* filter may replace sender */
+#define SMFIF_ADDRCPT_PAR (1L<<7) /* filter may add recipients + args */
+#define SMFIF_SETSYMLIST (1L<<8) /* filter may send macro names */
+
+static const NAME_MASK smfif_table[] = {
+ "SMFIF_ADDHDRS", SMFIF_ADDHDRS,
+ "SMFIF_CHGBODY", SMFIF_CHGBODY,
+ "SMFIF_ADDRCPT", SMFIF_ADDRCPT,
+ "SMFIF_DELRCPT", SMFIF_DELRCPT,
+ "SMFIF_CHGHDRS", SMFIF_CHGHDRS,
+ "SMFIF_QUARANTINE", SMFIF_QUARANTINE,
+ /* Introduced with Sendmail 8.14. */
+ "SMFIF_CHGFROM", SMFIF_CHGFROM,
+ "SMFIF_ADDRCPT_PAR", SMFIF_ADDRCPT_PAR,
+ "SMFIF_SETSYMLIST", SMFIF_SETSYMLIST,
+ 0, 0,
+};
+
+ /*
+ * Network protocol families, used when sending CONNECT information.
+ */
+#define SMFIA_UNKNOWN 'U' /* unknown */
+#define SMFIA_UNIX 'L' /* unix/local */
+#define SMFIA_INET '4' /* inet */
+#define SMFIA_INET6 '6' /* inet6 */
+
+ /*
+ * External macro class numbers, to identify the optional macro name lists
+ * that may be sent after the initial negotiation header.
+ */
+#define SMFIM_CONNECT 0 /* macros for connect */
+#define SMFIM_HELO 1 /* macros for HELO */
+#define SMFIM_ENVFROM 2 /* macros for MAIL */
+#define SMFIM_ENVRCPT 3 /* macros for RCPT */
+#define SMFIM_DATA 4 /* macros for DATA */
+#define SMFIM_EOM 5 /* macros for end-of-message */
+#define SMFIM_EOH 6 /* macros for end-of-header */
+
+static const NAME_CODE smfim_table[] = {
+ "SMFIM_CONNECT", SMFIM_CONNECT,
+ "SMFIM_HELO", SMFIM_HELO,
+ "SMFIM_ENVFROM", SMFIM_ENVFROM,
+ "SMFIM_ENVRCPT", SMFIM_ENVRCPT,
+ "SMFIM_DATA", SMFIM_DATA,
+ "SMFIM_EOM", SMFIM_EOM,
+ "SMFIM_EOH", SMFIM_EOH,
+ 0, 0,
+};
+
+ /*
+ * Mapping from external macro class numbers to our internal MILTER_MACROS
+ * structure members, without using a switch statement.
+ */
+static const size_t milter8_macro_offsets[] = {
+ offsetof(MILTER_MACROS, conn_macros), /* SMFIM_CONNECT */
+ offsetof(MILTER_MACROS, helo_macros), /* SMFIM_HELO */
+ offsetof(MILTER_MACROS, mail_macros), /* SMFIM_ENVFROM */
+ offsetof(MILTER_MACROS, rcpt_macros), /* SMFIM_ENVRCPT */
+ offsetof(MILTER_MACROS, data_macros), /* SMFIM_DATA */
+ offsetof(MILTER_MACROS, eod_macros),/* Note: SMFIM_EOM < SMFIM_EOH */
+ offsetof(MILTER_MACROS, eoh_macros),/* Note: SMFIM_EOH > SMFIM_EOM */
+};
+
+#define MILTER8_MACRO_PTR(__macros, __class) \
+ ((char **) (((char *) (__macros)) + milter8_macro_offsets[(__class)]))
+
+ /*
+ * How much buffer space is available for sending body content.
+ */
+#define MILTER_CHUNK_SIZE 65535 /* body chunk size */
+
+/*#define msg_verbose 2*/
+
+ /*
+ * Sendmail 8 mail filter client.
+ */
+typedef struct {
+ MILTER m; /* parent class */
+ int conn_timeout; /* connect timeout */
+ int cmd_timeout; /* per-command timeout */
+ int msg_timeout; /* content inspection timeout */
+ char *protocol; /* protocol version/extension */
+ char *def_action; /* action if unavailable */
+ int version; /* application protocol version */
+ int rq_mask; /* application requests (SMFIF_*) */
+ int ev_mask; /* application events (SMFIP_*) */
+ int np_mask; /* events outside my protocol version */
+ VSTRING *buf; /* I/O buffer */
+ VSTRING *body; /* I/O buffer */
+ VSTREAM *fp; /* stream or null (closed) */
+
+ /*
+ * Following fields must be reset after successful CONNECT, to avoid
+ * leakage from one use to another.
+ */
+ int state; /* MILTER8_STAT_mumble */
+ char *def_reply; /* error response or null */
+ int skip_event_type; /* skip operations of this type */
+} MILTER8;
+
+ /*
+ * XXX Sendmail 8 libmilter automatically closes the MTA-to-filter socket
+ * when it finds out that the SMTP client has disconnected. Because of this
+ * behavior, Postfix has to open a new MTA-to-filter socket each time an
+ * SMTP client connects.
+ */
+#define LIBMILTER_AUTO_DISCONNECT
+
+ /*
+ * Milter internal state. For the external representation we use SMTP
+ * replies (4XX X.Y.Z text, 5XX X.Y.Z text) and one-letter strings
+ * (H=quarantine, D=discard, S=shutdown).
+ */
+#define MILTER8_STAT_ERROR 1 /* error, must be non-zero */
+#define MILTER8_STAT_CLOSED 2 /* no connection */
+#define MILTER8_STAT_READY 3 /* wait for connect event */
+#define MILTER8_STAT_ENVELOPE 4 /* in envelope */
+#define MILTER8_STAT_MESSAGE 5 /* in message */
+#define MILTER8_STAT_ACCEPT_CON 6 /* accept all commands */
+#define MILTER8_STAT_ACCEPT_MSG 7 /* accept one message */
+#define MILTER8_STAT_REJECT_CON 8 /* reject all commands */
+
+ /*
+ * Protocol formatting requests. Note: the terms "long" and "short" refer to
+ * the data types manipulated by htonl(), htons() and friends. These types
+ * are network specific, not host platform specific.
+ */
+#define MILTER8_DATA_END 0 /* no more arguments */
+#define MILTER8_DATA_HLONG 1 /* host long */
+#define MILTER8_DATA_BUFFER 2 /* network-formatted buffer */
+#define MILTER8_DATA_STRING 3 /* null-terminated string */
+#define MILTER8_DATA_NSHORT 4 /* network short */
+#define MILTER8_DATA_ARGV 5 /* array of null-terminated strings */
+#define MILTER8_DATA_OCTET 6 /* byte */
+#define MILTER8_DATA_MORE 7 /* more arguments in next call */
+
+ /*
+ * We don't accept insane amounts of data.
+ */
+#define XXX_MAX_DATA (INT_MAX / 2)
+#define XXX_TIMEOUT 10
+
+ /*
+ * We implement the protocol up to and including version 6, and configure in
+ * main.cf what protocol version we will use. The version is the first data
+ * item in the SMFIC_OPTNEG packet.
+ *
+ * We must send only events that are defined for the specified protocol
+ * version. Libmilter may disconnect when we send unexpected events.
+ *
+ * The following events are supported in all our milter protocol versions.
+ */
+#define MILTER8_V2_PROTO_MASK \
+ (SMFIP_NOCONNECT | SMFIP_NOHELO | SMFIP_NOMAIL | SMFIP_NORCPT | \
+ SMFIP_NOBODY | SMFIP_NOHDRS | SMFIP_NOEOH)
+
+ /*
+ * Events supported by later versions.
+ */
+#define MILTER8_V3_PROTO_MASK (MILTER8_V2_PROTO_MASK | SMFIP_NOUNKNOWN)
+#define MILTER8_V4_PROTO_MASK (MILTER8_V3_PROTO_MASK | SMFIP_NODATA)
+#define MILTER8_V6_PROTO_MASK \
+ (MILTER8_V4_PROTO_MASK | SMFIP_SKIP | SMFIP_RCPT_REJ \
+ | SMFIP_NOREPLY_MASK | SMFIP_HDR_LEADSPC)
+
+ /*
+ * What events we can send to the milter application. The milter8_protocol
+ * parameter can specify a protocol version as well as protocol extensions
+ * such as "no_header_reply", a feature that speeds up the protocol by not
+ * sending a filter reply for every individual message header.
+ *
+ * This looks unclean because the user can specify multiple protocol versions,
+ * but that is taken care of by the table that follows this one.
+ *
+ * XXX Is this still needed? Sendmail 8.14 provides a proper way to negotiate
+ * what replies the mail filter will send.
+ *
+ * XXX Keep this table in reverse numerical order. This is needed by the code
+ * that implements compatibility with older Milter protocol versions.
+ */
+static const NAME_CODE milter8_event_masks[] = {
+ "6", MILTER8_V6_PROTO_MASK,
+ "4", MILTER8_V4_PROTO_MASK,
+ "3", MILTER8_V3_PROTO_MASK,
+ "2", MILTER8_V2_PROTO_MASK,
+ "no_header_reply", SMFIP_NOHREPL,
+ 0, -1,
+};
+
+ /*
+ * The following table lets us use the same milter8_protocol parameter
+ * setting to derive the protocol version number. In this case we ignore
+ * protocol extensions such as "no_header_reply", and require that exactly
+ * one version number is specified.
+ */
+static const NAME_CODE milter8_versions[] = {
+ "2", 2,
+ "3", 3,
+ "4", 4,
+ "6", 6,
+ "no_header_reply", 0,
+ 0, -1,
+};
+
+/* SLMs. */
+
+#define STR(x) vstring_str(x)
+#define LEN(x) VSTRING_LEN(x)
+
+/* milter8_def_reply - set persistent response */
+
+static const char *milter8_def_reply(MILTER8 *milter, const char *reply)
+{
+ if (milter->def_reply)
+ myfree(milter->def_reply);
+ milter->def_reply = reply ? mystrdup(reply) : 0;
+ return (milter->def_reply);
+}
+
+/* milter8_conf_error - local/remote configuration error */
+
+static int milter8_conf_error(MILTER8 *milter)
+{
+ const char *reply;
+
+ /*
+ * XXX When the cleanup server closes its end of the Milter socket while
+ * editing a queue file, the SMTP server is left out of sync with the
+ * Milter. Sending an ABORT to the Milters will not restore
+ * synchronization, because there may be any number of Milter replies
+ * already in flight. Workaround: poison the socket and force the SMTP
+ * server to abandon it.
+ */
+ if (milter->fp != 0) {
+ (void) shutdown(vstream_fileno(milter->fp), SHUT_RDWR);
+ (void) vstream_fclose(milter->fp);
+ milter->fp = 0;
+ }
+ if (strcasecmp(milter->def_action, "accept") == 0) {
+ reply = 0;
+ } else if (strcasecmp(milter->def_action, "quarantine") == 0) {
+ reply = "H";
+ } else {
+ reply = "451 4.3.5 Server configuration problem - try again later";
+ }
+ milter8_def_reply(milter, reply);
+ return (milter->state = MILTER8_STAT_ERROR);
+}
+
+/* milter8_comm_error - read/write/format communication error */
+
+static int milter8_comm_error(MILTER8 *milter)
+{
+ const char *reply;
+
+ /*
+ * XXX When the cleanup server closes its end of the Milter socket while
+ * editing a queue file, the SMTP server is left out of sync with the
+ * Milter. Sending an ABORT to the Milters will not restore
+ * synchronization, because there may be any number of Milter replies
+ * already in flight. Workaround: poison the socket and force the SMTP
+ * server to abandon it.
+ */
+ if (milter->fp != 0) {
+ (void) shutdown(vstream_fileno(milter->fp), SHUT_RDWR);
+ (void) vstream_fclose(milter->fp);
+ milter->fp = 0;
+ }
+ if (strcasecmp(milter->def_action, "accept") == 0) {
+ reply = 0;
+ } else if (strcasecmp(milter->def_action, "reject") == 0) {
+ reply = "550 5.5.0 Service unavailable";
+ } else if (strcasecmp(milter->def_action, "tempfail") == 0) {
+ reply = "451 4.7.1 Service unavailable - try again later";
+ } else if (strcasecmp(milter->def_action, "quarantine") == 0) {
+ reply = "H";
+ } else {
+ msg_warn("milter %s: unrecognized default action: %s",
+ milter->m.name, milter->def_action);
+ reply = "451 4.3.5 Server configuration problem - try again later";
+ }
+ milter8_def_reply(milter, reply);
+ return (milter->state = MILTER8_STAT_ERROR);
+}
+
+/* milter8_close_stream - close stream to milter application */
+
+static void milter8_close_stream(MILTER8 *milter)
+{
+ if (milter->fp != 0) {
+ (void) vstream_fclose(milter->fp);
+ milter->fp = 0;
+ }
+ milter->state = MILTER8_STAT_CLOSED;
+}
+
+/* milter8_read_resp - receive command code now, receive data later */
+
+static int milter8_read_resp(MILTER8 *milter, int event, unsigned char *command,
+ ssize_t *data_len)
+{
+ UINT32_TYPE len;
+ ssize_t pkt_len;
+ const char *smfic_name;
+ int cmd;
+
+ /*
+ * Receive the packet length.
+ */
+ if ((vstream_fread(milter->fp, (void *) &len, UINT32_SIZE))
+ != UINT32_SIZE) {
+ smfic_name = str_name_code(smfic_table, event);
+ msg_warn("milter %s: can't read %s reply packet header: %m",
+ milter->m.name, smfic_name != 0 ?
+ smfic_name : "(unknown MTA event)");
+ return (milter8_comm_error(milter));
+ } else if ((pkt_len = ntohl(len)) < 1) {
+ msg_warn("milter %s: bad packet length: %ld",
+ milter->m.name, (long) pkt_len);
+ return (milter8_comm_error(milter));
+ } else if (pkt_len > XXX_MAX_DATA) {
+ msg_warn("milter %s: unreasonable packet length: %ld > %ld",
+ milter->m.name, (long) pkt_len, (long) XXX_MAX_DATA);
+ return (milter8_comm_error(milter));
+ }
+
+ /*
+ * Receive the command code.
+ */
+ else if ((cmd = VSTREAM_GETC(milter->fp)) == VSTREAM_EOF) {
+ msg_warn("milter %s: EOF while reading command code: %m",
+ milter->m.name);
+ return (milter8_comm_error(milter));
+ }
+
+ /*
+ * All is well.
+ */
+ else {
+ *command = cmd;
+ *data_len = pkt_len - 1;
+ return (0);
+ }
+}
+
+static int milter8_read_data(MILTER8 *milter, ssize_t *data_len,...);
+
+/* vmilter8_read_data - read command data */
+
+static int vmilter8_read_data(MILTER8 *milter, ssize_t *data_len, va_list ap)
+{
+ const char *myname = "milter8_read_data";
+ int arg_type;
+ UINT32_TYPE net_long;
+ UINT32_TYPE *host_long_ptr;
+ VSTRING *buf;
+ int ch;
+
+ while ((arg_type = va_arg(ap, int)) > 0 && arg_type != MILTER8_DATA_MORE) {
+ switch (arg_type) {
+
+ /*
+ * Host order long.
+ */
+ case MILTER8_DATA_HLONG:
+ if (*data_len < UINT32_SIZE) {
+ msg_warn("milter %s: input packet too short for network long",
+ milter->m.name);
+ return (milter8_comm_error(milter));
+ }
+ host_long_ptr = va_arg(ap, UINT32_TYPE *);
+ if (vstream_fread(milter->fp, (void *) &net_long, UINT32_SIZE)
+ != UINT32_SIZE) {
+ msg_warn("milter %s: EOF while reading network long: %m",
+ milter->m.name);
+ return (milter8_comm_error(milter));
+ }
+ *data_len -= UINT32_SIZE;
+ *host_long_ptr = ntohl(net_long);
+ break;
+
+ /*
+ * Raw on-the-wire format, without explicit null terminator.
+ */
+ case MILTER8_DATA_BUFFER:
+ if (*data_len < 0) {
+ msg_warn("milter %s: no data in input packet", milter->m.name);
+ return (milter8_comm_error(milter));
+ }
+ buf = va_arg(ap, VSTRING *);
+ if (vstream_fread_buf(milter->fp, buf, *data_len)
+ != *data_len) {
+ msg_warn("milter %s: EOF while reading data: %m", milter->m.name);
+ return (milter8_comm_error(milter));
+ }
+ *data_len = 0;
+ break;
+
+ /*
+ * Pointer to null-terminated string.
+ */
+ case MILTER8_DATA_STRING:
+ if (*data_len < 1) {
+ msg_warn("milter %s: packet too short for string",
+ milter->m.name);
+ return (milter8_comm_error(milter));
+ }
+ buf = va_arg(ap, VSTRING *);
+ VSTRING_RESET(buf);
+ for (;;) {
+ if ((ch = VSTREAM_GETC(milter->fp)) == VSTREAM_EOF) {
+ msg_warn("%s: milter %s: EOF while reading string: %m",
+ myname, milter->m.name);
+ return (milter8_comm_error(milter));
+ }
+ *data_len -= 1;
+ if (ch == 0)
+ break;
+ VSTRING_ADDCH(buf, ch);
+ if (*data_len <= 0) {
+ msg_warn("%s: milter %s: missing string null termimator",
+ myname, milter->m.name);
+ return (milter8_comm_error(milter));
+ }
+ }
+ VSTRING_TERMINATE(buf);
+ break;
+
+ /*
+ * Error.
+ */
+ default:
+ msg_panic("%s: unknown argument type: %d", myname, arg_type);
+ }
+ }
+
+ /*
+ * Sanity checks. We may have excess data when the sender is confused. We
+ * may have a negative count when we're confused ourselves.
+ */
+ if (arg_type != MILTER8_DATA_MORE && *data_len > 0) {
+ msg_warn("%s: left-over data %ld bytes", myname, (long) *data_len);
+ return (milter8_comm_error(milter));
+ }
+ if (*data_len < 0)
+ msg_panic("%s: bad left-over data count %ld",
+ myname, (long) *data_len);
+ return (0);
+}
+
+/* milter8_read_data - read command data */
+
+static int milter8_read_data(MILTER8 *milter, ssize_t *data_len,...)
+{
+ va_list ap;
+ int ret;
+
+ va_start(ap, data_len);
+ ret = vmilter8_read_data(milter, data_len, ap);
+ va_end(ap);
+ return (ret);
+}
+
+/* vmilter8_size_data - compute command data length */
+
+static ssize_t vmilter8_size_data(va_list ap)
+{
+ const char *myname = "vmilter8_size_data";
+ ssize_t data_len;
+ int arg_type;
+ VSTRING *buf;
+ const char *str;
+ const char **cpp;
+
+ /*
+ * Compute data size.
+ */
+ for (data_len = 0; (arg_type = va_arg(ap, int)) > 0; /* void */ ) {
+ switch (arg_type) {
+
+ /*
+ * Host order long.
+ */
+ case MILTER8_DATA_HLONG:
+ (void) va_arg(ap, UINT32_TYPE);
+ data_len += UINT32_SIZE;
+ break;
+
+ /*
+ * Raw on-the-wire format.
+ */
+ case MILTER8_DATA_BUFFER:
+ buf = va_arg(ap, VSTRING *);
+ data_len += LEN(buf);
+ break;
+
+ /*
+ * Pointer to null-terminated string.
+ */
+ case MILTER8_DATA_STRING:
+ str = va_arg(ap, char *);
+ data_len += strlen(str) + 1;
+ break;
+
+ /*
+ * Array of pointers to null-terminated strings.
+ */
+ case MILTER8_DATA_ARGV:
+ for (cpp = va_arg(ap, const char **); *cpp; cpp++)
+ data_len += strlen(*cpp) + 1;
+ break;
+
+ /*
+ * Network order short, promoted to int.
+ */
+ case MILTER8_DATA_NSHORT:
+ (void) va_arg(ap, unsigned);
+ data_len += UINT16_SIZE;
+ break;
+
+ /*
+ * Octet, promoted to int.
+ */
+ case MILTER8_DATA_OCTET:
+ (void) va_arg(ap, unsigned);
+ data_len += 1;
+ break;
+
+ /*
+ * Error.
+ */
+ default:
+ msg_panic("%s: bad argument type: %d", myname, arg_type);
+ }
+ }
+ va_end(ap);
+ return (data_len);
+}
+
+/* vmilter8_write_cmd - write command to Sendmail 8 Milter */
+
+static int vmilter8_write_cmd(MILTER8 *milter, int command, ssize_t data_len,
+ va_list ap)
+{
+ const char *myname = "vmilter8_write_cmd";
+ int arg_type;
+ UINT32_TYPE pkt_len;
+ UINT32_TYPE host_long;
+ UINT32_TYPE net_long;
+ UINT16_TYPE net_short;
+ VSTRING *buf;
+ const char *str;
+ const char **cpp;
+ char ch;
+
+ /*
+ * Deliver the packet.
+ */
+ if ((pkt_len = 1 + data_len) < 1)
+ msg_panic("%s: bad packet length %d", myname, pkt_len);
+ pkt_len = htonl(pkt_len);
+ (void) vstream_fwrite(milter->fp, (void *) &pkt_len, UINT32_SIZE);
+ (void) VSTREAM_PUTC(command, milter->fp);
+ while ((arg_type = va_arg(ap, int)) > 0) {
+ switch (arg_type) {
+
+ /*
+ * Network long.
+ */
+ case MILTER8_DATA_HLONG:
+ host_long = va_arg(ap, UINT32_TYPE);
+ net_long = htonl(host_long);
+ (void) vstream_fwrite(milter->fp, (void *) &net_long, UINT32_SIZE);
+ break;
+
+ /*
+ * Raw on-the-wire format.
+ */
+ case MILTER8_DATA_BUFFER:
+ buf = va_arg(ap, VSTRING *);
+ (void) vstream_fwrite(milter->fp, STR(buf), LEN(buf));
+ break;
+
+ /*
+ * Pointer to null-terminated string.
+ */
+ case MILTER8_DATA_STRING:
+ str = va_arg(ap, char *);
+ (void) vstream_fwrite(milter->fp, str, strlen(str) + 1);
+ break;
+
+ /*
+ * Octet, promoted to int.
+ */
+ case MILTER8_DATA_OCTET:
+ ch = va_arg(ap, unsigned);
+ (void) vstream_fwrite(milter->fp, &ch, 1);
+ break;
+
+ /*
+ * Array of pointers to null-terminated strings.
+ */
+ case MILTER8_DATA_ARGV:
+ for (cpp = va_arg(ap, const char **); *cpp; cpp++)
+ (void) vstream_fwrite(milter->fp, *cpp, strlen(*cpp) + 1);
+ break;
+
+ /*
+ * Network order short, promoted to int.
+ */
+ case MILTER8_DATA_NSHORT:
+ net_short = va_arg(ap, unsigned);
+ (void) vstream_fwrite(milter->fp, (void *) &net_short, UINT16_SIZE);
+ break;
+
+ /*
+ * Error.
+ */
+ default:
+ msg_panic("%s: bad argument type: %d", myname, arg_type);
+ }
+
+ /*
+ * Report errors immediately.
+ */
+ if (vstream_ferror(milter->fp)) {
+ msg_warn("milter %s: error writing command: %m", milter->m.name);
+ milter8_comm_error(milter);
+ break;
+ }
+ }
+ va_end(ap);
+ return (milter->state == MILTER8_STAT_ERROR);
+}
+
+/* milter8_write_cmd - write command to Sendmail 8 Milter */
+
+static int milter8_write_cmd(MILTER8 *milter, int command,...)
+{
+ va_list ap;
+ va_list ap2;
+ ssize_t data_len;
+ int err;
+
+ /*
+ * Initialize argument lists.
+ */
+ va_start(ap, command);
+ VA_COPY(ap2, ap);
+
+ /*
+ * Size the command data.
+ */
+ data_len = vmilter8_size_data(ap);
+ va_end(ap);
+
+ /*
+ * Send the command and data.
+ */
+ err = vmilter8_write_cmd(milter, command, data_len, ap2);
+ va_end(ap2);
+
+ return (err);
+}
+
+/* milter8_event - report event and receive reply */
+
+static const char *milter8_event(MILTER8 *milter, int event,
+ int skip_event_flag,
+ int skip_reply,
+ ARGV *macros,...)
+{
+ const char *myname = "milter8_event";
+ va_list ap;
+ va_list ap2;
+ ssize_t data_len;
+ int err;
+ unsigned char cmd;
+ ssize_t data_size;
+ const char *smfic_name;
+ const char *smfir_name;
+ MILTERS *parent = milter->m.parent;
+ UINT32_TYPE index;
+ const char *edit_resp = 0;
+ const char *retval = 0;
+ VSTRING *body_line_buf = 0;
+ int done = 0;
+ int body_edit_lockout = 0;
+
+#define DONT_SKIP_REPLY 0
+
+ /*
+ * Sanity check.
+ */
+ if (milter->fp == 0 || milter->def_reply != 0) {
+ msg_warn("%s: attempt to send event %s to milter %s after error",
+ myname,
+ (smfic_name = str_name_code(smfic_table, event)) != 0 ?
+ smfic_name : "(unknown MTA event)", milter->m.name);
+ return (milter->def_reply);
+ }
+
+ /*
+ * Skip this event if it doesn't exist in the protocol that I announced.
+ */
+ if ((skip_event_flag & milter->np_mask) != 0) {
+ if (msg_verbose)
+ msg_info("skipping non-protocol event %s for milter %s",
+ (smfic_name = str_name_code(smfic_table, event)) != 0 ?
+ smfic_name : "(unknown MTA event)", milter->m.name);
+ return (milter->def_reply);
+ }
+
+ /*
+ * Skip further events of this type if the filter told us so.
+ */
+ if (milter->skip_event_type != 0) {
+ if (event == milter->skip_event_type) {
+ if (msg_verbose)
+ msg_info("skipping event %s after SMFIR_SKIP from milter %s",
+ (smfic_name = str_name_code(smfic_table, event)) != 0 ?
+ smfic_name : "(unknown MTA event)", milter->m.name);
+ return (milter->def_reply);
+ } else {
+ milter->skip_event_type = 0;
+ }
+ }
+
+ /*
+ * Send the macros for this event, even when we're not reporting the
+ * event itself. This does not introduce a performance problem because
+ * we're sending macros and event parameters in one VSTREAM transaction.
+ *
+ * XXX Is this still necessary?
+ */
+ if (msg_verbose) {
+ VSTRING *buf = vstring_alloc(100);
+
+ if (macros) {
+ if (macros->argc > 0) {
+ char **cpp;
+
+ for (cpp = macros->argv; *cpp && cpp[1]; cpp += 2)
+ vstring_sprintf_append(buf, " %s=%s", *cpp, cpp[1]);
+ }
+ }
+ msg_info("event: %s; macros:%s",
+ (smfic_name = str_name_code(smfic_table, event)) != 0 ?
+ smfic_name : "(unknown MTA event)", *STR(buf) ?
+ STR(buf) : " (none)");
+ vstring_free(buf);
+ }
+ if (macros) {
+ if (milter8_write_cmd(milter, SMFIC_MACRO,
+ MILTER8_DATA_OCTET, event,
+ MILTER8_DATA_ARGV, macros->argv,
+ MILTER8_DATA_END) != 0)
+ return (milter->def_reply);
+ }
+
+ /*
+ * Skip this event if the Milter told us not to send it.
+ */
+ if ((skip_event_flag & milter->ev_mask) != 0) {
+ if (msg_verbose)
+ msg_info("skipping event %s for milter %s",
+ (smfic_name = str_name_code(smfic_table, event)) != 0 ?
+ smfic_name : "(unknown MTA event)", milter->m.name);
+ return (milter->def_reply);
+ }
+
+ /*
+ * Initialize argument lists.
+ */
+ va_start(ap, macros);
+ VA_COPY(ap2, ap);
+
+ /*
+ * Compute the command data size. This is necessary because the protocol
+ * sends length before content.
+ */
+ data_len = vmilter8_size_data(ap);
+ va_end(ap);
+
+ /*
+ * Send the command and data.
+ */
+ err = vmilter8_write_cmd(milter, event, data_len, ap2);
+ va_end(ap2);
+
+ /*
+ * C99 requires that we finalize argument lists before returning.
+ */
+ if (err != 0)
+ return (milter->def_reply);
+
+ /*
+ * Special feature: don't wait for one reply per header. This allows us
+ * to send multiple headers in one VSTREAM transaction, and improves
+ * over-all performance.
+ */
+ if (skip_reply) {
+ if (msg_verbose)
+ msg_info("skipping reply for event %s from milter %s",
+ (smfic_name = str_name_code(smfic_table, event)) != 0 ?
+ smfic_name : "(unknown MTA event)", milter->m.name);
+ return (milter->def_reply);
+ }
+
+ /*
+ * Receive the reply or replies.
+ *
+ * Intercept all loop exits so that we can do post header/body edit
+ * processing.
+ *
+ * XXX Bound the loop iteration count.
+ *
+ * In the end-of-body stage, the Milter may reply with one or more queue
+ * file edit requests before it replies with its final decision: accept,
+ * reject, etc. After a local queue file edit error (file too big, media
+ * write error), do not close the Milter socket in the cleanup server.
+ * Instead skip all further Milter replies until the final decision. This
+ * way the Postfix SMTP server stays in sync with the Milter, and Postfix
+ * doesn't have to lose the ability to handle multiple deliveries within
+ * the same SMTP session. This requires that the Postfix SMTP server uses
+ * something other than CLEANUP_STAT_WRITE when it loses contact with the
+ * cleanup server.
+ */
+#define IN_CONNECT_EVENT(e) ((e) == SMFIC_CONNECT || (e) == SMFIC_HELO)
+
+ /*
+ * XXX Don't evaluate this macro's argument multiple times. Since we use
+ * "continue" the macro can't be enclosed in do .. while (0).
+ */
+#define MILTER8_EVENT_BREAK(s) { \
+ retval = (s); \
+ done = 1; \
+ continue; \
+ }
+
+ while (done == 0) {
+ char *cp;
+ char *rp;
+ char ch;
+ char *next;
+
+ if (milter8_read_resp(milter, event, &cmd, &data_size) != 0)
+ MILTER8_EVENT_BREAK(milter->def_reply);
+ if (msg_verbose)
+ msg_info("reply: %s data %ld bytes",
+ (smfir_name = str_name_code(smfir_table, cmd)) != 0 ?
+ smfir_name : "unknown", (long) data_size);
+
+ /*
+ * Handle unfinished message body replacement first.
+ *
+ * XXX When SMFIR_REPLBODY is followed by some different request, we
+ * assume that the body replacement operation is complete. The queue
+ * file editing implementation currently does not support sending
+ * part 1 of the body replacement text, doing some other queue file
+ * updates, and then sending part 2 of the body replacement text. To
+ * avoid loss of data, we log an error when SMFIR_REPLBODY requests
+ * are alternated with other requests.
+ */
+ if (body_line_buf != 0 && cmd != SMFIR_REPLBODY) {
+ /* In case the last body replacement line didn't end in CRLF. */
+ if (edit_resp == 0 && LEN(body_line_buf) > 0)
+ edit_resp = parent->repl_body(parent->chg_context,
+ MILTER_BODY_LINE,
+ REC_TYPE_NORM,
+ body_line_buf);
+ if (edit_resp == 0)
+ edit_resp = parent->repl_body(parent->chg_context,
+ MILTER_BODY_END,
+ /* unused*/ 0,
+ (VSTRING *) 0);
+ body_edit_lockout = 1;
+ vstring_free(body_line_buf);
+ body_line_buf = 0;
+ }
+ switch (cmd) {
+
+ /*
+ * Still working on it.
+ */
+ case SMFIR_PROGRESS:
+ if (data_size != 0)
+ break;
+ continue;
+
+ /*
+ * Decision: continue processing.
+ */
+ case SMFIR_CONTINUE:
+ if (data_size != 0)
+ break;
+ MILTER8_EVENT_BREAK(milter->def_reply);
+
+ /*
+ * Decision: accept this message, or accept all further commands
+ * in this SMTP connection. This decision is final (i.e. Sendmail
+ * 8 changes receiver state).
+ */
+ case SMFIR_ACCEPT:
+ if (data_size != 0)
+ break;
+ if (IN_CONNECT_EVENT(event)) {
+#ifdef LIBMILTER_AUTO_DISCONNECT
+ milter8_close_stream(milter);
+#endif
+ /* No more events for this SMTP connection. */
+ milter->state = MILTER8_STAT_ACCEPT_CON;
+ } else {
+ /* No more events for this message. */
+ milter->state = MILTER8_STAT_ACCEPT_MSG;
+ }
+ MILTER8_EVENT_BREAK(milter->def_reply);
+
+ /*
+ * Decision: accept and silently discard this message. According
+ * to the milter API documentation there will be no action when
+ * this is requested by a connection-level function. This
+ * decision is final (i.e. Sendmail 8 changes receiver state).
+ */
+ case SMFIR_DISCARD:
+ if (data_size != 0)
+ break;
+ if (IN_CONNECT_EVENT(event)) {
+ msg_warn("milter %s: DISCARD action is not allowed "
+ "for connect or helo", milter->m.name);
+ MILTER8_EVENT_BREAK(milter->def_reply);
+ } else {
+ /* No more events for this message. */
+ milter->state = MILTER8_STAT_ACCEPT_MSG;
+ MILTER8_EVENT_BREAK("D");
+ }
+
+ /*
+ * Decision: reject connection, message or recipient. This
+ * decision is final (i.e. Sendmail 8 changes receiver state).
+ */
+ case SMFIR_REJECT:
+ if (data_size != 0)
+ break;
+ if (IN_CONNECT_EVENT(event)) {
+#ifdef LIBMILTER_AUTO_DISCONNECT
+ milter8_close_stream(milter);
+#endif
+ milter->state = MILTER8_STAT_REJECT_CON;
+ MILTER8_EVENT_BREAK(milter8_def_reply(milter, "550 5.7.1 Command rejected"));
+ } else {
+ MILTER8_EVENT_BREAK("550 5.7.1 Command rejected");
+ }
+
+ /*
+ * Decision: tempfail. This decision is final (i.e. Sendmail 8
+ * changes receiver state).
+ */
+ case SMFIR_TEMPFAIL:
+ if (data_size != 0)
+ break;
+ if (IN_CONNECT_EVENT(event)) {
+#ifdef LIBMILTER_AUTO_DISCONNECT
+ milter8_close_stream(milter);
+#endif
+ milter->state = MILTER8_STAT_REJECT_CON;
+ MILTER8_EVENT_BREAK(milter8_def_reply(milter,
+ "451 4.7.1 Service unavailable - try again later"));
+ } else {
+ MILTER8_EVENT_BREAK("451 4.7.1 Service unavailable - try again later");
+ }
+
+ /*
+ * Decision: disconnect. This decision is final (i.e. Sendmail 8
+ * changes receiver state).
+ */
+ case SMFIR_SHUTDOWN:
+ if (data_size != 0)
+ break;
+#ifdef LIBMILTER_AUTO_DISCONNECT
+ milter8_close_stream(milter);
+#endif
+ milter->state = MILTER8_STAT_REJECT_CON;
+ MILTER8_EVENT_BREAK(milter8_def_reply(milter, "S"));
+
+ /*
+ * Decision: "ddd d.d+.d+ text". This decision is final (i.e.
+ * Sendmail 8 changes receiver state). Note: the reply may be in
+ * multi-line SMTP format.
+ *
+ * XXX Sendmail compatibility: sendmail 8 uses the reply as a format
+ * string; therefore any '%' characters in the reply are doubled.
+ * Postfix doesn't use replies as format strings; we replace '%%'
+ * by '%', and remove single (i.e. invalid) '%' characters.
+ */
+ case SMFIR_REPLYCODE:
+ if (milter8_read_data(milter, &data_size,
+ MILTER8_DATA_BUFFER, milter->buf,
+ MILTER8_DATA_END) != 0)
+ MILTER8_EVENT_BREAK(milter->def_reply);
+ /* XXX Enforce this for each line of a multi-line reply. */
+ if ((STR(milter->buf)[0] != '4' && STR(milter->buf)[0] != '5')
+ || !ISDIGIT(STR(milter->buf)[1])
+ || !ISDIGIT(STR(milter->buf)[2])
+ || (STR(milter->buf)[3] != ' ' && STR(milter->buf)[3] != '-')
+ || (ISDIGIT(STR(milter->buf)[4])
+ && (STR(milter->buf)[4] != STR(milter->buf)[0]))) {
+ msg_warn("milter %s: malformed reply: %s",
+ milter->m.name, STR(milter->buf));
+ milter8_conf_error(milter);
+ MILTER8_EVENT_BREAK(milter->def_reply);
+ }
+ if ((rp = cp = strchr(STR(milter->buf), '%')) != 0) {
+ for (;;) {
+ if ((ch = *cp++) == '%')
+ ch = *cp++;
+ *rp++ = ch;
+ if (ch == 0)
+ break;
+ }
+ }
+ if (var_soft_bounce) {
+ for (cp = STR(milter->buf); /* void */ ; cp = next) {
+ if (cp[0] == '5') {
+ cp[0] = '4';
+ if (cp[4] == '5')
+ cp[4] = '4';
+ }
+ if ((next = strstr(cp, "\r\n")) == 0)
+ break;
+ next += 2;
+ }
+ }
+ if (IN_CONNECT_EVENT(event)) {
+#ifdef LIBMILTER_AUTO_DISCONNECT
+ milter8_close_stream(milter);
+#endif
+ milter->state = MILTER8_STAT_REJECT_CON;
+ MILTER8_EVENT_BREAK(milter8_def_reply(milter, STR(milter->buf)));
+ } else {
+ MILTER8_EVENT_BREAK(STR(milter->buf));
+ }
+
+ /*
+ * Decision: quarantine. In Sendmail 8.13 this does not imply a
+ * transition in the receiver state (reply, reject, tempfail,
+ * accept, discard). We should not transition, either, otherwise
+ * we get out of sync.
+ */
+ case SMFIR_QUARANTINE:
+ /* XXX What to do with the "reason" text? */
+ if (milter8_read_data(milter, &data_size,
+ MILTER8_DATA_BUFFER, milter->buf,
+ MILTER8_DATA_END) != 0)
+ MILTER8_EVENT_BREAK(milter->def_reply);
+ milter8_def_reply(milter, "H");
+ continue;
+
+ /*
+ * Decision: skip further events of this type.
+ */
+ case SMFIR_SKIP:
+ if (data_size != 0)
+ break;
+ milter->skip_event_type = event;
+ MILTER8_EVENT_BREAK(milter->def_reply);
+
+ /*
+ * Modification request or error.
+ */
+ default:
+ if (event == SMFIC_BODYEOB) {
+ switch (cmd) {
+
+#define MILTER8_HDR_SPACE(m) (((m)->ev_mask & SMFIP_HDR_LEADSPC) ? "" : " ")
+
+ /*
+ * Modification request: replace, insert or delete
+ * header. Index 1 means the first instance.
+ */
+ case SMFIR_CHGHEADER:
+ if (milter8_read_data(milter, &data_size,
+ MILTER8_DATA_HLONG, &index,
+ MILTER8_DATA_STRING, milter->buf,
+ MILTER8_DATA_STRING, milter->body,
+ MILTER8_DATA_END) != 0)
+ MILTER8_EVENT_BREAK(milter->def_reply);
+ /* Skip to the next request after previous edit error. */
+ if (edit_resp)
+ continue;
+ /* XXX Sendmail 8 compatibility. */
+ if (index == 0)
+ index = 1;
+ if ((ssize_t) index < 1) {
+ msg_warn("milter %s: bad change header index: %ld",
+ milter->m.name, (long) index);
+ milter8_conf_error(milter);
+ MILTER8_EVENT_BREAK(milter->def_reply);
+ }
+ if (LEN(milter->buf) == 0) {
+ msg_warn("milter %s: null change header name",
+ milter->m.name);
+ milter8_conf_error(milter);
+ MILTER8_EVENT_BREAK(milter->def_reply);
+ }
+ if (STR(milter->body)[0])
+ edit_resp = parent->upd_header(parent->chg_context,
+ (ssize_t) index,
+ STR(milter->buf),
+ MILTER8_HDR_SPACE(milter),
+ STR(milter->body));
+ else
+ edit_resp = parent->del_header(parent->chg_context,
+ (ssize_t) index,
+ STR(milter->buf));
+ continue;
+
+ /*
+ * Modification request: append header.
+ */
+ case SMFIR_ADDHEADER:
+ if (milter8_read_data(milter, &data_size,
+ MILTER8_DATA_STRING, milter->buf,
+ MILTER8_DATA_STRING, milter->body,
+ MILTER8_DATA_END) != 0)
+ MILTER8_EVENT_BREAK(milter->def_reply);
+ /* Skip to the next request after previous edit error. */
+ if (edit_resp)
+ continue;
+ edit_resp = parent->add_header(parent->chg_context,
+ STR(milter->buf),
+ MILTER8_HDR_SPACE(milter),
+ STR(milter->body));
+ continue;
+
+ /*
+ * Modification request: insert header. With Sendmail 8,
+ * index 0 means the top-most header. We use 1-based
+ * indexing for consistency with header change
+ * operations.
+ */
+ case SMFIR_INSHEADER:
+ if (milter8_read_data(milter, &data_size,
+ MILTER8_DATA_HLONG, &index,
+ MILTER8_DATA_STRING, milter->buf,
+ MILTER8_DATA_STRING, milter->body,
+ MILTER8_DATA_END) != 0)
+ MILTER8_EVENT_BREAK(milter->def_reply);
+ /* Skip to the next request after previous edit error. */
+ if (edit_resp)
+ continue;
+ if ((ssize_t) index + 1 < 1) {
+ msg_warn("milter %s: bad insert header index: %ld",
+ milter->m.name, (long) index);
+ milter8_conf_error(milter);
+ MILTER8_EVENT_BREAK(milter->def_reply);
+ }
+ edit_resp = parent->ins_header(parent->chg_context,
+ (ssize_t) index + 1,
+ STR(milter->buf),
+ MILTER8_HDR_SPACE(milter),
+ STR(milter->body));
+ continue;
+
+ /*
+ * Modification request: replace sender, with optional
+ * ESMTP args.
+ */
+ case SMFIR_CHGFROM:
+ if (milter8_read_data(milter, &data_size,
+ MILTER8_DATA_STRING, milter->buf,
+ MILTER8_DATA_MORE) != 0)
+ MILTER8_EVENT_BREAK(milter->def_reply);
+ if (data_size > 0) {
+ if (milter8_read_data(milter, &data_size,
+ MILTER8_DATA_STRING, milter->body,
+ MILTER8_DATA_END) != 0)
+ MILTER8_EVENT_BREAK(milter->def_reply);
+ } else {
+ VSTRING_RESET(milter->body);
+ VSTRING_TERMINATE(milter->body);
+ }
+ /* Skip to the next request after previous edit error. */
+ if (edit_resp)
+ continue;
+ edit_resp = parent->chg_from(parent->chg_context,
+ STR(milter->buf),
+ STR(milter->body));
+ continue;
+
+ /*
+ * Modification request: append recipient.
+ */
+ case SMFIR_ADDRCPT:
+ if (milter8_read_data(milter, &data_size,
+ MILTER8_DATA_STRING, milter->buf,
+ MILTER8_DATA_END) != 0)
+ MILTER8_EVENT_BREAK(milter->def_reply);
+ /* Skip to the next request after previous edit error. */
+ if (edit_resp)
+ continue;
+ edit_resp = parent->add_rcpt(parent->chg_context,
+ STR(milter->buf));
+ continue;
+
+ /*
+ * Modification request: append recipient, with optional
+ * ESMTP args.
+ */
+ case SMFIR_ADDRCPT_PAR:
+ if (milter8_read_data(milter, &data_size,
+ MILTER8_DATA_STRING, milter->buf,
+ MILTER8_DATA_MORE) != 0)
+ MILTER8_EVENT_BREAK(milter->def_reply);
+ if (data_size > 0) {
+ if (milter8_read_data(milter, &data_size,
+ MILTER8_DATA_STRING, milter->body,
+ MILTER8_DATA_END) != 0)
+ MILTER8_EVENT_BREAK(milter->def_reply);
+ } else {
+ VSTRING_RESET(milter->body);
+ VSTRING_TERMINATE(milter->body);
+ }
+ /* Skip to the next request after previous edit error. */
+ if (edit_resp)
+ continue;
+ edit_resp = parent->add_rcpt_par(parent->chg_context,
+ STR(milter->buf),
+ STR(milter->body));
+ continue;
+
+ /*
+ * Modification request: delete (expansion of) recipient.
+ */
+ case SMFIR_DELRCPT:
+ if (milter8_read_data(milter, &data_size,
+ MILTER8_DATA_STRING, milter->buf,
+ MILTER8_DATA_END) != 0)
+ MILTER8_EVENT_BREAK(milter->def_reply);
+ /* Skip to the next request after previous edit error. */
+ if (edit_resp)
+ continue;
+ edit_resp = parent->del_rcpt(parent->chg_context,
+ STR(milter->buf));
+ continue;
+
+ /*
+ * Modification request: replace the message body, and
+ * update the message size.
+ */
+ case SMFIR_REPLBODY:
+ if (body_edit_lockout) {
+ msg_warn("milter %s: body replacement requests can't "
+ "currently be mixed with other requests",
+ milter->m.name);
+ milter8_conf_error(milter);
+ MILTER8_EVENT_BREAK(milter->def_reply);
+ }
+ if (milter8_read_data(milter, &data_size,
+ MILTER8_DATA_BUFFER, milter->body,
+ MILTER8_DATA_END) != 0)
+ MILTER8_EVENT_BREAK(milter->def_reply);
+ /* Skip to the next request after previous edit error. */
+ if (edit_resp)
+ continue;
+ /* Start body replacement. */
+ if (body_line_buf == 0) {
+ body_line_buf = vstring_alloc(var_line_limit);
+ edit_resp = parent->repl_body(parent->chg_context,
+ MILTER_BODY_START,
+ /* unused */ 0,
+ (VSTRING *) 0);
+ }
+ /* Extract lines from the on-the-wire CRLF format. */
+ for (cp = STR(milter->body); edit_resp == 0
+ && cp < vstring_end(milter->body); cp++) {
+ ch = *(unsigned char *) cp;
+ if (ch == '\n') {
+ if (LEN(body_line_buf) > 0
+ && vstring_end(body_line_buf)[-1] == '\r')
+ vstring_truncate(body_line_buf,
+ LEN(body_line_buf) - 1);
+ edit_resp = parent->repl_body(parent->chg_context,
+ MILTER_BODY_LINE,
+ REC_TYPE_NORM,
+ body_line_buf);
+ VSTRING_RESET(body_line_buf);
+ } else {
+ /* Preserves \r if not followed by \n. */
+ if (LEN(body_line_buf) == var_line_limit) {
+ edit_resp = parent->repl_body(parent->chg_context,
+ MILTER_BODY_LINE,
+ REC_TYPE_CONT,
+ body_line_buf);
+ VSTRING_RESET(body_line_buf);
+ }
+ VSTRING_ADDCH(body_line_buf, ch);
+ }
+ }
+ continue;
+ }
+ }
+ msg_warn("milter %s: unexpected filter response %s after event %s",
+ milter->m.name,
+ (smfir_name = str_name_code(smfir_table, cmd)) != 0 ?
+ smfir_name : "(unknown filter reply)",
+ (smfic_name = str_name_code(smfic_table, event)) != 0 ?
+ smfic_name : "(unknown MTA event)");
+ milter8_comm_error(milter);
+ MILTER8_EVENT_BREAK(milter->def_reply);
+ }
+
+ /*
+ * Get here when the reply was followed by data bytes that weren't
+ * supposed to be there.
+ */
+ msg_warn("milter %s: reply %s was followed by %ld data bytes",
+ milter->m.name, (smfir_name = str_name_code(smfir_table, cmd)) != 0 ?
+ smfir_name : "unknown", (long) data_len);
+ milter8_comm_error(milter);
+ MILTER8_EVENT_BREAK(milter->def_reply);
+ }
+
+ /*
+ * Clean up after aborted message body replacement.
+ */
+ if (body_line_buf)
+ vstring_free(body_line_buf);
+
+ /*
+ * XXX Some cleanup clients ask the cleanup server to bounce mail for
+ * them. In that case we must override a hard reject retval result after
+ * queue file update failure. This is not a big problem; the odds are
+ * small that a Milter application sends a hard reject after replacing
+ * the message body.
+ */
+ if (edit_resp && (retval == 0 || strchr("DS4", retval[0]) == 0))
+ retval = edit_resp;
+ return (retval);
+}
+
+/* milter8_connect - connect to filter */
+
+static void milter8_connect(MILTER8 *milter)
+{
+ const char *myname = "milter8_connect";
+ ssize_t data_len;
+ unsigned char cmd;
+ char *transport;
+ char *endpoint;
+ int (*connect_fn) (const char *, int, int);
+ int fd;
+ const UINT32_TYPE my_actions = (SMFIF_ADDHDRS | SMFIF_ADDRCPT
+ | SMFIF_DELRCPT | SMFIF_CHGHDRS
+ | SMFIF_CHGBODY
+ | SMFIF_QUARANTINE
+ | SMFIF_CHGFROM
+ | SMFIF_ADDRCPT_PAR
+ | SMFIF_SETSYMLIST
+ );
+ UINT32_TYPE my_version = 0;
+ UINT32_TYPE my_events = 0;
+ char *saved_version;
+ char *cp;
+ char *name;
+
+ /*
+ * Sanity check.
+ */
+ if (milter->fp != 0)
+ msg_panic("%s: milter %s: socket is not closed",
+ myname, milter->m.name);
+
+ /*
+ * For user friendliness reasons the milter_protocol configuration
+ * parameter can specify both the protocol version and protocol
+ * extensions (e.g., don't reply for each individual message header).
+ *
+ * The protocol version is sent as is to the milter application.
+ *
+ * The version and extensions determine what events we can send to the
+ * milter application.
+ *
+ * We don't announce support for events that aren't defined for my protocol
+ * version. Today's libmilter implementations don't seem to care, but we
+ * don't want to take the risk that a future version will be more picky.
+ */
+ cp = saved_version = mystrdup(milter->protocol);
+ while ((name = mystrtok(&cp, CHARS_COMMA_SP)) != 0) {
+ int mask;
+ int vers;
+
+ if ((mask = name_code(milter8_event_masks,
+ NAME_CODE_FLAG_NONE, name)) == -1
+ || (vers = name_code(milter8_versions,
+ NAME_CODE_FLAG_NONE, name)) == -1
+ || (vers != 0 && my_version != 0)) {
+ msg_warn("milter %s: bad protocol information: %s",
+ milter->m.name, name);
+ milter8_conf_error(milter);
+ return;
+ }
+ if (vers != 0)
+ my_version = vers;
+ my_events |= mask;
+ }
+ myfree(saved_version);
+ if (my_events == 0 || my_version == 0) {
+ msg_warn("milter %s: no protocol version information", milter->m.name);
+ milter8_conf_error(milter);
+ return;
+ }
+
+ /*
+ * Don't send events that aren't defined for my protocol version.
+ */
+ milter->np_mask = (SMFIP_NOSEND_MASK & ~my_events);
+ if (msg_verbose)
+ msg_info("%s: non-protocol events for protocol version %d: %s",
+ myname, my_version,
+ str_name_mask_opt(milter->buf, "non-protocol event mask",
+ smfip_table, milter->np_mask, NAME_MASK_NUMBER));
+
+ /*
+ * Parse the Milter application endpoint.
+ */
+#define FREE_TRANSPORT_AND_BAIL_OUT(milter, milter_error) do { \
+ myfree(transport); \
+ milter_error(milter); \
+ return; \
+ } while (0);
+
+ transport = mystrdup(milter->m.name);
+ if ((endpoint = split_at(transport, ':')) == 0
+ || *endpoint == 0 || *transport == 0) {
+ msg_warn("Milter service needs transport:endpoint instead of \"%s\"",
+ milter->m.name);
+ FREE_TRANSPORT_AND_BAIL_OUT(milter, milter8_conf_error);
+ }
+ if (msg_verbose)
+ msg_info("%s: transport=%s endpoint=%s", myname, transport, endpoint);
+ if (strcmp(transport, "inet") == 0) {
+ connect_fn = inet_connect;
+ } else if (strcmp(transport, "unix") == 0) {
+ connect_fn = unix_connect;
+ } else if (strcmp(transport, "local") == 0) {
+ connect_fn = LOCAL_CONNECT;
+ } else {
+ msg_warn("invalid transport name: %s in Milter service: %s",
+ transport, milter->m.name);
+ FREE_TRANSPORT_AND_BAIL_OUT(milter, milter8_conf_error);
+ }
+
+ /*
+ * Connect to the Milter application.
+ */
+ if ((fd = connect_fn(endpoint, BLOCKING, milter->conn_timeout)) < 0) {
+ msg_warn("connect to Milter service %s: %m", milter->m.name);
+ FREE_TRANSPORT_AND_BAIL_OUT(milter, milter8_comm_error);
+ }
+ myfree(transport);
+ milter->fp = vstream_fdopen(fd, O_RDWR);
+ vstream_control(milter->fp,
+ CA_VSTREAM_CTL_DOUBLE,
+ CA_VSTREAM_CTL_TIMEOUT(milter->cmd_timeout),
+ CA_VSTREAM_CTL_END);
+ /* Avoid poor performance when TCP MSS > VSTREAM_BUFSIZE. */
+ if (connect_fn == inet_connect)
+ vstream_tweak_tcp(milter->fp);
+
+ /*
+ * Open the negotiations by sending what actions the Milter may request
+ * and what events the Milter can receive.
+ */
+ if (msg_verbose) {
+ msg_info("%s: my_version=0x%lx", myname, (long) my_version);
+ msg_info("%s: my_actions=0x%lx %s", myname, (long) my_actions,
+ str_name_mask_opt(milter->buf, "request mask",
+ smfif_table, my_actions, NAME_MASK_NUMBER));
+ msg_info("%s: my_events=0x%lx %s", myname, (long) my_events,
+ str_name_mask_opt(milter->buf, "event mask",
+ smfip_table, my_events, NAME_MASK_NUMBER));
+ }
+ errno = 0;
+ if (milter8_write_cmd(milter, SMFIC_OPTNEG,
+ MILTER8_DATA_HLONG, my_version,
+ MILTER8_DATA_HLONG, my_actions,
+ MILTER8_DATA_HLONG, my_events,
+ MILTER8_DATA_END) != 0) {
+ msg_warn("milter %s: write error in initial handshake",
+ milter->m.name);
+ /* milter8_write_cmd() called milter8_comm_error() */
+ return;
+ }
+
+ /*
+ * Receive the filter's response and verify that we are compatible.
+ */
+ if (milter8_read_resp(milter, SMFIC_OPTNEG, &cmd, &data_len) != 0) {
+ msg_warn("milter %s: read error in initial handshake", milter->m.name);
+ /* milter8_read_resp() called milter8_comm_error() */
+ return;
+ }
+ if (cmd != SMFIC_OPTNEG) {
+ msg_warn("milter %s: unexpected reply \"%c\" in initial handshake",
+ milter->m.name, cmd);
+ (void) milter8_comm_error(milter);
+ return;
+ }
+ if (milter8_read_data(milter, &data_len,
+ MILTER8_DATA_HLONG, &milter->version,
+ MILTER8_DATA_HLONG, &milter->rq_mask,
+ MILTER8_DATA_HLONG, &milter->ev_mask,
+ MILTER8_DATA_MORE) != 0) {
+ msg_warn("milter %s: read error in initial handshake", milter->m.name);
+ /* milter8_read_data() called milter8_comm_error() */
+ return;
+ }
+ if (milter->version > my_version) {
+ msg_warn("milter %s: protocol version %d conflict"
+ " with MTA protocol version %d",
+ milter->m.name, milter->version, my_version);
+ (void) milter8_comm_error(milter);
+ return;
+ }
+ if ((milter->rq_mask & my_actions) != milter->rq_mask) {
+ msg_warn("milter %s: request mask 0x%x conflict"
+ " with MTA request mask 0x%lx",
+ milter->m.name, milter->rq_mask, (long) my_actions);
+ (void) milter8_comm_error(milter);
+ return;
+ }
+ if (milter->ev_mask & SMFIP_RCPT_REJ)
+ milter->m.flags |= MILTER_FLAG_WANT_RCPT_REJ;
+
+ /*
+ * Allow the remote application to run an older protocol version, but
+ * don't them send events that their protocol version doesn't support.
+ * Based on a suggestion by Kouhei Sutou.
+ *
+ * XXX When the Milter sends a protocol version that we don't have
+ * information for, use the information for the next-lower protocol
+ * version instead. This code assumes that the milter8_event_masks table
+ * is organized in reverse numerical order.
+ */
+ if (milter->version < my_version) {
+ const NAME_CODE *np;
+ int version;
+
+ for (np = milter8_event_masks; /* see below */ ; np++) {
+ if (np->name == 0) {
+ msg_warn("milter %s: unexpected protocol version %d",
+ milter->m.name, milter->version);
+ break;
+ }
+ if ((version = atoi(np->name)) > 0 && version <= milter->version) {
+ milter->np_mask |= (SMFIP_NOSEND_MASK & ~np->code);
+ if (msg_verbose)
+ msg_info("%s: non-protocol events for milter %s"
+ " protocol version %d: %s",
+ myname, milter->m.name, milter->version,
+ str_name_mask_opt(milter->buf,
+ "non-protocol event mask",
+ smfip_table, milter->np_mask,
+ NAME_MASK_NUMBER));
+ break;
+ }
+ }
+ }
+
+ /*
+ * Initial negotiations completed.
+ */
+ if (msg_verbose) {
+ if ((milter->ev_mask & my_events) != milter->ev_mask)
+ msg_info("milter %s: event mask 0x%x includes features not"
+ " offered in MTA event mask 0x%lx",
+ milter->m.name, milter->ev_mask, (long) my_events);
+ msg_info("%s: milter %s version %d",
+ myname, milter->m.name, milter->version);
+ msg_info("%s: events %s", myname,
+ str_name_mask_opt(milter->buf, "event mask",
+ smfip_table, milter->ev_mask, NAME_MASK_NUMBER));
+ msg_info("%s: requests %s", myname,
+ str_name_mask_opt(milter->buf, "request mask",
+ smfif_table, milter->rq_mask, NAME_MASK_NUMBER));
+ }
+ milter->state = MILTER8_STAT_READY;
+ milter8_def_reply(milter, 0);
+ milter->skip_event_type = 0;
+
+ /*
+ * Secondary negotiations: override lists of macro names.
+ */
+ if (data_len > 0) {
+ VSTRING *buf = vstring_alloc(100);
+ UINT32_TYPE mac_type;
+ const char *smfim_name;
+ char **mac_value_ptr;
+
+ milter->m.macros = milter_macros_alloc(MILTER_MACROS_ALLOC_EMPTY);
+
+ while (data_len > 0
+ && milter8_read_data(milter, &data_len,
+ MILTER8_DATA_HLONG, &mac_type,
+ MILTER8_DATA_STRING, buf,
+ MILTER8_DATA_MORE) == 0) {
+ smfim_name = str_name_code(smfim_table, mac_type);
+ if (smfim_name == 0) {
+ msg_warn("milter %s: ignoring unknown macro type %u",
+ milter->m.name, (unsigned) mac_type);
+ } else {
+ if (msg_verbose)
+ msg_info("override %s macro list with \"%s\"",
+ smfim_name, STR(buf));
+ mac_value_ptr = MILTER8_MACRO_PTR(milter->m.macros, mac_type);
+ myfree(*mac_value_ptr);
+ *mac_value_ptr = mystrdup(STR(buf));
+ }
+ }
+ /* milter8_read_data() calls milter8_comm_error() after error. */
+ vstring_free(buf);
+ /* At this point the filter state is either READY or ERROR. */
+ }
+}
+
+/* milter8_conn_event - report connect event to Sendmail 8 milter */
+
+static const char *milter8_conn_event(MILTER *m,
+ const char *client_name,
+ const char *client_addr,
+ const char *client_port,
+ unsigned addr_family,
+ ARGV *macros)
+{
+ const char *myname = "milter8_conn_event";
+ MILTER8 *milter = (MILTER8 *) m;
+ int port;
+ int skip_reply;
+ const char *sm_name;
+ char *ptr = 0;
+ const char *resp;
+
+ /*
+ * Need a global definition for "unknown" host name or address that is
+ * shared by smtpd, cleanup and libmilter.
+ */
+#define XXX_UNKNOWN "unknown"
+#define STR_EQ(x,y) (strcmp((x), (y)) == 0)
+#define STR_NE(x,y) (strcmp((x), (y)) != 0)
+
+ /*
+ * Report the event.
+ */
+ switch (milter->state) {
+ case MILTER8_STAT_ERROR:
+ if (msg_verbose)
+ msg_info("%s: skip milter %s", myname, milter->m.name);
+ return (milter->def_reply);
+ case MILTER8_STAT_READY:
+ if (msg_verbose)
+ msg_info("%s: milter %s: connect %s/%s",
+ myname, milter->m.name, client_name, client_addr);
+ if (client_port == 0) {
+ port = 0;
+ } else if (!alldig(client_port) || (port = atoi(client_port)) < 0
+ || port > 65535) {
+ msg_warn("milter %s: bad client port number %s",
+ milter->m.name, client_port);
+ port = 0;
+ }
+ milter->state = MILTER8_STAT_ENVELOPE;
+ skip_reply = ((milter->ev_mask & SMFIP_NR_CONN) != 0);
+ /* Transform unknown hostname from Postfix to Sendmail form. */
+ sm_name = (STR_NE(client_name, XXX_UNKNOWN) ? client_name :
+ STR_EQ(client_addr, XXX_UNKNOWN) ? client_name :
+ (ptr = concatenate("[", client_addr, "]", (char *) 0)));
+ switch (addr_family) {
+ case AF_INET:
+ resp = milter8_event(milter, SMFIC_CONNECT, SMFIP_NOCONNECT,
+ skip_reply, macros,
+ MILTER8_DATA_STRING, sm_name,
+ MILTER8_DATA_OCTET, SMFIA_INET,
+ MILTER8_DATA_NSHORT, htons(port),
+ MILTER8_DATA_STRING, client_addr,
+ MILTER8_DATA_END);
+ break;
+#ifdef HAS_IPV6
+ case AF_INET6:
+ resp = milter8_event(milter, SMFIC_CONNECT, SMFIP_NOCONNECT,
+ skip_reply, macros,
+ MILTER8_DATA_STRING, sm_name,
+ MILTER8_DATA_OCTET, SMFIA_INET6,
+ MILTER8_DATA_NSHORT, htons(port),
+ MILTER8_DATA_STRING, client_addr,
+ MILTER8_DATA_END);
+ break;
+#endif
+ case AF_UNIX:
+ resp = milter8_event(milter, SMFIC_CONNECT, SMFIP_NOCONNECT,
+ skip_reply, macros,
+ MILTER8_DATA_STRING, sm_name,
+ MILTER8_DATA_OCTET, SMFIA_UNIX,
+ MILTER8_DATA_NSHORT, htons(0),
+ MILTER8_DATA_STRING, client_addr,
+ MILTER8_DATA_END);
+ break;
+ default:
+ resp = milter8_event(milter, SMFIC_CONNECT, SMFIP_NOCONNECT,
+ skip_reply, macros,
+ MILTER8_DATA_STRING, sm_name,
+ MILTER8_DATA_OCTET, SMFIA_UNKNOWN,
+ MILTER8_DATA_END);
+ break;
+ }
+ if (ptr != 0)
+ myfree(ptr);
+ return (resp);
+ default:
+ msg_panic("%s: milter %s: bad state %d",
+ myname, milter->m.name, milter->state);
+ }
+}
+
+/* milter8_helo_event - report HELO/EHLO command to Sendmail 8 milter */
+
+static const char *milter8_helo_event(MILTER *m, const char *helo_name,
+ int unused_esmtp,
+ ARGV *macros)
+{
+ const char *myname = "milter8_helo_event";
+ MILTER8 *milter = (MILTER8 *) m;
+ int skip_reply;
+
+ /*
+ * Report the event.
+ */
+ switch (milter->state) {
+ case MILTER8_STAT_ERROR:
+ case MILTER8_STAT_ACCEPT_CON:
+ case MILTER8_STAT_REJECT_CON:
+ if (msg_verbose)
+ msg_info("%s: skip milter %s", myname, milter->m.name);
+ return (milter->def_reply);
+ case MILTER8_STAT_ENVELOPE:
+ case MILTER8_STAT_ACCEPT_MSG:
+ /* With HELO after MAIL, smtpd(8) calls milter8_abort() next. */
+ if (msg_verbose)
+ msg_info("%s: milter %s: helo %s",
+ myname, milter->m.name, helo_name);
+ skip_reply = ((milter->ev_mask & SMFIP_NR_HELO) != 0);
+ return (milter8_event(milter, SMFIC_HELO, SMFIP_NOHELO,
+ skip_reply, macros,
+ MILTER8_DATA_STRING, helo_name,
+ MILTER8_DATA_END));
+ default:
+ msg_panic("%s: milter %s: bad state %d",
+ myname, milter->m.name, milter->state);
+ }
+}
+
+/* milter8_mail_event - report MAIL command to Sendmail 8 milter */
+
+static const char *milter8_mail_event(MILTER *m, const char **argv,
+ ARGV *macros)
+{
+ const char *myname = "milter8_mail_event";
+ MILTER8 *milter = (MILTER8 *) m;
+ const char **cpp;
+ int skip_reply;
+
+ /*
+ * Report the event.
+ */
+ switch (milter->state) {
+ case MILTER8_STAT_ERROR:
+ case MILTER8_STAT_ACCEPT_CON:
+ case MILTER8_STAT_REJECT_CON:
+ if (msg_verbose)
+ msg_info("%s: skip milter %s", myname, milter->m.name);
+ return (milter->def_reply);
+ case MILTER8_STAT_ENVELOPE:
+ if (msg_verbose) {
+ VSTRING *buf = vstring_alloc(100);
+
+ for (cpp = argv; *cpp; cpp++)
+ vstring_sprintf_append(buf, " %s", *cpp);
+ msg_info("%s: milter %s: mail%s",
+ myname, milter->m.name, STR(buf));
+ vstring_free(buf);
+ }
+ skip_reply = ((milter->ev_mask & SMFIP_NR_MAIL) != 0);
+ return (milter8_event(milter, SMFIC_MAIL, SMFIP_NOMAIL,
+ skip_reply, macros,
+ MILTER8_DATA_ARGV, argv,
+ MILTER8_DATA_END));
+ default:
+ msg_panic("%s: milter %s: bad state %d",
+ myname, milter->m.name, milter->state);
+ }
+}
+
+/* milter8_rcpt_event - report RCPT command to Sendmail 8 milter */
+
+static const char *milter8_rcpt_event(MILTER *m, const char **argv,
+ ARGV *macros)
+{
+ const char *myname = "milter8_rcpt_event";
+ MILTER8 *milter = (MILTER8 *) m;
+ const char **cpp;
+ int skip_reply;
+
+ /*
+ * Report the event.
+ */
+ switch (milter->state) {
+ case MILTER8_STAT_ERROR:
+ case MILTER8_STAT_ACCEPT_CON:
+ case MILTER8_STAT_REJECT_CON:
+ case MILTER8_STAT_ACCEPT_MSG:
+ if (msg_verbose)
+ msg_info("%s: skip milter %s", myname, milter->m.name);
+ return (milter->def_reply);
+ case MILTER8_STAT_ENVELOPE:
+ if (msg_verbose) {
+ VSTRING *buf = vstring_alloc(100);
+
+ for (cpp = argv; *cpp; cpp++)
+ vstring_sprintf_append(buf, " %s", *cpp);
+ msg_info("%s: milter %s: rcpt%s",
+ myname, milter->m.name, STR(buf));
+ vstring_free(buf);
+ }
+ skip_reply = ((milter->ev_mask & SMFIP_NR_RCPT) != 0);
+ return (milter8_event(milter, SMFIC_RCPT, SMFIP_NORCPT,
+ skip_reply, macros,
+ MILTER8_DATA_ARGV, argv,
+ MILTER8_DATA_END));
+ default:
+ msg_panic("%s: milter %s: bad state %d",
+ myname, milter->m.name, milter->state);
+ }
+}
+
+/* milter8_data_event - report DATA command to Sendmail 8 milter */
+
+static const char *milter8_data_event(MILTER *m, ARGV *macros)
+{
+ const char *myname = "milter8_data_event";
+ MILTER8 *milter = (MILTER8 *) m;
+ int skip_reply;
+
+ /*
+ * Report the event.
+ */
+ switch (milter->state) {
+ case MILTER8_STAT_ERROR:
+ case MILTER8_STAT_ACCEPT_CON:
+ case MILTER8_STAT_REJECT_CON:
+ case MILTER8_STAT_ACCEPT_MSG:
+ if (msg_verbose)
+ msg_info("%s: skip milter %s", myname, milter->m.name);
+ return (milter->def_reply);
+ case MILTER8_STAT_ENVELOPE:
+ if (msg_verbose)
+ msg_info("%s: milter %s: data command", myname, milter->m.name);
+ skip_reply = ((milter->ev_mask & SMFIP_NR_DATA) != 0);
+ return (milter8_event(milter, SMFIC_DATA, SMFIP_NODATA,
+ skip_reply, macros,
+ MILTER8_DATA_END));
+ default:
+ msg_panic("%s: milter %s: bad state %d",
+ myname, milter->m.name, milter->state);
+ }
+}
+
+/* milter8_unknown_event - report unknown SMTP command to Sendmail 8 milter */
+
+static const char *milter8_unknown_event(MILTER *m, const char *command,
+ ARGV *macros)
+{
+ const char *myname = "milter8_unknown_event";
+ MILTER8 *milter = (MILTER8 *) m;
+ int skip_reply;
+
+ /*
+ * Report the event.
+ */
+ switch (milter->state) {
+ case MILTER8_STAT_ERROR:
+ case MILTER8_STAT_ACCEPT_CON:
+ case MILTER8_STAT_REJECT_CON:
+ case MILTER8_STAT_ACCEPT_MSG:
+ if (msg_verbose)
+ msg_info("%s: skip milter %s", myname, milter->m.name);
+ return (milter->def_reply);
+ case MILTER8_STAT_ENVELOPE:
+ if (msg_verbose)
+ msg_info("%s: milter %s: unknown command: %s",
+ myname, milter->m.name, command);
+ /* XXX Sendmail doesn't send macros (checked with 8.6.13). */
+ skip_reply = ((milter->ev_mask & SMFIP_NR_UNKN) != 0);
+ return (milter8_event(milter, SMFIC_UNKNOWN, SMFIP_NOUNKNOWN,
+ skip_reply, macros,
+ MILTER8_DATA_STRING, command,
+ MILTER8_DATA_END));
+ default:
+ msg_panic("%s: milter %s: bad state %d",
+ myname, milter->m.name, milter->state);
+ }
+}
+
+/* milter8_other_event - reply for other event */
+
+static const char *milter8_other_event(MILTER *m)
+{
+ const char *myname = "milter8_other_event";
+ MILTER8 *milter = (MILTER8 *) m;
+
+ /*
+ * Return the default reply.
+ */
+ if (msg_verbose)
+ msg_info("%s: milter %s", myname, milter->m.name);
+ return (milter->def_reply);
+}
+
+/* milter8_abort - cancel one milter's message receiving state */
+
+static void milter8_abort(MILTER *m)
+{
+ const char *myname = "milter8_abort";
+ MILTER8 *milter = (MILTER8 *) m;
+
+ /*
+ * XXX Sendmail 8 libmilter closes the MTA-to-filter socket when it finds
+ * out that the SMTP client has disconnected. Because of this, Postfix
+ * has to open a new MTA-to-filter socket for each SMTP client.
+ */
+ switch (milter->state) {
+ case MILTER8_STAT_CLOSED:
+ case MILTER8_STAT_READY:
+ return;
+ case MILTER8_STAT_ERROR:
+ case MILTER8_STAT_ACCEPT_CON:
+ case MILTER8_STAT_REJECT_CON:
+ if (msg_verbose)
+ msg_info("%s: skip milter %s", myname, milter->m.name);
+ break;
+ case MILTER8_STAT_ENVELOPE:
+ case MILTER8_STAT_MESSAGE:
+ case MILTER8_STAT_ACCEPT_MSG:
+ if (msg_verbose)
+ msg_info("%s: abort milter %s", myname, milter->m.name);
+ (void) milter8_write_cmd(milter, SMFIC_ABORT, MILTER8_DATA_END);
+ if (milter->state != MILTER8_STAT_ERROR)
+ milter->state = MILTER8_STAT_ENVELOPE;
+ break;
+ default:
+ msg_panic("%s: milter %s: bad state %d",
+ myname, milter->m.name, milter->state);
+ }
+}
+
+/* milter8_disc_event - report client disconnect event */
+
+static void milter8_disc_event(MILTER *m)
+{
+ const char *myname = "milter8_disc_event";
+ MILTER8 *milter = (MILTER8 *) m;
+
+ /*
+ * XXX Sendmail 8 libmilter closes the MTA-to-filter socket when it finds
+ * out that the SMTP client has disconnected. Because of this, Postfix
+ * has to open a new MTA-to-filter socket for each SMTP client.
+ */
+ switch (milter->state) {
+ case MILTER8_STAT_CLOSED:
+ case MILTER8_STAT_READY:
+ return;
+ case MILTER8_STAT_ERROR:
+#ifdef LIBMILTER_AUTO_DISCONNECT
+ case MILTER8_STAT_ACCEPT_CON:
+ case MILTER8_STAT_REJECT_CON:
+#endif
+ if (msg_verbose)
+ msg_info("%s: skip quit milter %s", myname, milter->m.name);
+ break;
+ case MILTER8_STAT_ENVELOPE:
+ case MILTER8_STAT_MESSAGE:
+#ifndef LIBMILTER_AUTO_DISCONNECT
+ case MILTER8_STAT_ACCEPT_CON:
+ case MILTER8_STAT_REJECT_CON:
+#endif
+ case MILTER8_STAT_ACCEPT_MSG:
+ if (msg_verbose)
+ msg_info("%s: quit milter %s", myname, milter->m.name);
+ (void) milter8_write_cmd(milter, SMFIC_QUIT, MILTER8_DATA_END);
+ break;
+ }
+#ifdef LIBMILTER_AUTO_DISCONNECT
+ milter8_close_stream(milter);
+#else
+ if (milter->state != MILTER8_STAT_ERROR)
+ milter->state = MILTER8_STAT_READY;
+#endif
+ milter8_def_reply(milter, 0);
+}
+
+ /*
+ * Structure to ship context across the MIME_STATE engine.
+ */
+typedef struct {
+ MILTER8 *milter; /* milter client */
+ ARGV *eoh_macros; /* end-of-header macros */
+ ARGV *eod_macros; /* end-of-body macros */
+ ARGV *auto_hdrs; /* auto-generated headers */
+ int auto_done; /* good enough for now */
+ int first_header; /* first header */
+ int first_body; /* first body line */
+ const char *resp; /* milter application response */
+} MILTER_MSG_CONTEXT;
+
+/* milter8_header - milter8_message call-back for message header */
+
+static void milter8_header(void *ptr, int unused_header_class,
+ const HEADER_OPTS *header_info,
+ VSTRING *buf, off_t unused_offset)
+{
+ const char *myname = "milter8_header";
+ MILTER_MSG_CONTEXT *msg_ctx = (MILTER_MSG_CONTEXT *) ptr;
+ MILTER8 *milter = msg_ctx->milter;
+ char *cp;
+ int skip_reply;
+ char **cpp;
+ unsigned done;
+
+ /*
+ * XXX Workaround: mime_state_update() may invoke multiple call-backs
+ * before returning to the caller.
+ */
+#define MILTER8_MESSAGE_DONE(milter, msg_ctx) \
+ ((milter)->state != MILTER8_STAT_MESSAGE || (msg_ctx)->resp != 0)
+
+ if (MILTER8_MESSAGE_DONE(milter, msg_ctx))
+ return;
+
+ /*
+ * XXX Sendmail compatibility. Don't expose our first (received) header
+ * to mail filter applications. See also cleanup_milter.c for code to
+ * ensure that header replace requests are relative to the message
+ * content as received, that is, without our own first (received) header,
+ * while header insert requests are relative to the message as delivered,
+ * that is, including our own first (received) header.
+ *
+ * XXX But this breaks when they delete our own Received: header with
+ * header_checks before it reaches the queue file. Even then we must not
+ * expose the first header to mail filter applications, otherwise the
+ * dk-filter signature will be inserted at the wrong position. It should
+ * precede the headers that it signs.
+ *
+ * XXX Sendmail compatibility. It eats the first space (not tab) after the
+ * header label and ":".
+ */
+ for (cpp = msg_ctx->auto_hdrs->argv, done = 1; *cpp; cpp++, done <<= 1)
+ if ((msg_ctx->auto_done & done) == 0 && strcmp(*cpp, STR(buf)) == 0) {
+ msg_ctx->auto_done |= done;
+ return;
+ }
+
+ /*
+ * Sendmail 8 sends multi-line headers as text separated by newline.
+ *
+ * We destroy the header buffer to split it into label and value. Changing
+ * the buffer is explicitly allowed by the mime_state(3) interface.
+ */
+ if (msg_verbose > 1)
+ msg_info("%s: header milter %s: %.100s",
+ myname, milter->m.name, STR(buf));
+ cp = STR(buf) + (header_info ? strlen(header_info->name) :
+ is_header(STR(buf)));
+ /* XXX Following matches is_header.c */
+ while (*cp == ' ' || *cp == '\t')
+ *cp++ = 0;
+ if (*cp != ':')
+ msg_panic("%s: header label not followed by ':'", myname);
+ *cp++ = 0;
+ /* XXX Sendmail by default eats one space (not tab) after the colon. */
+ if ((milter->ev_mask & SMFIP_HDR_LEADSPC) == 0 && *cp == ' ')
+ cp++;
+ skip_reply = ((milter->ev_mask & SMFIP_NOHREPL) != 0);
+ msg_ctx->resp =
+ milter8_event(milter, SMFIC_HEADER, SMFIP_NOHDRS,
+ skip_reply, msg_ctx->eoh_macros,
+ MILTER8_DATA_STRING, STR(buf),
+ MILTER8_DATA_STRING, cp,
+ MILTER8_DATA_END);
+}
+
+/* milter8_eoh - milter8_message call-back for end-of-header */
+
+static void milter8_eoh(void *ptr)
+{
+ const char *myname = "milter8_eoh";
+ MILTER_MSG_CONTEXT *msg_ctx = (MILTER_MSG_CONTEXT *) ptr;
+ MILTER8 *milter = msg_ctx->milter;
+ int skip_reply;
+
+ if (MILTER8_MESSAGE_DONE(milter, msg_ctx))
+ return;
+ if (msg_verbose)
+ msg_info("%s: eoh milter %s", myname, milter->m.name);
+ skip_reply = ((milter->ev_mask & SMFIP_NR_EOH) != 0);
+ msg_ctx->resp =
+ milter8_event(milter, SMFIC_EOH, SMFIP_NOEOH,
+ skip_reply, msg_ctx->eoh_macros,
+ MILTER8_DATA_END);
+}
+
+/* milter8_body - milter8_message call-back for body content */
+
+static void milter8_body(void *ptr, int rec_type,
+ const char *buf, ssize_t len,
+ off_t offset)
+{
+ const char *myname = "milter8_body";
+ MILTER_MSG_CONTEXT *msg_ctx = (MILTER_MSG_CONTEXT *) ptr;
+ MILTER8 *milter = msg_ctx->milter;
+ ssize_t todo = len;
+ const char *bp = buf;
+ ssize_t space;
+ ssize_t count;
+ int skip_reply;
+
+ if (MILTER8_MESSAGE_DONE(milter, msg_ctx))
+ return;
+
+ /*
+ * XXX Sendmail compatibility: don't expose our first body line.
+ */
+ if (msg_ctx->first_body) {
+ msg_ctx->first_body = 0;
+ return;
+ }
+
+ /*
+ * XXX I thought I was going to delegate all the on-the-wire formatting
+ * to a common lower layer, but unfortunately it's not practical. If we
+ * were to do MILTER_CHUNK_SIZE buffering in a common lower layer, then
+ * we would have to pass along call-backs and state, so that the
+ * call-back can invoke milter8_event() with the right arguments when the
+ * MILTER_CHUNK_SIZE buffer reaches capacity. That's just too ugly.
+ *
+ * To recover the cost of making an extra copy of body content from Milter
+ * buffer to VSTREAM buffer, we could make vstream_fwrite() a little
+ * smarter so that it does large transfers directly from the user buffer
+ * instead of copying the data one block at a time into a VSTREAM buffer.
+ */
+ if (msg_verbose > 1)
+ msg_info("%s: body milter %s: %.100s", myname, milter->m.name, buf);
+ skip_reply = ((milter->ev_mask & SMFIP_NR_BODY) != 0);
+ /* To append \r\n, simply redirect input to another buffer. */
+ if (rec_type == REC_TYPE_NORM && todo == 0) {
+ bp = "\r\n";
+ todo = 2;
+ rec_type = REC_TYPE_EOF;
+ }
+ while (todo > 0) {
+ /* Append one REC_TYPE_NORM or REC_TYPE_CONT to body chunk buffer. */
+ space = MILTER_CHUNK_SIZE - LEN(milter->body);
+ if (space <= 0)
+ msg_panic("%s: bad buffer size: %ld",
+ myname, (long) LEN(milter->body));
+ count = (todo > space ? space : todo);
+ vstring_memcat(milter->body, bp, count);
+ bp += count;
+ todo -= count;
+ /* Flush body chunk buffer when full. See also milter8_eob(). */
+ if (LEN(milter->body) == MILTER_CHUNK_SIZE) {
+ msg_ctx->resp =
+ milter8_event(milter, SMFIC_BODY, SMFIP_NOBODY,
+ skip_reply, msg_ctx->eod_macros,
+ MILTER8_DATA_BUFFER, milter->body,
+ MILTER8_DATA_END);
+ if (MILTER8_MESSAGE_DONE(milter, msg_ctx))
+ break;
+ VSTRING_RESET(milter->body);
+ }
+ /* To append \r\n, simply redirect input to another buffer. */
+ if (rec_type == REC_TYPE_NORM && todo == 0) {
+ bp = "\r\n";
+ todo = 2;
+ rec_type = REC_TYPE_EOF;
+ }
+ }
+}
+
+/* milter8_eob - milter8_message call-back for end-of-body */
+
+static void milter8_eob(void *ptr)
+{
+ const char *myname = "milter8_eob";
+ MILTER_MSG_CONTEXT *msg_ctx = (MILTER_MSG_CONTEXT *) ptr;
+ MILTER8 *milter = msg_ctx->milter;
+ int skip_reply;
+
+ if (MILTER8_MESSAGE_DONE(milter, msg_ctx))
+ return;
+ if (msg_verbose)
+ msg_info("%s: eob milter %s", myname, milter->m.name);
+
+ /*
+ * Flush partial body chunk buffer. See also milter8_body().
+ *
+ * XXX Sendmail 8 libmilter accepts SMFIC_EOB+data, and delivers it to the
+ * application as two events: SMFIC_BODY+data followed by SMFIC_EOB. This
+ * breaks with the PMilter 0.95 protocol re-implementation, which
+ * delivers the SMFIC_EOB event and ignores the data. To avoid such
+ * compatibility problems we separate the events in the client. With
+ * this, we also prepare for a future where different event types can
+ * have different macro lists.
+ */
+ if (LEN(milter->body) > 0) {
+ skip_reply = ((milter->ev_mask & SMFIP_NR_BODY) != 0);
+ msg_ctx->resp =
+ milter8_event(milter, SMFIC_BODY, SMFIP_NOBODY,
+ skip_reply, msg_ctx->eod_macros,
+ MILTER8_DATA_BUFFER, milter->body,
+ MILTER8_DATA_END);
+ if (MILTER8_MESSAGE_DONE(milter, msg_ctx))
+ return;
+ }
+ msg_ctx->resp =
+ milter8_event(msg_ctx->milter, SMFIC_BODYEOB, 0,
+ DONT_SKIP_REPLY, msg_ctx->eod_macros,
+ MILTER8_DATA_END);
+}
+
+/* milter8_message - send message content and receive reply */
+
+static const char *milter8_message(MILTER *m, VSTREAM *qfile,
+ off_t data_offset,
+ ARGV *eoh_macros,
+ ARGV *eod_macros,
+ ARGV *auto_hdrs)
+{
+ const char *myname = "milter8_message";
+ MILTER8 *milter = (MILTER8 *) m;
+ MIME_STATE *mime_state;
+ int rec_type;
+ const MIME_STATE_DETAIL *detail;
+ int mime_errs = 0;
+ MILTER_MSG_CONTEXT msg_ctx;
+ VSTRING *buf;
+ int saved_errno;
+
+ switch (milter->state) {
+ case MILTER8_STAT_ERROR:
+ case MILTER8_STAT_ACCEPT_CON:
+ case MILTER8_STAT_REJECT_CON:
+ case MILTER8_STAT_ACCEPT_MSG:
+ if (msg_verbose)
+ msg_info("%s: skip message to milter %s", myname, milter->m.name);
+ return (milter->def_reply);
+ case MILTER8_STAT_ENVELOPE:
+ if (msg_verbose)
+ msg_info("%s: message to milter %s", myname, milter->m.name);
+ if (vstream_fseek(qfile, data_offset, SEEK_SET) < 0) {
+ saved_errno = errno;
+ msg_warn("%s: vstream_fseek %s: %m", myname, VSTREAM_PATH(qfile));
+ /* XXX This should be available from cleanup_strerror.c. */
+ return (saved_errno == EFBIG ?
+ "552 5.3.4 Message file too big" :
+ "451 4.3.0 Queue file write error");
+ }
+ msg_ctx.milter = milter;
+ msg_ctx.eoh_macros = eoh_macros;
+ msg_ctx.eod_macros = eod_macros;
+ msg_ctx.auto_hdrs = auto_hdrs;
+ msg_ctx.auto_done = 0;
+ msg_ctx.first_header = 1;
+ msg_ctx.first_body = 1;
+ msg_ctx.resp = 0;
+ mime_state =
+ mime_state_alloc(MIME_OPT_DISABLE_MIME,
+ (milter->ev_mask & SMFIP_NOHDRS) ?
+ (MIME_STATE_HEAD_OUT) 0 : milter8_header,
+ (milter->ev_mask & SMFIP_NOEOH) ?
+ (MIME_STATE_ANY_END) 0 : milter8_eoh,
+ (milter->ev_mask & SMFIP_NOBODY) ?
+ (MIME_STATE_BODY_OUT) 0 : milter8_body,
+ milter8_eob,
+ (MIME_STATE_ERR_PRINT) 0,
+ (void *) &msg_ctx);
+ buf = vstring_alloc(100);
+ milter->state = MILTER8_STAT_MESSAGE;
+ VSTRING_RESET(milter->body);
+ vstream_control(milter->fp,
+ CA_VSTREAM_CTL_DOUBLE,
+ CA_VSTREAM_CTL_TIMEOUT(milter->msg_timeout),
+ CA_VSTREAM_CTL_END);
+
+ /*
+ * XXX When the message (not MIME body part) does not end in CRLF
+ * (i.e. the last record was REC_TYPE_CONT), do we send a CRLF
+ * terminator before triggering the end-of-body condition?
+ */
+ for (;;) {
+ if ((rec_type = rec_get(qfile, buf, 0)) < 0) {
+ msg_warn("%s: error reading %s: %m",
+ myname, VSTREAM_PATH(qfile));
+ msg_ctx.resp = "450 4.3.0 Queue file write error";
+ break;
+ }
+ /* Invoke the appropriate call-back routine. */
+ mime_errs = mime_state_update(mime_state, rec_type,
+ STR(buf), LEN(buf));
+ if (mime_errs) {
+ detail = mime_state_detail(mime_errs);
+ msg_warn("%s: MIME problem %s in %s",
+ myname, detail->text, VSTREAM_PATH(qfile));
+ msg_ctx.resp = "450 4.3.0 Queue file write error";
+ break;
+ }
+ if (MILTER8_MESSAGE_DONE(milter, &msg_ctx))
+ break;
+ if (rec_type != REC_TYPE_NORM && rec_type != REC_TYPE_CONT)
+ break;
+ }
+ mime_state_free(mime_state);
+ vstring_free(buf);
+ if (milter->fp)
+ vstream_control(milter->fp,
+ CA_VSTREAM_CTL_DOUBLE,
+ CA_VSTREAM_CTL_TIMEOUT(milter->cmd_timeout),
+ CA_VSTREAM_CTL_END);
+ if (milter->state == MILTER8_STAT_MESSAGE
+ || milter->state == MILTER8_STAT_ACCEPT_MSG)
+ milter->state = MILTER8_STAT_ENVELOPE;
+ return (msg_ctx.resp);
+ default:
+ msg_panic("%s: milter %s: bad state %d",
+ myname, milter->m.name, milter->state);
+ }
+}
+
+ /*
+ * Preliminary protocol to send/receive milter instances. This needs to be
+ * extended with type information once we support multiple milter protocols.
+ */
+#define MAIL_ATTR_MILT_NAME "milter_name"
+#define MAIL_ATTR_MILT_VERS "milter_version"
+#define MAIL_ATTR_MILT_ACTS "milter_actions"
+#define MAIL_ATTR_MILT_EVTS "milter_events"
+#define MAIL_ATTR_MILT_NPTS "milter_non_events"
+#define MAIL_ATTR_MILT_STAT "milter_state"
+#define MAIL_ATTR_MILT_CONN "milter_conn_timeout"
+#define MAIL_ATTR_MILT_CMD "milter_cmd_timeout"
+#define MAIL_ATTR_MILT_MSG "milter_msg_timeout"
+#define MAIL_ATTR_MILT_ACT "milter_action"
+#define MAIL_ATTR_MILT_MAC "milter_macro_list"
+
+/* milter8_active - report if this milter still wants events */
+
+static int milter8_active(MILTER *m)
+{
+ MILTER8 *milter = (MILTER8 *) m;
+
+ return (milter->fp != 0
+ && (milter->state == MILTER8_STAT_ENVELOPE
+ || milter->state == MILTER8_STAT_READY));
+}
+
+/* milter8_send - send milter instance */
+
+static int milter8_send(MILTER *m, VSTREAM *stream)
+{
+ const char *myname = "milter8_send";
+ MILTER8 *milter = (MILTER8 *) m;
+
+ if (msg_verbose)
+ msg_info("%s: milter %s", myname, milter->m.name);
+
+ /*
+ * The next read on this Milter socket happens in a different process. It
+ * will not automatically flush the output buffer in this process.
+ */
+ if (milter->fp)
+ vstream_fflush(milter->fp);
+
+ if (attr_print(stream, ATTR_FLAG_MORE,
+ SEND_ATTR_STR(MAIL_ATTR_MILT_NAME, milter->m.name),
+ SEND_ATTR_INT(MAIL_ATTR_MILT_VERS, milter->version),
+ SEND_ATTR_INT(MAIL_ATTR_MILT_ACTS, milter->rq_mask),
+ SEND_ATTR_INT(MAIL_ATTR_MILT_EVTS, milter->ev_mask),
+ SEND_ATTR_INT(MAIL_ATTR_MILT_NPTS, milter->np_mask),
+ SEND_ATTR_INT(MAIL_ATTR_MILT_STAT, milter->state),
+ SEND_ATTR_INT(MAIL_ATTR_MILT_CONN, milter->conn_timeout),
+ SEND_ATTR_INT(MAIL_ATTR_MILT_CMD, milter->cmd_timeout),
+ SEND_ATTR_INT(MAIL_ATTR_MILT_MSG, milter->msg_timeout),
+ SEND_ATTR_STR(MAIL_ATTR_MILT_ACT, milter->def_action),
+ SEND_ATTR_INT(MAIL_ATTR_MILT_MAC, milter->m.macros != 0),
+ ATTR_TYPE_END) != 0
+ || (milter->m.macros != 0
+ && attr_print(stream, ATTR_FLAG_NONE,
+ SEND_ATTR_FUNC(milter_macros_print,
+ (void *) milter->m.macros),
+ ATTR_TYPE_END) != 0)
+ || (milter->m.macros == 0
+ && attr_print(stream, ATTR_FLAG_NONE,
+ ATTR_TYPE_END) != 0)
+ || vstream_fflush(stream) != 0) {
+ return (-1);
+#ifdef CANT_WRITE_BEFORE_SENDING_FD
+ } else if (attr_scan(stream, ATTR_FLAG_STRICT,
+ RECV_ATTR_STR(MAIL_ATTR_DUMMY, milter->buf),
+ ATTR_TYPE_END) != 1) {
+ return (-1);
+#endif
+ } else if (LOCAL_SEND_FD(vstream_fileno(stream),
+ vstream_fileno(milter->fp)) < 0) {
+ return (-1);
+#ifdef MUST_READ_AFTER_SENDING_FD
+ } else if (attr_scan(stream, ATTR_FLAG_STRICT,
+ RECV_ATTR_STR(MAIL_ATTR_DUMMY, milter->buf),
+ ATTR_TYPE_END) != 1) {
+ return (-1);
+#endif
+ } else {
+ return (0);
+ }
+}
+
+static MILTER8 *milter8_alloc(const char *, int, int, int, const char *,
+ const char *, MILTERS *);
+
+/* milter8_receive - receive milter instance */
+
+MILTER *milter8_receive(VSTREAM *stream, MILTERS *parent)
+{
+ const char *myname = "milter8_receive";
+ static VSTRING *name_buf;
+ static VSTRING *act_buf;
+ MILTER8 *milter;
+ int version;
+ int rq_mask;
+ int ev_mask;
+ int np_mask;
+ int state;
+ int conn_timeout;
+ int cmd_timeout;
+ int msg_timeout;
+ int fd;
+ int has_macros;
+ MILTER_MACROS *macros = 0;
+
+#define FREE_MACROS_AND_RETURN(x) do { \
+ if (macros) \
+ milter_macros_free(macros); \
+ return (x); \
+ } while (0)
+
+ if (name_buf == 0) {
+ name_buf = vstring_alloc(10);
+ act_buf = vstring_alloc(10);
+ }
+ if (attr_scan(stream, ATTR_FLAG_STRICT | ATTR_FLAG_MORE,
+ RECV_ATTR_STR(MAIL_ATTR_MILT_NAME, name_buf),
+ RECV_ATTR_INT(MAIL_ATTR_MILT_VERS, &version),
+ RECV_ATTR_INT(MAIL_ATTR_MILT_ACTS, &rq_mask),
+ RECV_ATTR_INT(MAIL_ATTR_MILT_EVTS, &ev_mask),
+ RECV_ATTR_INT(MAIL_ATTR_MILT_NPTS, &np_mask),
+ RECV_ATTR_INT(MAIL_ATTR_MILT_STAT, &state),
+ RECV_ATTR_INT(MAIL_ATTR_MILT_CONN, &conn_timeout),
+ RECV_ATTR_INT(MAIL_ATTR_MILT_CMD, &cmd_timeout),
+ RECV_ATTR_INT(MAIL_ATTR_MILT_MSG, &msg_timeout),
+ RECV_ATTR_STR(MAIL_ATTR_MILT_ACT, act_buf),
+ RECV_ATTR_INT(MAIL_ATTR_MILT_MAC, &has_macros),
+ ATTR_TYPE_END) < 10
+ || (has_macros != 0
+ && attr_scan(stream, ATTR_FLAG_STRICT,
+ RECV_ATTR_FUNC(milter_macros_scan,
+ (void *) (macros =
+ milter_macros_alloc(MILTER_MACROS_ALLOC_ZERO))),
+ ATTR_TYPE_END) < 1)
+ || (has_macros == 0
+ && attr_scan(stream, ATTR_FLAG_STRICT,
+ ATTR_TYPE_END) < 0)) {
+ FREE_MACROS_AND_RETURN(0);
+#ifdef CANT_WRITE_BEFORE_SENDING_FD
+ } else if (attr_print(stream, ATTR_FLAG_NONE,
+ SEND_ATTR_STR(MAIL_ATTR_DUMMY, ""),
+ ATTR_TYPE_END) != 0
+ || vstream_fflush(stream) != 0) {
+ FREE_MACROS_AND_RETURN(0);
+#endif
+ } else if ((fd = LOCAL_RECV_FD(vstream_fileno(stream))) < 0) {
+ FREE_MACROS_AND_RETURN(0);
+ } else {
+#ifdef MUST_READ_AFTER_SENDING_FD
+ (void) attr_print(stream, ATTR_FLAG_NONE,
+ SEND_ATTR_STR(MAIL_ATTR_DUMMY, ""),
+ ATTR_TYPE_END);
+#endif
+#define NO_PROTOCOL ((char *) 0)
+
+ if (msg_verbose)
+ msg_info("%s: milter %s", myname, STR(name_buf));
+
+ milter = milter8_alloc(STR(name_buf), conn_timeout, cmd_timeout,
+ msg_timeout, NO_PROTOCOL, STR(act_buf), parent);
+ milter->fp = vstream_fdopen(fd, O_RDWR);
+ milter->m.macros = macros;
+ vstream_control(milter->fp, CA_VSTREAM_CTL_DOUBLE, CA_VSTREAM_CTL_END);
+ /* Avoid poor performance when TCP MSS > VSTREAM_BUFSIZE. */
+ vstream_tweak_sock(milter->fp);
+ milter->version = version;
+ milter->rq_mask = rq_mask;
+ milter->ev_mask = ev_mask;
+ milter->np_mask = np_mask;
+ milter->state = state;
+ return (&milter->m);
+ }
+}
+
+/* milter8_free - destroy Milter instance */
+
+static void milter8_free(MILTER *m)
+{
+ MILTER8 *milter = (MILTER8 *) m;
+
+ if (msg_verbose)
+ msg_info("free milter %s", milter->m.name);
+ if (milter->fp)
+ (void) vstream_fclose(milter->fp);
+ myfree(milter->m.name);
+ vstring_free(milter->buf);
+ vstring_free(milter->body);
+ if (milter->protocol)
+ myfree(milter->protocol);
+ myfree(milter->def_action);
+ if (milter->def_reply)
+ myfree(milter->def_reply);
+ if (milter->m.macros)
+ milter_macros_free(milter->m.macros);
+ myfree((void *) milter);
+}
+
+/* milter8_alloc - create MTA-side Sendmail 8 Milter instance */
+
+static MILTER8 *milter8_alloc(const char *name, int conn_timeout,
+ int cmd_timeout, int msg_timeout,
+ const char *protocol,
+ const char *def_action,
+ MILTERS *parent)
+{
+ MILTER8 *milter;
+
+ /*
+ * Fill in the structure. Note: all strings must be copied.
+ *
+ * XXX Sendmail 8 libmilter closes the MTA-to-filter socket when it finds
+ * out that the SMTP client has disconnected. Because of this, Postfix
+ * has to open a new MTA-to-filter socket for each SMTP client.
+ */
+ milter = (MILTER8 *) mymalloc(sizeof(*milter));
+ milter->m.name = mystrdup(name);
+ milter->m.flags = 0;
+ milter->m.next = 0;
+ milter->m.parent = parent;
+ milter->m.macros = 0;
+#ifdef LIBMILTER_AUTO_DISCONNECT
+ milter->m.connect_on_demand = (void (*) (struct MILTER *)) milter8_connect;
+#else
+ milter->m.connect_on_demand = 0;
+#endif
+ milter->m.conn_event = milter8_conn_event;
+ milter->m.helo_event = milter8_helo_event;
+ milter->m.mail_event = milter8_mail_event;
+ milter->m.rcpt_event = milter8_rcpt_event;
+ milter->m.data_event = milter8_data_event; /* may be null */
+ milter->m.message = milter8_message;
+ milter->m.unknown_event = milter8_unknown_event; /* may be null */
+ milter->m.other_event = milter8_other_event;
+ milter->m.abort = milter8_abort;
+ milter->m.disc_event = milter8_disc_event;
+ milter->m.active = milter8_active;
+ milter->m.send = milter8_send;
+ milter->m.free = milter8_free;
+ milter->fp = 0;
+ milter->buf = vstring_alloc(100);
+ milter->body = vstring_alloc(100);
+ milter->version = 0;
+ milter->rq_mask = 0;
+ milter->ev_mask = 0;
+ milter->state = MILTER8_STAT_CLOSED;
+ milter->conn_timeout = conn_timeout;
+ milter->cmd_timeout = cmd_timeout;
+ milter->msg_timeout = msg_timeout;
+ milter->protocol = (protocol ? mystrdup(protocol) : 0);
+ milter->def_action = mystrdup(def_action);
+ milter->def_reply = 0;
+ milter->skip_event_type = 0;
+
+ return (milter);
+}
+
+/* milter8_create - create MTA-side Sendmail 8 Milter instance */
+
+MILTER *milter8_create(const char *name, int conn_timeout, int cmd_timeout,
+ int msg_timeout, const char *protocol,
+ const char *def_action, MILTERS *parent)
+{
+ MILTER8 *milter;
+
+ /*
+ * Fill in the structure.
+ */
+ milter = milter8_alloc(name, conn_timeout, cmd_timeout, msg_timeout,
+ protocol, def_action, parent);
+
+ /*
+ * XXX Sendmail 8 libmilter closes the MTA-to-filter socket when it finds
+ * out that the SMTP client has disconnected. Because of this, Postfix
+ * has to open a new MTA-to-filter socket for each SMTP client.
+ */
+#ifndef LIBMILTER_AUTO_DISCONNECT
+ milter8_connect(milter);
+#endif
+ return (&milter->m);
+}