/* $NetBSD: smtp-sink.c,v 1.2 2017/02/14 01:16:48 christos Exp $ */
/*++
/* NAME
/* smtp-sink 1
/* SUMMARY
/* parallelized SMTP/LMTP test server
/* SYNOPSIS
/* .fi
/* \fBsmtp-sink\fR [\fIoptions\fR] [\fBinet:\fR][\fIhost\fR]:\fIport\fR
/* \fIbacklog\fR
/*
/* \fBsmtp-sink\fR [\fIoptions\fR] \fBunix:\fR\fIpathname\fR \fIbacklog\fR
/* DESCRIPTION
/* \fBsmtp-sink\fR listens on the named host (or address) and port.
/* It takes SMTP messages from the network and throws them away.
/* The purpose is to measure client performance, not protocol
/* compliance.
/*
/* \fBsmtp-sink\fR may also be configured to capture each mail
/* delivery transaction to file. Since disk latencies are large
/* compared to network delays, this mode of operation can
/* reduce the maximal performance by several orders of magnitude.
/*
/* Connections can be accepted on IPv4 or IPv6 endpoints, or on
/* UNIX-domain sockets.
/* IPv4 and IPv6 are the default.
/* This program is the complement of the \fBsmtp-source\fR(1) program.
/*
/* Note: this is an unsupported test program. No attempt is made
/* to maintain compatibility between successive versions.
/*
/* Arguments:
/* .IP \fB-4\fR
/* Support IPv4 only. This option has no effect when
/* Postfix is built without IPv6 support.
/* .IP \fB-6\fR
/* Support IPv6 only. This option is not available when
/* Postfix is built without IPv6 support.
/* .IP \fB-8\fR
/* Do not announce 8BITMIME support.
/* .IP \fB-a\fR
/* Do not announce SASL authentication support.
/* .IP "\fB-A \fIdelay\fR"
/* Wait \fIdelay\fR seconds after responding to DATA, then
/* abort prematurely with a 550 reply status. Do not read
/* further input from the client; this is an attempt to block
/* the client before it sends ".". Specify a zero delay value
/* to abort immediately.
/* .IP "\fB-b \fIsoft-bounce-reply\fR"
/* Use \fIsoft-bounce-reply\fR for soft reject responses. The
/* default reply is "450 4.3.0 Error: command failed".
/* .IP "\fB-B \fIhard-bounce-reply\fR"
/* Use \fIhard-bounce-reply\fR for hard reject responses. The
/* default reply is "500 5.3.0 Error: command failed".
/* .IP \fB-c\fR
/* Display running counters that are updated whenever an SMTP
/* session ends, a QUIT command is executed, or when "." is
/* received.
/* .IP \fB-C\fR
/* Disable XCLIENT support.
/* .IP "\fB-d \fIdump-template\fR"
/* Dump each mail transaction to a single-message file whose
/* name is created by expanding the \fIdump-template\fR via
/* strftime(3) and appending a pseudo-random hexadecimal number
/* (example: "%Y%m%d%H/%M." expands into "2006081203/05.809a62e3").
/* If the template contains "/" characters, missing directories
/* are created automatically. The message dump format is
/* described below.
/* .sp
/* Note: this option keeps one capture file open for every
/* mail transaction in progress.
/* .IP "\fB-D \fIdump-template\fR"
/* Append mail transactions to a multi-message dump file whose
/* name is created by expanding the \fIdump-template\fR via
/* strftime(3).
/* If the template contains "/" characters, missing directories
/* are created automatically. The message dump format is
/* described below.
/* .sp
/* Note: this option keeps one capture file open for every
/* mail transaction in progress.
/* .IP \fB-e\fR
/* Do not announce ESMTP support.
/* .IP \fB-E\fR
/* Do not announce ENHANCEDSTATUSCODES support.
/* .IP "\fB-f \fIcommand,command,...\fR"
/* Reject the specified commands with a hard (5xx) error code.
/* This option implies \fB-p\fR.
/* .sp
/* Examples of commands are CONNECT, HELO, EHLO, LHLO, MAIL, RCPT, VRFY,
/* DATA, ., RSET, NOOP, and QUIT. Separate command names by
/* white space or commas, and use quotes to protect white space
/* from the shell. Command names are case-insensitive.
/* .IP \fB-F\fR
/* Disable XFORWARD support.
/* .IP "\fB-h\fI hostname\fR"
/* Use \fIhostname\fR in the SMTP greeting, in the HELO response,
/* and in the EHLO response. The default hostname is "smtp-sink".
/* .IP "\fB-H\fI delay\fR"
/* Delay the first read operation after receiving DATA (time
/* in seconds). Combine with a large test message and a small
/* TCP window size (see the \fB-T\fR option) to test the Postfix
/* client write_wait() implementation.
/* .IP \fB-L\fR
/* Enable LMTP instead of SMTP.
/* .IP "\fB-m \fIcount\fR (default: 256)"
/* An upper bound on the maximal number of simultaneous
/* connections that \fBsmtp-sink\fR will handle. This prevents
/* the process from running out of file descriptors. Excess
/* connections will stay queued in the TCP/IP stack.
/* .IP "\fB-M \fIcount\fR"
/* Terminate after receiving \fIcount\fR messages.
/* .IP "\fB-n \fIcount\fR"
/* Terminate after \fIcount\fR sessions.
/* .IP \fB-N\fR
/* Do not announce support for DSN.
/* .IP \fB-p\fR
/* Do not announce support for ESMTP command pipelining.
/* .IP \fB-P\fR
/* Change the server greeting so that it appears to come through
/* a CISCO PIX system. Implies \fB-e\fR.
/* .IP "\fB-q \fIcommand,command,...\fR"
/* Disconnect (without replying) after receiving one of the
/* specified commands.
/* .sp
/* Examples of commands are CONNECT, HELO, EHLO, LHLO, MAIL, RCPT, VRFY,
/* DATA, ., RSET, NOOP, and QUIT. Separate command names by
/* white space or commas, and use quotes to protect white space
/* from the shell. Command names are case-insensitive.
/* .IP "\fB-Q \fIcommand,command,...\fR"
/* Send a 421 reply and disconnect after receiving one
/* of the specified commands.
/* .sp
/* Examples of commands are CONNECT, HELO, EHLO, LHLO, MAIL, RCPT, VRFY,
/* DATA, ., RSET, NOOP, and QUIT. Separate command names by
/* white space or commas, and use quotes to protect white space
/* from the shell. Command names are case-insensitive.
/* .IP "\fB-r \fIcommand,command,...\fR"
/* Reject the specified commands with a soft (4xx) error code.
/* This option implies \fB-p\fR.
/* .sp
/* Examples of commands are CONNECT, HELO, EHLO, LHLO, MAIL, RCPT, VRFY,
/* DATA, ., RSET, NOOP, and QUIT. Separate command names by
/* white space or commas, and use quotes to protect white space
/* from the shell. Command names are case-insensitive.
/* .IP "\fB-R \fIroot-directory\fR"
/* Change the process root directory to the specified location.
/* This option requires super-user privileges. See also the
/* \fB-u\fR option.
/* .IP "\fB-s \fIcommand,command,...\fR"
/* Log the named commands to syslogd.
/* .sp
/* Examples of commands are CONNECT, HELO, EHLO, LHLO, MAIL, RCPT, VRFY,
/* DATA, ., RSET, NOOP, and QUIT. Separate command names by
/* white space or commas, and use quotes to protect white space
/* from the shell. Command names are case-insensitive.
/* .IP "\fB-S start-string\fR"
/* An optional string that is prepended to each message that is
/* written to a dump file (see the dump file format description
/* below). The following C escape sequences are supported: \ea
/* (bell), \eb (backspace), \ef (formfeed), \en (newline), \er
/* (carriage return), \et (horizontal tab), \ev (vertical tab),
/* \e\fIddd\fR (up to three octal digits) and \e\e (the backslash
/* character).
/* .IP "\fB-t \fItimeout\fR (default: 100)"
/* Limit the time for receiving a command or sending a response.
/* The time limit is specified in seconds.
/* .IP "\fB-T \fIwindowsize\fR"
/* Override the default TCP window size. To work around
/* broken TCP window scaling implementations, specify a
/* value > 0 and < 65536.
/* .IP "\fB-u \fIusername\fR"
/* Switch to the specified user privileges after opening the
/* network socket and optionally changing the process root
/* directory. This option is required when the process runs
/* with super-user privileges. See also the \fB-R\fR option.
/* .IP \fB-v\fR
/* Show the SMTP conversations.
/* .IP "\fB-w \fIdelay\fR"
/* Wait \fIdelay\fR seconds before responding to a DATA command.
/* .IP "\fB-W \fIcommand:delay[:odds]\fR"
/* Wait \fIdelay\fR seconds before responding to \fIcommand\fR.
/* If \fIodds\fR is also specified (a number between 1-99
/* inclusive), wait for a random multiple of \fIdelay\fR. The
/* random multiplier is equal to the number of times the program
/* needs to roll a dice with a range of 0..99 inclusive, before
/* the dice produces a result greater than or equal to \fIodds\fR.
/* .IP [\fBinet:\fR][\fIhost\fR]:\fIport\fR
/* Listen on network interface \fIhost\fR (default: any interface)
/* TCP port \fIport\fR. Both \fIhost\fR and \fIport\fR may be
/* specified in numeric or symbolic form.
/* .IP \fBunix:\fR\fIpathname\fR
/* Listen on the UNIX-domain socket at \fIpathname\fR.
/* .IP \fIbacklog\fR
/* The maximum length the queue of pending connections,
/* as defined by the \fBlisten\fR(2) system call.
/* DUMP FILE FORMAT
/* .ad
/* .fi
/* Each dumped message contains a sequence of text lines,
/* terminated with the newline character. The sequence of
/* information is as follows:
/* .IP \(bu
/* The optional string specified with the \fB-S\fR option.
/* .IP \(bu
/* The \fBsmtp-sink\fR generated headers as documented below.
/* .IP \(bu
/* The message header and body as received from the SMTP client.
/* .IP \(bu
/* An empty line.
/* .PP
/* The format of the \fBsmtp-sink\fR generated headers is as
/* follows:
/* .IP "\fBX-Client-Addr: \fItext\fR"
/* The client IP address without enclosing []. An IPv6 address
/* is prefixed with "ipv6:". This record is always present.
/* .IP "\fBX-Client-Proto: \fItext\fR"
/* The client protocol: SMTP, ESMTP or LMTP. This record is
/* always present.
/* .IP "\fBX-Helo-Args: \fItext\fR"
/* The arguments of the last HELO or EHLO command before this
/* mail delivery transaction. This record is present only if
/* the client sent a recognizable HELO or EHLO command before
/* the DATA command.
/* .IP "\fBX-Mail-Args: \fItext\fR"
/* The arguments of the MAIL command that started this mail
/* delivery transaction. This record is present exactly once.
/* .IP "\fBX-Rcpt-Args: \fItext\fR"
/* The arguments of an RCPT command within this mail delivery
/* transaction. There is one record for each RCPT command, and
/* they are in the order as sent by the client.
/* .IP "\fBReceived: \fItext\fR"
/* A message header for compatibility with mail processing
/* software. This three-line header marks the end of the headers
/* provided by \fBsmtp-sink\fR, and is formatted as follows:
/* .RS
/* .IP "\fBfrom \fIhelo\fR ([\fIaddr\fR])"
/* The HELO or EHLO command argument and client IP address.
/* If the client did not send HELO or EHLO, the client IP
/* address is used instead.
/* .IP "\fBby \fIhost\fB (smtp-sink) with \fIproto\fB id \fIrandom\fB;\fR"
/* The hostname specified with the \fB-h\fR option, the client
/* protocol (see \fBX-Client-Proto\fR above), and the pseudo-random
/* portion of the per-message capture file name.
/* .IP \fItime-stamp\fR
/* A time stamp as defined in RFC 2822.
/* .RE
/* SEE ALSO
/* smtp-source(1), SMTP/LMTP message generator
/* 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 <sys/wait.h>
#include <sys/stat.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <fcntl.h>
#include <syslog.h>
#include <signal.h>
#include <time.h>
#include <ctype.h>
#ifdef STRCASECMP_IN_STRINGS_H
#include <strings.h>
#endif
/* Utility library. */
#include <msg.h>
#include <vstring.h>
#include <vstream.h>
#include <vstring_vstream.h>
#include <get_hostname.h>
#include <listen.h>
#include <events.h>
#include <mymalloc.h>
#include <iostuff.h>
#include <msg_vstream.h>
#include <stringops.h>
#include <sane_accept.h>
#include <inet_proto.h>
#include <myaddrinfo.h>
#include <make_dirs.h>
#include <myrand.h>
#include <chroot_uid.h>
/* Global library. */
#include <smtp_stream.h>
#include <mail_date.h>
#include <mail_version.h>
/* Application-specific. */
typedef struct SINK_STATE {
VSTREAM *stream;
VSTRING *buffer;
int data_state;
int (*read_fn) (struct SINK_STATE *);
int in_mail;
int rcpts;
char *push_back_ptr;
/* Capture file information for fake Received: header */
MAI_HOSTADDR_STR client_addr; /* IP address */
char *addr_prefix; /* ipv6: or empty */
char *helo_args; /* text after HELO or EHLO */
const char *client_proto; /* SMTP, ESMTP, LMTP */
time_t start_time; /* MAIL command time */
int id; /* pseudo-random */
VSTREAM *dump_file; /* dump file or null */
void (*delayed_response) (struct SINK_STATE *state, const char *);
char *delayed_args;
} SINK_STATE;
#define ST_ANY 0
#define ST_CR 1
#define ST_CR_LF 2
#define ST_CR_LF_DOT 3
#define ST_CR_LF_DOT_CR 4
#define ST_CR_LF_DOT_CR_LF 5
#define PUSH_BACK_PEEK(state) (*(state)->push_back_ptr != 0)
#define PUSH_BACK_GET(state) (*(state)->push_back_ptr++)
#define PUSH_BACK_SET(state, text) ((state)->push_back_ptr = (text))
#ifndef DEF_MAX_CLIENT_COUNT
#define DEF_MAX_CLIENT_COUNT 256
#endif
#define SOFT_ERROR_RESP "450 4.3.0 Error: command failed"
#define HARD_ERROR_RESP "500 5.3.0 Error: command failed"
/*
* We can't rely on vstream auto-flushing, so we have to prepare for the
* next read request.
*/
#define SMTP_FLUSH(fp) do { \
if (vstream_peek(fp) <= 0 && readable(vstream_fileno(fp)) <= 0) \
smtp_flush(fp); \
} while (0)
static int var_tmout = 100;
static int var_max_line_length = 2048;
static char *var_myhostname;
static char *soft_error_resp = SOFT_ERROR_RESP;
static char *hard_error_resp = HARD_ERROR_RESP;
static int command_read(SINK_STATE *);
static int data_read(SINK_STATE *);
static void disconnect(SINK_STATE *);
static void read_timeout(int, void *);
static void read_event(int, void *);
static int show_count;
static int sess_count;
static int quit_count;
static int mesg_count;
static int max_quit_count;
static int max_msg_quit_count;
static int disable_pipelining;
static int disable_8bitmime;
static int disable_esmtp;
static int enable_lmtp;
static int pretend_pix;
static int disable_saslauth;
static int disable_xclient;
static int disable_xforward;
static int disable_enh_status;
static int disable_dsn;
static int max_client_count = DEF_MAX_CLIENT_COUNT;
static int client_count;
static int sock;
static int abort_delay = -1;
static int data_read_delay = 0;
static char *single_template; /* individual template */
static char *shared_template; /* shared template */
static VSTRING *start_string; /* dump content prefix */
static INET_PROTO_INFO *proto_info;
#define STR(x) vstring_str(x)
/* do_stats - show counters */
static void do_stats(void)
{
vstream_printf("sess=%d quit=%d mesg=%d\r",
sess_count, quit_count, mesg_count);
vstream_fflush(VSTREAM_OUT);
}
/* hard_err_resp - generic hard error response */
static void hard_err_resp(SINK_STATE *state)
{
smtp_printf(state->stream, "%s", hard_error_resp);
SMTP_FLUSH(state->stream);
}
/* soft_err_resp - generic soft error response */
static void soft_err_resp(SINK_STATE *state)
{
smtp_printf(state->stream, "%s", soft_error_resp);
SMTP_FLUSH(state->stream);
}
/* exp_path_template - expand template pathname, static result */
static VSTRING *exp_path_template(const char *template, time_t start_time)
{
static VSTRING *path_buf = 0;
struct tm *lt;
if (path_buf == 0)
path_buf = vstring_alloc(100);
else
VSTRING_RESET(path_buf);
lt = localtime(&start_time);
while (strftime(STR(path_buf), vstring_avail(path_buf), template, lt) == 0)
VSTRING_SPACE(path_buf, vstring_avail(path_buf) + 100);
VSTRING_SKIP(path_buf);
return (path_buf);
}
/* make_parent_dir - create parent directory or bust */
static void make_parent_dir(const char *path, mode_t mode)
{
const char *parent;
parent = sane_dirname((VSTRING *) 0, path);
if (make_dirs(parent, mode) < 0)
msg_fatal("mkdir %s: %m", parent);
}
/* mail_file_open - open mail capture file */
static void mail_file_open(SINK_STATE *state)
{
const char *myname = "mail_file_open";
VSTRING *path_buf;
ssize_t len;
int tries = 0;
/*
* Save the start time for later.
*/
time(&(state->start_time));
/*
* Expand the per-message dumpfile pathname template.
*/
path_buf = exp_path_template(single_template, state->start_time);
/*
* Append a random hexadecimal string to the pathname and create a new
* file. Retry with a different path if the file already exists. Create
* intermediate directories on the fly when the template specifies
* multiple pathname segments.
*/
#define ID_FORMAT "%08x"
for (len = VSTRING_LEN(path_buf); /* void */ ; vstring_truncate(path_buf, len)) {
if (++tries > 100)
msg_fatal("%s: something is looping", myname);
state->id = myrand();
vstring_sprintf_append(path_buf, ID_FORMAT, state->id);
if ((state->dump_file = vstream_fopen(STR(path_buf),
O_RDWR | O_CREAT | O_EXCL,
0644)) != 0) {
break;
} else if (errno == EEXIST) {
continue;
} else if (errno == ENOENT) {
make_parent_dir(STR(path_buf), 0755);
continue;
} else {
msg_fatal("open %s: %m", STR(path_buf));
}
}
/*
* Don't leave temporary files behind.
*/
if (shared_template != 0 && unlink(STR(path_buf)) < 0)
msg_fatal("unlink %s: %m", STR(path_buf));
/*
* Do initial header records.
*/
if (start_string)
vstream_fprintf(state->dump_file, "%s", STR(start_string));
vstream_fprintf(state->dump_file, "X-Client-Addr: %s%s\n",
state->addr_prefix, state->client_addr.buf);
vstream_fprintf(state->dump_file, "X-Client-Proto: %s\n", state->client_proto);
if (state->helo_args)
vstream_fprintf(state->dump_file, "X-Helo-Args: %s\n", state->helo_args);
/* Note: there may be more than one recipient. */
}
/* mail_file_finish_header - do final smtp-sink generated header records */
static void mail_file_finish_header(SINK_STATE *state)
{
if (state->helo_args)
vstream_fprintf(state->dump_file, "Received: from %s ([%s%s])\n",
state->helo_args, state->addr_prefix,
state->client_addr.buf);
else
vstream_fprintf(state->dump_file, "Received: from [%s%s] ([%s%s])\n",
state->addr_prefix, state->client_addr.buf,
state->addr_prefix, state->client_addr.buf);
vstream_fprintf(state->dump_file, "\tby %s (smtp-sink)"
" with %s id " ID_FORMAT ";\n",
var_myhostname, state->client_proto, state->id);
vstream_fprintf(state->dump_file, "\t%s\n", mail_date(state->start_time));
}
/* mail_file_cleanup - common cleanup for capture file */
static void mail_file_cleanup(SINK_STATE *state)
{
(void) vstream_fclose(state->dump_file);
state->dump_file = 0;
}
/* mail_file_finish - handle message completion for capture file */
static void mail_file_finish(SINK_STATE *state)
{
/*
* Optionally append the captured message to a shared dumpfile.
*/
if (shared_template) {
const char *out_path;
VSTREAM *out_fp;
ssize_t count;
/*
* Expand the shared dumpfile pathname template.
*/
out_path = STR(exp_path_template(shared_template, state->start_time));
/*
* Open the shared dump file.
*/
#define OUT_OPEN_FLAGS (O_WRONLY | O_CREAT | O_APPEND)
#define OUT_OPEN_MODE 0644
if ((out_fp = vstream_fopen(out_path, OUT_OPEN_FLAGS, OUT_OPEN_MODE))
== 0 && errno == ENOENT) {
make_parent_dir(out_path, 0755);
out_fp = vstream_fopen(out_path, OUT_OPEN_FLAGS, OUT_OPEN_MODE);
}
if (out_fp == 0)
msg_fatal("open %s: %m", out_path);
/*
* Append message content from single-message dump file.
*/
if (vstream_fseek(state->dump_file, 0L, SEEK_SET) < 0)
msg_fatal("seek file %s: %m", VSTREAM_PATH(state->dump_file));
VSTRING_RESET(state->buffer);
for (;;) {
count = vstream_fread(state->dump_file, STR(state->buffer),
vstring_avail(state->buffer));
if (count <= 0)
break;
if (vstream_fwrite(out_fp, STR(state->buffer), count) != count)
msg_fatal("append file %s: %m", out_path);
}
if (vstream_ferror(state->dump_file))
msg_fatal("read file %s: %m", VSTREAM_PATH(state->dump_file));
if (vstream_fclose(out_fp))
msg_fatal("append file %s: %m", out_path);
}
mail_file_cleanup(state);
}
/* mail_file_reset - abort mail to capture file */
static void mail_file_reset(SINK_STATE *state)
{
if (shared_template == 0
&& unlink(VSTREAM_PATH(state->dump_file)) < 0
&& errno != ENOENT)
msg_fatal("unlink %s: %m", VSTREAM_PATH(state->dump_file));
mail_file_cleanup(state);
}
/* mail_cmd_reset - reset mail transaction information */
static void mail_cmd_reset(SINK_STATE *state)
{
state->in_mail = 0;
/* Not: state->rcpts = 0. This breaks the DOT reply with LMTP. */
if (state->dump_file)
mail_file_reset(state);
}
/* ehlo_response - respond to EHLO command */
static void ehlo_response(SINK_STATE *state, const char *args)
{
#define SKIP(cp, cond) do { \
for (/* void */; *cp && (cond); cp++) \
/* void */; \
} while (0)
/* EHLO aborts a mail transaction in progress. */
mail_cmd_reset(state);
if (enable_lmtp == 0)
state->client_proto = "ESMTP";
smtp_printf(state->stream, "250-%s", var_myhostname);
if (!disable_pipelining)
smtp_printf(state->stream, "250-PIPELINING");
if (!disable_8bitmime)
smtp_printf(state->stream, "250-8BITMIME");
if (!disable_saslauth)
smtp_printf(state->stream, "250-AUTH PLAIN LOGIN");
if (!disable_xclient)
smtp_printf(state->stream, "250-XCLIENT NAME HELO");
if (!disable_xforward)
smtp_printf(state->stream, "250-XFORWARD NAME ADDR PROTO HELO");
if (!disable_enh_status)
smtp_printf(state->stream, "250-ENHANCEDSTATUSCODES");
if (!disable_dsn)
smtp_printf(state->stream, "250-DSN");
/* RFC 821/2821/5321: Format is replycode<SPACE>optional-text<CRLF> */
smtp_printf(state->stream, "250 ");
SMTP_FLUSH(state->stream);
if (single_template) {
if (state->helo_args)
myfree(state->helo_args);
SKIP(args, ISSPACE(*args));
state->helo_args = mystrdup(args);
}
}
/* helo_response - respond to HELO command */
static void helo_response(SINK_STATE *state, const char *args)
{
/* HELO aborts a mail transaction in progress. */
mail_cmd_reset(state);
state->client_proto = "SMTP";
smtp_printf(state->stream, "250 %s", var_myhostname);
SMTP_FLUSH(state->stream);
if (single_template) {
if (state->helo_args)
myfree(state->helo_args);
SKIP(args, ISSPACE(*args));
state->helo_args = mystrdup(args);
}
}
/* ok_response - send 250 OK */
static void ok_response(SINK_STATE *state, const char *unused_args)
{
smtp_printf(state->stream, "250 2.0.0 Ok");
SMTP_FLUSH(state->stream);
}
/* rset_response - reset, send 250 OK */
static void rset_response(SINK_STATE *state, const char *unused_args)
{
mail_cmd_reset(state);
smtp_printf(state->stream, "250 2.1.0 Ok");
SMTP_FLUSH(state->stream);
}
/* mail_response - reset recipient count, send 250 OK */
static void mail_response(SINK_STATE *state, const char *args)
{
if (state->in_mail) {
smtp_printf(state->stream, "503 5.5.1 Error: nested MAIL command");
SMTP_FLUSH(state->stream);
return;
}
state->in_mail++;
state->rcpts = 0;
smtp_printf(state->stream, "250 2.1.0 Ok");
SMTP_FLUSH(state->stream);
if (single_template) {
mail_file_open(state);
SKIP(args, *args != ':');
SKIP(args, *args == ':');
SKIP(args, ISSPACE(*args));
vstream_fprintf(state->dump_file, "X-Mail-Args: %s\n", args);
}
}
/* rcpt_response - bump recipient count, send 250 OK */
static void rcpt_response(SINK_STATE *state, const char *args)
{
if (state->in_mail == 0) {
smtp_printf(state->stream, "503 5.5.1 Error: need MAIL command");
SMTP_FLUSH(state->stream);
return;
}
state->rcpts++;
smtp_printf(state->stream, "250 2.1.5 Ok");
SMTP_FLUSH(state->stream);
/* Note: there may be more than one recipient per mail transaction. */
if (state->dump_file) {
SKIP(args, *args != ':');
SKIP(args, *args == ':');
SKIP(args, ISSPACE(*args));
vstream_fprintf(state->dump_file, "X-Rcpt-Args: %s\n", args);
}
}
/* abort_event - delayed abort after DATA command */
static void abort_event(int unused_event, void *context)
{
SINK_STATE *state = (SINK_STATE *) context;
smtp_printf(state->stream, "550 This violates SMTP");
SMTP_FLUSH(state->stream);
disconnect(state);
}
/* delay_read_event - resume input event handling */
static void delay_read_event(int event, void *context)
{
SINK_STATE *state = (SINK_STATE *) context;
if (event != EVENT_TIME)
msg_panic("delay_read_event: non-timer event %d", event);
event_enable_read(vstream_fileno(state->stream), read_event, (void *) state);
event_request_timer(read_timeout, (void *) state, var_tmout);
}
/* delay_read - temporarily suspend input event handling */
static void delay_read(SINK_STATE *state, int delay)
{
event_disable_readwrite(vstream_fileno(state->stream));
event_cancel_timer(read_timeout, (void *) state);
event_request_timer(delay_read_event, (void *) state, delay);
}
/* data_response - respond to DATA command */
static void data_response(SINK_STATE *state, const char *unused_args)
{
if (state->in_mail == 0 || state->rcpts == 0) {
smtp_printf(state->stream, "503 5.5.1 Error: need RCPT command");
SMTP_FLUSH(state->stream);
return;
}
/* Not: ST_ANY. */
state->data_state = ST_CR_LF;
smtp_printf(state->stream, "354 End data with <CR><LF>.<CR><LF>");
SMTP_FLUSH(state->stream);
if (abort_delay < 0) {
state->read_fn = data_read;
/* Todo: move into code that invokes the command response function. */
if (data_read_delay > 0)
delay_read(state, data_read_delay);
} else {
/* Stop reading, send premature 550, and disconnect. */
event_disable_readwrite(vstream_fileno(state->stream));
event_cancel_timer(read_event, (void *) state);
event_request_timer(abort_event, (void *) state, abort_delay);
}
if (state->dump_file)
mail_file_finish_header(state);
}
/* dot_resp_hard - hard error response to . command */
static void dot_resp_hard(SINK_STATE *state)
{
if (enable_lmtp) {
while (state->rcpts-- > 0) /* XXX this could block */
smtp_printf(state->stream, "%s", hard_error_resp);
} else {
smtp_printf(state->stream, "%s", hard_error_resp);
}
SMTP_FLUSH(state->stream);
}
/* dot_resp_soft - soft error response to . command */
static void dot_resp_soft(SINK_STATE *state)
{
if (enable_lmtp) {
while (state->rcpts-- > 0) /* XXX this could block */
smtp_printf(state->stream, "%s", soft_error_resp);
} else {
smtp_printf(state->stream, "%s", soft_error_resp);
}
SMTP_FLUSH(state->stream);
}
/* dot_response - response to . command */
static void dot_response(SINK_STATE *state, const char *unused_args)
{
if (enable_lmtp) {
while (state->rcpts-- > 0) /* XXX this could block */
smtp_printf(state->stream, "250 2.2.0 Ok");
} else {
smtp_printf(state->stream, "250 2.0.0 Ok");
}
SMTP_FLUSH(state->stream);
}
/* quit_response - respond to QUIT command */
static void quit_response(SINK_STATE *state, const char *unused_args)
{
smtp_printf(state->stream, "221 Bye");
smtp_flush(state->stream); /* not: SMTP_FLUSH */
if (show_count)
quit_count++;
}
/* conn_response - respond to connect command */
static void conn_response(SINK_STATE *state, const char *unused_args)
{
if (pretend_pix)
smtp_printf(state->stream, "220 ********");
else if (disable_esmtp)
smtp_printf(state->stream, "220 %s", var_myhostname);
else
smtp_printf(state->stream, "220 %s ESMTP", var_myhostname);
SMTP_FLUSH(state->stream);
}
/* delay_event - delayed command response */
static void delay_event(int unused_event, void *context)
{
SINK_STATE *state = (SINK_STATE *) context;
switch (vstream_setjmp(state->stream)) {
default:
msg_panic("unknown read/write error");
/* NOTREACHED */
case SMTP_ERR_TIME:
msg_warn("write timeout");
disconnect(state);
return;
case SMTP_ERR_EOF:
msg_warn("lost connection");
disconnect(state);
return;
case 0:
state->delayed_response(state, state->delayed_args);
myfree(state->delayed_args);
state->delayed_args = 0;
break;
}
if (state->delayed_response == quit_response) {
disconnect(state);
return;
}
state->delayed_response = 0;
/* Resume input event handling after the delayed response. */
event_enable_read(vstream_fileno(state->stream), read_event, (void *) state);
event_request_timer(read_timeout, (void *) state, var_tmout);
}
/* data_read - read data from socket */
static int data_read(SINK_STATE *state)
{
int ch;
struct data_trans {
int state;
int want;
int next_state;
};
static struct data_trans data_trans[] = {
ST_ANY, '\r', ST_CR,
ST_CR, '\n', ST_CR_LF,
ST_CR_LF, '.', ST_CR_LF_DOT,
ST_CR_LF_DOT, '\r', ST_CR_LF_DOT_CR,
ST_CR_LF_DOT_CR, '\n', ST_CR_LF_DOT_CR_LF,
};
struct data_trans *dp;
/*
* A read may result in EOF, but is never supposed to time out - a time
* out means that we were trying to read when no data was available.
*/
for (;;) {
if ((ch = VSTREAM_GETC(state->stream)) == VSTREAM_EOF)
return (-1);
for (dp = data_trans; dp->state != state->data_state; dp++)
/* void */ ;
/*
* Try to match the current character desired by the state machine.
* If that fails, try to restart the machine with a match for its
* first state. This covers the case of a CR/LF/CR/LF sequence
* (empty line) right before the end of the message data.
*/
if (ch == dp->want)
state->data_state = dp->next_state;
else if (ch == data_trans[0].want)
state->data_state = data_trans[0].next_state;
else
state->data_state = ST_ANY;
if (state->dump_file) {
if (ch != '\r' && state->data_state != ST_CR_LF_DOT)
VSTREAM_PUTC(ch, state->dump_file);
if (vstream_ferror(state->dump_file))
msg_fatal("append file %s: %m", VSTREAM_PATH(state->dump_file));
}
if (state->data_state == ST_CR_LF_DOT_CR_LF) {
PUSH_BACK_SET(state, ".\r\n");
state->read_fn = command_read;
state->data_state = ST_ANY;
if (state->dump_file)
mail_file_finish(state);
mail_cmd_reset(state);
if (show_count || max_msg_quit_count > 0) {
mesg_count++;
if (show_count)
do_stats();
if (max_msg_quit_count > 0 && mesg_count >= max_msg_quit_count)
exit(0);
}
break;
}
/*
* We must avoid blocking I/O, so get out of here as soon as both the
* VSTREAM and kernel read buffers dry up.
*/
if (vstream_peek(state->stream) <= 0
&& readable(vstream_fileno(state->stream)) <= 0)
return (0);
}
return (0);
}
/*
* The table of all SMTP commands that we can handle.
*/
typedef struct SINK_COMMAND {
const char *name;
void (*response) (SINK_STATE *, const char *);
void (*hard_response) (SINK_STATE *);
void (*soft_response) (SINK_STATE *);
int flags;
int delay;
int delay_odds;
} SINK_COMMAND;
#define FLAG_ENABLE (1<<0) /* command is enabled */
#define FLAG_SYSLOG (1<<1) /* log the command */
#define FLAG_HARD_ERR (1<<2) /* report hard error */
#define FLAG_SOFT_ERR (1<<3) /* report soft error */
#define FLAG_DISCONNECT (1<<4) /* disconnect */
#define FLAG_CLOSE (1<<5) /* say goodbye and disconnect */
static SINK_COMMAND command_table[] = {
"connect", conn_response, hard_err_resp, soft_err_resp, 0, 0, 0,
"helo", helo_response, hard_err_resp, soft_err_resp, 0, 0, 0,
"ehlo", ehlo_response, hard_err_resp, soft_err_resp, 0, 0, 0,
"lhlo", ehlo_response, hard_err_resp, soft_err_resp, 0, 0, 0,
"xclient", ok_response, hard_err_resp, soft_err_resp, FLAG_ENABLE, 0, 0,
"xforward", ok_response, hard_err_resp, soft_err_resp, FLAG_ENABLE, 0, 0,
"auth", ok_response, hard_err_resp, soft_err_resp, FLAG_ENABLE, 0, 0,
"mail", mail_response, hard_err_resp, soft_err_resp, FLAG_ENABLE, 0, 0,
"rcpt", rcpt_response, hard_err_resp, soft_err_resp, FLAG_ENABLE, 0, 0,
"data", data_response, hard_err_resp, soft_err_resp, FLAG_ENABLE, 0, 0,
".", dot_response, dot_resp_hard, dot_resp_soft, FLAG_ENABLE, 0, 0,
"rset", rset_response, hard_err_resp, soft_err_resp, FLAG_ENABLE, 0, 0,
"noop", ok_response, hard_err_resp, soft_err_resp, FLAG_ENABLE, 0, 0,
"vrfy", ok_response, hard_err_resp, soft_err_resp, FLAG_ENABLE, 0, 0,
"quit", quit_response, hard_err_resp, soft_err_resp, FLAG_ENABLE, 0, 0,
0,
};
/* reset_cmd_flags - reset per-command command flags */
static void reset_cmd_flags(const char *cmd, int flags)
{
SINK_COMMAND *cmdp;
for (cmdp = command_table; cmdp->name != 0; cmdp++)
if (strcasecmp(cmd, cmdp->name) == 0)
break;
if (cmdp->name == 0)
msg_fatal("unknown command: %s", cmd);
cmdp->flags &= ~flags;
}
/* set_cmd_flags - set per-command command flags */
static void set_cmd_flags(const char *cmd, int flags)
{
SINK_COMMAND *cmdp;
for (cmdp = command_table; cmdp->name != 0; cmdp++)
if (strcasecmp(cmd, cmdp->name) == 0)
break;
if (cmdp->name == 0)
msg_fatal("unknown command: %s", cmd);
cmdp->flags |= flags;
}
/* set_cmds_flags - set per-command flags for multiple commands */
static void set_cmds_flags(const char *cmds, int flags)
{
char *saved_cmds;
char *cp;
char *cmd;
saved_cmds = cp = mystrdup(cmds);
while ((cmd = mystrtok(&cp, CHARS_COMMA_SP)) != 0)
set_cmd_flags(cmd, flags);
myfree(saved_cmds);
}
/* set_cmd_delay - set per-command delay */
static void set_cmd_delay(const char *cmd, int delay, int odds)
{
SINK_COMMAND *cmdp;
for (cmdp = command_table; cmdp->name != 0; cmdp++)
if (strcasecmp(cmd, cmdp->name) == 0)
break;
if (cmdp->name == 0)
msg_fatal("unknown command: %s", cmd);
if (delay <= 0)
msg_fatal("non-positive '%s' delay", cmd);
if (odds < 0 || odds > 99)
msg_fatal("delay odds for '%s' out of range", cmd);
cmdp->delay = delay;
cmdp->delay_odds = odds;
}
/* set_cmd_delay_arg - set per-command delay from option argument */
static void set_cmd_delay_arg(char *arg)
{
char *cp;
char *saved_arg;
char *cmd;
char *delay;
char *odds;
saved_arg = cp = mystrdup(arg);
cmd = mystrtok(&cp, ":");
delay = mystrtok(&cp, ":");
if (cmd == 0 || delay == 0)
msg_fatal("invalid command delay argument: %s", arg);
odds = mystrtok(&cp, "");
set_cmd_delay(cmd, atoi(delay), odds ? atoi(odds) : 0);
myfree(saved_arg);
}
/* command_resp - respond to command */
static int command_resp(SINK_STATE *state, SINK_COMMAND *cmdp,
const char *command, const char *args)
{
/* We use raw syslog. Sanitize data content and length. */
if (cmdp->flags & FLAG_SYSLOG)
syslog(LOG_INFO, "%s %.100s", command, args);
if (cmdp->flags & FLAG_DISCONNECT)
return (-1);
if (cmdp->flags & FLAG_CLOSE) {
smtp_printf(state->stream, "421 4.0.0 Server closing connection");
return (-1);
}
if (cmdp->flags & FLAG_HARD_ERR) {
cmdp->hard_response(state);
return (0);
}
if (cmdp->flags & FLAG_SOFT_ERR) {
cmdp->soft_response(state);
return (0);
}
if (cmdp->delay > 0) {
int delay = cmdp->delay;
if (cmdp->delay_odds > 0)
for (delay = 0;
((int) (100.0 * rand() / (RAND_MAX + 1.0))) < cmdp->delay_odds;
delay += cmdp->delay)
/* NOP */ ;
/* Suspend input event handling while delaying the command response. */
event_disable_readwrite(vstream_fileno(state->stream));
event_cancel_timer(read_timeout, (void *) state);
event_request_timer(delay_event, (void *) state, delay);
state->delayed_response = cmdp->response;
state->delayed_args = mystrdup(args);
} else {
cmdp->response(state, args);
if (cmdp->response == quit_response)
return (-1);
}
return (0);
}
/* command_read - talk the SMTP protocol, server side */
static int command_read(SINK_STATE *state)
{
char *command;
SINK_COMMAND *cmdp;
int ch;
struct cmd_trans {
int state;
int want;
int next_state;
};
static struct cmd_trans cmd_trans[] = {
ST_ANY, '\r', ST_CR,
ST_CR, '\n', ST_CR_LF,
0, 0, 0,
};
struct cmd_trans *cp;
char *ptr;
/*
* A read may result in EOF, but is never supposed to time out - a time
* out means that we were trying to read when no data was available.
*/
#define NEXT_CHAR(state) \
(PUSH_BACK_PEEK(state) ? PUSH_BACK_GET(state) : VSTREAM_GETC(state->stream))
if (state->data_state == ST_CR_LF)
state->data_state = ST_ANY; /* XXX */
for (;;) {
if ((ch = NEXT_CHAR(state)) == VSTREAM_EOF)
return (-1);
/*
* Sanity check. We don't want to store infinitely long commands.
*/
if (VSTRING_LEN(state->buffer) >= var_max_line_length) {
msg_warn("command line too long");
return (-1);
}
VSTRING_ADDCH(state->buffer, ch);
/*
* Try to match the current character desired by the state machine.
* If that fails, try to restart the machine with a match for its
* first state.
*/
for (cp = cmd_trans; cp->state != state->data_state; cp++)
if (cp->want == 0)
msg_panic("command_read: unknown state: %d", state->data_state);
if (ch == cp->want)
state->data_state = cp->next_state;
else if (ch == cmd_trans[0].want)
state->data_state = cmd_trans[0].next_state;
else
state->data_state = ST_ANY;
if (state->data_state == ST_CR_LF)
break;
/*
* We must avoid blocking I/O, so get out of here as soon as both the
* VSTREAM and kernel read buffers dry up.
*
* XXX Solaris non-blocking read() may fail on a socket when ioctl
* FIONREAD reports there is unread data. Diagnosis by Max Pashkov.
* As a workaround we use readable() (which uses poll or select())
* instead of peek_fd() (which uses ioctl FIONREAD). Workaround added
* 20020604.
*/
if (PUSH_BACK_PEEK(state) == 0 && vstream_peek(state->stream) <= 0
&& readable(vstream_fileno(state->stream)) <= 0)
return (0);
}
/*
* Properly terminate the result, and reset the buffer write pointer for
* reading the next command. This is ugly, but not as ugly as trying to
* deal with all the early returns below.
*/
vstring_truncate(state->buffer, VSTRING_LEN(state->buffer) - 2);
VSTRING_TERMINATE(state->buffer);
state->data_state = ST_CR_LF;
VSTRING_RESET(state->buffer);
/*
* Got a complete command line. Parse it.
*/
ptr = vstring_str(state->buffer);
if (msg_verbose)
msg_info("%s", ptr);
if ((command = mystrtok(&ptr, " \t")) == 0) {
smtp_printf(state->stream, "500 5.5.2 Error: unknown command");
SMTP_FLUSH(state->stream);
return (0);
}
for (cmdp = command_table; cmdp->name != 0; cmdp++)
if (strcasecmp(command, cmdp->name) == 0)
break;
if (cmdp->name == 0 || (cmdp->flags & FLAG_ENABLE) == 0) {
smtp_printf(state->stream, "500 5.5.1 Error: unknown command");
SMTP_FLUSH(state->stream);
return (0);
}
return (command_resp(state, cmdp, command, printable(ptr, '?')));
}
/* read_timeout - handle timer event */
static void read_timeout(int unused_event, void *context)
{
SINK_STATE *state = (SINK_STATE *) context;
/*
* We don't send anything to the client, because we would have to set up
* an smtp_stream exception handler first. And that is just too much
* trouble.
*/
msg_warn("read timeout");
disconnect(state);
}
/* read_event - handle command or data read events */
static void read_event(int unused_event, void *context)
{
SINK_STATE *state = (SINK_STATE *) context;
/*
* The input reading routine not only reads input (with vstream calls)
* but also produces output (with smtp_stream calls). Because the output
* routines can raise timeout or EOF exceptions with vstream_longjmp(),
* the input reading routine needs to set up corresponding exception
* handlers with vstream_setjmp(). Guarding the input operations in the
* same manner is not useful: we must read input in non-blocking mode, so
* we never get called when the socket stays unreadable too long. And EOF
* is already trivial to detect with the vstream calls.
*/
do {
switch (vstream_setjmp(state->stream)) {
default:
msg_panic("unknown read/write error");
/* NOTREACHED */
case SMTP_ERR_TIME:
msg_warn("write timeout");
disconnect(state);
return;
case SMTP_ERR_EOF:
msg_warn("lost connection");
disconnect(state);
return;
case 0:
if (state->read_fn(state) < 0) {
if (msg_verbose)
msg_info("disconnect");
disconnect(state);
return;
}
}
} while (PUSH_BACK_PEEK(state) != 0 || vstream_peek(state->stream) > 0);
/*
* Reset the idle timer. Wait until the next input event, or until the
* idle timer goes off.
*/
event_request_timer(read_timeout, (void *) state, var_tmout);
}
static void connect_event(int, void *);
/* disconnect - handle disconnection events */
static void disconnect(SINK_STATE *state)
{
event_disable_readwrite(vstream_fileno(state->stream));
event_cancel_timer(read_timeout, (void *) state);
if (show_count) {
sess_count++;
do_stats();
}
vstream_fclose(state->stream);
vstring_free(state->buffer);
/* Clean up file capture attributes. */
if (state->helo_args)
myfree(state->helo_args);
/* Delete incomplete mail transaction. */
mail_cmd_reset(state);
if (state->delayed_args)
myfree(state->delayed_args);
myfree((void *) state);
if (max_quit_count > 0 && quit_count >= max_quit_count)
exit(0);
if (client_count-- == max_client_count)
event_enable_read(sock, connect_event, (void *) 0);
}
/* connect_event - handle connection events */
static void connect_event(int unused_event, void *unused_context)
{
struct sockaddr_storage ss;
SOCKADDR_SIZE len = sizeof(ss);
struct sockaddr *sa = (struct sockaddr *) &ss;
SINK_STATE *state;
int fd;
if ((fd = sane_accept(sock, sa, &len)) >= 0) {
/* Safety: limit the number of open sockets and capture files. */
if (++client_count == max_client_count)
event_disable_readwrite(sock);
state = (SINK_STATE *) mymalloc(sizeof(*state));
if (strchr((char *) proto_info->sa_family_list, sa->sa_family))
SOCKADDR_TO_HOSTADDR(sa, len, &state->client_addr,
(MAI_SERVPORT_STR *) 0, sa->sa_family);
else
strncpy(state->client_addr.buf, "local", sizeof("local"));
if (msg_verbose)
msg_info("connect (%s %s)",
#ifdef AF_LOCAL
sa->sa_family == AF_LOCAL ? "AF_LOCAL" :
#else
sa->sa_family == AF_UNIX ? "AF_UNIX" :
#endif
sa->sa_family == AF_INET ? "AF_INET" :
#ifdef AF_INET6
sa->sa_family == AF_INET6 ? "AF_INET6" :
#endif
"unknown protocol family",
state->client_addr.buf);
non_blocking(fd, NON_BLOCKING);
state->stream = vstream_fdopen(fd, O_RDWR);
vstream_tweak_sock(state->stream);
state->buffer = vstring_alloc(1024);
state->read_fn = command_read;
state->data_state = ST_ANY;
PUSH_BACK_SET(state, "");
smtp_timeout_setup(state->stream, var_tmout);
state->in_mail = 0;
state->rcpts = 0;
state->delayed_response = 0;
state->delayed_args = 0;
/* Initialize file capture attributes. */
#ifdef AF_INET6
if (sa->sa_family == AF_INET6)
state->addr_prefix = "ipv6:";
else
#endif
state->addr_prefix = "";
state->helo_args = 0;
state->client_proto = enable_lmtp ? "LMTP" : "SMTP";
state->start_time = 0;
state->id = 0;
state->dump_file = 0;
/*
* We use the smtp_stream module to produce output. That module
* throws an exception via vstream_longjmp() in case of a timeout or
* lost connection error. Therefore we must prepare to handle these
* exceptions with vstream_setjmp().
*/
switch (vstream_setjmp(state->stream)) {
default:
msg_panic("unknown read/write error");
/* NOTREACHED */
case SMTP_ERR_TIME:
msg_warn("write timeout");
disconnect(state);
return;
case SMTP_ERR_EOF:
msg_warn("lost connection");
disconnect(state);
return;
case 0:
if (command_resp(state, command_table, "connect", "") < 0)
disconnect(state);
else if (command_table->delay == 0) {
event_enable_read(fd, read_event, (void *) state);
event_request_timer(read_timeout, (void *) state, var_tmout);
}
}
}
}
/* usage - explain */
static void usage(char *myname)
{
msg_fatal("usage: %s [-468acCeEFLpPv] [-A abort_delay] [-b soft_bounce_reply] [-B hard_bounce_reply] [-d dump-template] [-D dump-template] [-f commands] [-h hostname] [-m max_concurrency] [-M message_quit_count] [-n quit_count] [-q commands] [-r commands] [-R root-dir] [-s commands] [-S start-string] [-u user_privs] [-w delay] [host]:port backlog", myname);
}
MAIL_VERSION_STAMP_DECLARE;
int main(int argc, char **argv)
{
int backlog;
int ch;
int delay;
const char *protocols = INET_PROTO_NAME_ALL;
const char *root_dir = 0;
const char *user_privs = 0;
/*
* Fingerprint executables and core dumps.
*/
MAIL_VERSION_STAMP_ALLOCATE;
/*
* Fix 20051207.
*/
signal(SIGPIPE, SIG_IGN);
/*
* Initialize diagnostics.
*/
msg_vstream_init(argv[0], VSTREAM_ERR);
/*
* Parse JCL.
*/
while ((ch = GETOPT(argc, argv, "468aA:b:B:cCd:D:eEf:Fh:H:Ln:m:M:NpPq:Q:r:R:s:S:t:T:u:vw:W:")) > 0) {
switch (ch) {
case '4':
protocols = INET_PROTO_NAME_IPV4;
break;
case '6':
protocols = INET_PROTO_NAME_IPV6;
break;
case '8':
disable_8bitmime = 1;
break;
case 'a':
disable_saslauth = 1;
break;
case 'A':
if (!alldig(optarg) || (abort_delay = atoi(optarg)) < 0)
usage(argv[0]);
break;
case 'b':
if (optarg[0] != '4' || strspn(optarg, "0123456789") != 3) {
msg_error("bad soft error reply: %s", optarg);
usage(argv[0]);
} else
soft_error_resp = optarg;
break;
case 'B':
if (optarg[0] != '5' || strspn(optarg, "0123456789") != 3) {
msg_error("bad hard error reply: %s", optarg);
usage(argv[0]);
} else
hard_error_resp = optarg;
break;
case 'c':
show_count++;
break;
case 'C':
disable_xclient = 1;
reset_cmd_flags("xclient", FLAG_ENABLE);
break;
case 'd':
single_template = optarg;
break;
case 'D':
shared_template = optarg;
break;
case 'e':
disable_esmtp = 1;
break;
case 'E':
disable_enh_status = 1;
break;
case 'f':
set_cmds_flags(optarg, FLAG_HARD_ERR);
disable_pipelining = 1;
break;
case 'F':
disable_xforward = 1;
reset_cmd_flags("xforward", FLAG_ENABLE);
break;
case 'h':
var_myhostname = optarg;
break;
case 'H':
if ((data_read_delay = atoi(optarg)) <= 0)
msg_fatal("bad data read delay: %s", optarg);
break;
case 'L':
enable_lmtp = 1;
break;
case 'm':
if ((max_client_count = atoi(optarg)) <= 0)
msg_fatal("bad concurrency limit: %s", optarg);
break;
case 'M':
if ((max_msg_quit_count = atoi(optarg)) <= 0)
msg_fatal("bad message quit count: %s", optarg);
break;
case 'n':
if ((max_quit_count = atoi(optarg)) <= 0)
msg_fatal("bad quit count: %s", optarg);
break;
case 'N':
disable_dsn = 1;
break;
case 'p':
disable_pipelining = 1;
break;
case 'P':
pretend_pix = 1;
disable_esmtp = 1;
break;
case 'q':
set_cmds_flags(optarg, FLAG_DISCONNECT);
break;
case 'Q':
set_cmds_flags(optarg, FLAG_CLOSE);
break;
case 'r':
set_cmds_flags(optarg, FLAG_SOFT_ERR);
disable_pipelining = 1;
break;
case 'R':
root_dir = optarg;
break;
case 's':
openlog(basename(argv[0]), LOG_PID, LOG_MAIL);
set_cmds_flags(optarg, FLAG_SYSLOG);
break;
case 'S':
start_string = vstring_alloc(10);
unescape(start_string, optarg);
break;
case 't':
if ((var_tmout = atoi(optarg)) <= 0)
msg_fatal("bad timeout: %s", optarg);
break;
case 'T':
if ((inet_windowsize = atoi(optarg)) <= 0)
msg_fatal("bad TCP window size: %s", optarg);
break;
case 'u':
user_privs = optarg;
break;
case 'v':
msg_verbose++;
break;
case 'w':
if ((delay = atoi(optarg)) <= 0)
usage(argv[0]);
set_cmd_delay("data", delay, 0);
break;
case 'W':
set_cmd_delay_arg(optarg);
break;
default:
usage(argv[0]);
}
}
if (argc - optind != 2)
usage(argv[0]);
if ((backlog = atoi(argv[optind + 1])) <= 0)
usage(argv[0]);
if (single_template && shared_template)
msg_fatal("use only one of -d or -D, but not both");
if (geteuid() == 0 && user_privs == 0)
msg_fatal("-u option is required if running as root");
/*
* Initialize.
*/
if (var_myhostname == 0)
var_myhostname = "smtp-sink";
set_cmds_flags(enable_lmtp ? "lhlo" :
disable_esmtp ? "helo" :
"helo, ehlo", FLAG_ENABLE);
proto_info = inet_proto_init("protocols", protocols);
if (strncmp(argv[optind], "unix:", 5) == 0) {
sock = unix_listen(argv[optind] + 5, backlog, BLOCKING);
} else {
if (strncmp(argv[optind], "inet:", 5) == 0)
argv[optind] += 5;
sock = inet_listen(argv[optind], backlog, BLOCKING);
}
if (user_privs)
chroot_uid(root_dir, user_privs);
if (single_template)
mysrand((int) time((time_t *) 0));
else if (shared_template)
single_template = shared_template;
/*
* Start the event handler.
*/
event_enable_read(sock, connect_event, (void *) 0);
for (;;)
event_loop(-1);
}