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// nullmailer -- a simple relay-only MTA
// Copyright (C) 2017 Bruce Guenter <bruce@untroubled.org>
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
// You can contact me at <bruce@untroubled.org>. There is also a mailing list
// available to discuss this package. To subscribe, send an email to
// <nullmailer-subscribe@lists.untroubled.org>.
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "configio.h"
#include "fdbuf/fdbuf.h"
#include "defines.h"
#include "forkexec.h"
#include "setenv.h"
#include "cli++/cli++.h"
const char* cli_program = "sendmail";
const char* cli_help_prefix = "Nullmailer sendmail emulator\n";
const char* cli_help_suffix = 0;
const char* cli_args_usage = "[recipients] <message";
const int cli_args_min = 0;
const int cli_args_max = -1;
const bool cli_only_long = true;
enum mode { mode_normal, mode_mailq, mode_smtp };
static int o_dummyi;
static const char* o_dummys;
static const char* o_sender = 0;
static int o_mode = 0;
static char* o_from;
static int use_header = false;
cli_option cli_options[] = {
{ 'B', 0, cli_option::string, 0, &o_dummys, "Ignored", 0 },
{ 0, "bm", cli_option::flag, mode_normal, &o_mode,
"Read mail from standard input (default)", 0 },
{ 0, "bp", cli_option::flag, mode_mailq, &o_mode,
"List information about mail queue", 0 },
{ 0, "bs", cli_option::flag, mode_smtp, &o_mode,
"Handle SMTP commands on standard input", 0 },
{ 'C', 0, cli_option::string, 0, &o_dummys, "Ignored", 0 },
{ 'd', 0, cli_option::string, 0, &o_dummys, "Ignored", 0 },
{ 'F', 0, cli_option::string, 0, &o_sender,
"Set the full name of the sender", 0 },
{ 'f', 0, cli_option::string, 0, &o_from,
"Set the envelope sender address", 0 },
{ 'h', 0, cli_option::string, 0, &o_dummys, "Ignored", 0 },
{ 'i', 0, cli_option::flag, 0, &o_dummyi, "Ignored", 0 },
{ 'L', 0, cli_option::string, 0, &o_dummys, "Ignored", 0 },
{ 'm', 0, cli_option::flag, 0, &o_dummyi, "Ignored", 0 },
{ 'N', 0, cli_option::string, 0, &o_dummys, "Ignored", 0 },
{ 'n', 0, cli_option::flag, 0, &o_dummyi, "Ignored", 0 },
{ 'O', 0, cli_option::string, 0, &o_dummys, "Ignored", 0 },
{ 'o', 0, cli_option::string, 0, &o_dummys, "Set sendmail option, ignored", 0 },
{ 0, "em", cli_option::flag, 0, &o_dummyi,
"Ignored", 0 },
{ 0, "ep", cli_option::flag, 0, &o_dummyi,
"Ignored", 0 },
{ 0, "eq", cli_option::flag, 0, &o_dummyi,
"Ignored", 0 },
{ 'p', 0, cli_option::string, 0, &o_dummys, "Ignored", 0 },
{ 'q', 0, cli_option::string, 0, &o_dummys, "Ignored", 0 },
{ 'R', 0, cli_option::string, 0, &o_dummys, "Ignored", 0 },
{ 'r', 0, cli_option::string, 0, &o_from,
"An alternate and obsolete form of the -f flag", 0 },
{ 't', 0, cli_option::flag, 1, &use_header,
"Read message for recipients", 0 },
{ 'U', 0, cli_option::flag, 0, &o_dummyi, "Ignored", 0 },
{ 'V', 0, cli_option::string, 0, &o_dummys, "Ignored", 0 },
{ 'v', 0, cli_option::flag, 0, &o_dummyi, "Ignored", 0 },
{ 'X', 0, cli_option::string, 0, &o_dummys, "Ignored", 0 },
CLI_OPTION_END
};
bool setenvelope(char* str)
{
char* at = strchr(str, '@');
if(at) {
*at = 0;
setenv("NULLMAILER_HOST", at+1, 1);
}
setenv("NULLMAILER_USER", str, 1);
return true;
}
int do_exec(const char* program, const char* args[])
{
mystring path = program_path(program);
args[0] = path.c_str();
execv(args[0], (char**)args);
ferr << "sendmail: Could not exec " << program << '.' << endl;
return 1;
}
int cli_main(int argc, char* argv[])
{
const char* extra_args[argc + 5] = {0};
int extra_argc = 1;
switch (o_mode) {
case mode_smtp:
return do_exec("nullmailer-smtpd", extra_args);
case mode_mailq:
return do_exec("mailq", extra_args);
default:
extra_args[extra_argc++] = use_header ? "-b" : "-e";
if(o_sender)
setenv("NULLMAILER_NAME", o_sender, 1);
if(o_from) {
if(!setenvelope(o_from))
return -1;
// pass along empty sender
if(o_from[0] == '\0' || (strcmp(o_from, "<>") == 0)) {
extra_args[extra_argc++] = "-f";
extra_args[extra_argc++] = o_from;
}
}
for(int i = 0; i < argc; i++)
extra_args[extra_argc++] = argv[i];
return do_exec("nullmailer-inject", extra_args);
}
}
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