sendmail.c File Reference

Send email using sendmail. More...

#include "config.h"
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <regex.h>
#include <signal.h>
#include <stdbool.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <unistd.h>
#include "mutt/lib.h"
#include "address/lib.h"
#include "config/lib.h"
#include "core/lib.h"
#include "gui/lib.h"
#include "sendmail.h"
#include "pager/lib.h"
#include "format_flags.h"
#include "globals.h"
#include "muttlib.h"
#include "nntp/lib.h"

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Macros
#define	EX_OK   0

Functions
	ARRAY_HEAD (SendmailArgArray, const char *)
static void	alarm_handler (int sig)
	Async notification of an alarm signal.
static int	send_msg (const char *path, struct SendmailArgArray *args, const char *msg, char **tempfile, int wait_time)
	Invoke sendmail in a subshell.
static void	add_args_one (struct SendmailArgArray *args, const struct Address *addr)
	Add an Address to a dynamic array.
static void	add_args (struct SendmailArgArray *args, struct AddressList *al)
	Add a list of Addresses to a dynamic array.
int	mutt_invoke_sendmail (struct Mailbox *m, struct AddressList *from, struct AddressList *to, struct AddressList *cc, struct AddressList *bcc, const char *msg, bool eightbit, struct ConfigSubset *sub)
	Run sendmail.

Variables
char **	environ
static SIG_ATOMIC_VOLATILE_T	SigAlrm
	true after SIGALRM is received

Detailed Description

Send email using sendmail.

Authors

• Richard Russon

Copyright

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, see http://www.gnu.org/licenses/.

Definition in file sendmail.c.

Macro Definition Documentation

EX_OK

#define EX_OK   0

Definition at line 56 of file sendmail.c.

Function Documentation

ARRAY_HEAD()

ARRAY_HEAD	(	SendmailArgArray	,
		const char *
	)

alarm_handler()

static void alarm_handler ( int  sig )

static

Async notification of an alarm signal.

Parameters

sig	Signal, (SIGALRM)

Definition at line 72 of file sendmail.c.

{
  SigAlrm = 1;
}

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send_msg()

static int send_msg ( const char *  path, struct SendmailArgArray *  args, const char *  msg, char **  tempfile, int  wait_time  )

static

Invoke sendmail in a subshell.

Parameters

[in]	path	Path to program to execute
[in]	args	Arguments to pass to program
[in]	msg	Temp file containing message to send
[out]	tempfile	If sendmail is put in the background, this points to the temporary file containing the stdout of the child process. If it is NULL, stderr and stdout are not redirected.
[in]	wait_time	How long to wait for sendmail, $sendmail_wait

Return values

0	Success
>0	Failure, return code from sendmail

Definition at line 90 of file sendmail.c.

{
  sigset_t set;
  int st;
 
  mutt_sig_block_system();
 
  sigemptyset(&set);
  /* we also don't want to be stopped right now */
  sigaddset(&set, SIGTSTP);
  sigprocmask(SIG_BLOCK, &set, NULL);
 
  if ((wait_time >= 0) && tempfile)
  {
    struct Buffer *tmp = buf_pool_get();
    buf_mktemp(tmp);
    *tempfile = buf_strdup(tmp);
    buf_pool_release(&tmp);
  }
 
  pid_t pid = fork();
  if (pid == 0)
  {
    struct sigaction act = { 0 };
    struct sigaction oldalrm = { 0 };
 
    /* save parent's ID before setsid() */
    pid_t ppid = getppid();
 
    /* we want the delivery to continue even after the main process dies,
     * so we put ourselves into another session right away */
    setsid();
 
    /* next we close all open files */
    close(0);
#ifdef OPEN_MAX
    for (int fd = tempfile ? 1 : 3; fd < OPEN_MAX; fd++)
      close(fd);
#elif defined(_POSIX_OPEN_MAX)
    for (int fd = tempfile ? 1 : 3; fd < _POSIX_OPEN_MAX; fd++)
      close(fd);
#else
    if (tempfile)
    {
      close(1);
      close(2);
    }
#endif
 
    /* now the second fork() */
    pid = fork();
    if (pid == 0)
    {
      /* "msg" will be opened as stdin */
      if (open(msg, O_RDONLY, 0) < 0)
      {
        unlink(msg);
        _exit(S_ERR);
      }
      unlink(msg);
 
      if ((wait_time >= 0) && tempfile && *tempfile)
      {
        /* *tempfile will be opened as stdout */
        if (open(*tempfile, O_WRONLY | O_APPEND | O_CREAT | O_EXCL, 0600) < 0)
          _exit(S_ERR);
        /* redirect stderr to *tempfile too */
        if (dup(1) < 0)
          _exit(S_ERR);
      }
      else if (tempfile)
      {
        if (open("/dev/null", O_WRONLY | O_APPEND) < 0) /* stdout */
          _exit(S_ERR);
        if (open("/dev/null", O_RDWR | O_APPEND) < 0) /* stderr */
          _exit(S_ERR);
      }
 
      /* execvpe is a glibc extension, so just manually set environ */
      environ = EnvList;
      execvp(path, (char **) args->entries);
      _exit(S_ERR);
    }
    else if (pid == -1)
    {
      unlink(msg);
      FREE(tempfile);
      _exit(S_ERR);
    }
 
    /* wait_time > 0: interrupt waitpid() after wait_time seconds
     * wait_time = 0: wait forever
     * wait_time < 0: don't wait */
    if (wait_time > 0)
    {
      SigAlrm = 0;
      act.sa_handler = alarm_handler;
#ifdef SA_INTERRUPT
      /* need to make sure waitpid() is interrupted on SIGALRM */
      act.sa_flags = SA_INTERRUPT;
#else
      act.sa_flags = 0;
#endif
      sigemptyset(&act.sa_mask);
      sigaction(SIGALRM, &act, &oldalrm);
      alarm(wait_time);
    }
    else if (wait_time < 0)
    {
      _exit(0xff & EX_OK);
    }
 
    if (waitpid(pid, &st, 0) > 0)
    {
      st = WIFEXITED(st) ? WEXITSTATUS(st) : S_ERR;
      if (wait_time && (st == (0xff & EX_OK)) && tempfile && *tempfile)
      {
        unlink(*tempfile); /* no longer needed */
        FREE(tempfile);
      }
    }
    else
    {
      st = ((wait_time > 0) && (errno == EINTR) && SigAlrm) ? S_BKG : S_ERR;
      if ((wait_time > 0) && tempfile && *tempfile)
      {
        unlink(*tempfile);
        FREE(tempfile);
      }
    }
 
    if (wait_time > 0)
    {
      /* reset alarm; not really needed, but... */
      alarm(0);
      sigaction(SIGALRM, &oldalrm, NULL);
    }
 
    if ((kill(ppid, 0) == -1) && (errno == ESRCH) && tempfile && *tempfile)
    {
      /* the parent is already dead */
      unlink(*tempfile);
      FREE(tempfile);
    }
 
    _exit(st);
  }
 
  sigprocmask(SIG_UNBLOCK, &set, NULL);
 
  if ((pid != -1) && (waitpid(pid, &st, 0) > 0))
    st = WIFEXITED(st) ? WEXITSTATUS(st) : S_ERR; /* return child status */
  else
    st = S_ERR; /* error */
 
  mutt_sig_unblock_system(true);
 
  return st;
}

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add_args_one()

static void add_args_one ( struct SendmailArgArray *  args, const struct Address *  addr  )

static

Add an Address to a dynamic array.

Parameters

[in,out]	args	Array to add to
[in]	addr	Address to add

Definition at line 256 of file sendmail.c.

{
  /* weed out group mailboxes, since those are for display only */
  if (addr->mailbox && !addr->group)
  {
    ARRAY_ADD(args, buf_string(addr->mailbox));
  }
}

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add_args()

static void add_args ( struct SendmailArgArray *  args, struct AddressList *  al  )

static

Add a list of Addresses to a dynamic array.

Parameters

[in,out]	args	Array to add to
[in]	al	Addresses to add

Definition at line 270 of file sendmail.c.

{
  if (!al)
    return;
 
  struct Address *a = NULL;
  TAILQ_FOREACH(a, al, entries)
  {
    add_args_one(args, a);
  }
}

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mutt_invoke_sendmail()

int mutt_invoke_sendmail	(	struct Mailbox *	m,
		struct AddressList *	from,
		struct AddressList *	to,
		struct AddressList *	cc,
		struct AddressList *	bcc,
		const char *	msg,
		bool	eightbit,
		struct ConfigSubset *	sub
	)

Run sendmail.

Parameters

m	Mailbox
from	The sender
to	Recipients
cc	Recipients
bcc	Recipients
msg	File containing message
eightbit	Message contains 8bit chars
sub	Config Subset

Return values

0	Success
-1	Failure

See also

$inews, nntp_format_str()

Definition at line 297 of file sendmail.c.

{
  char *ps = NULL, *path = NULL, *s = NULL, *childout = NULL;
  struct SendmailArgArray args = ARRAY_HEAD_INITIALIZER;
  struct SendmailArgArray extra_args = ARRAY_HEAD_INITIALIZER;
  int i;
 
#ifdef USE_NNTP
  if (OptNewsSend)
  {
    char cmd[1024] = { 0 };
 
    const char *const c_inews = cs_subset_string(sub, "inews");
    mutt_expando_format(cmd, sizeof(cmd), 0, sizeof(cmd), NONULL(c_inews),
                        nntp_format_str, 0, MUTT_FORMAT_NO_FLAGS);
    if (*cmd == '\0')
    {
      i = nntp_post(m, msg);
      unlink(msg);
      return i;
    }
 
    s = mutt_str_dup(cmd);
  }
  else
#endif
  {
    const char *const c_sendmail = cs_subset_string(sub, "sendmail");
    s = mutt_str_dup(c_sendmail);
  }
 
  if (!s)
  {
    mutt_error(_("$sendmail must be set in order to send mail"));
    return -1;
  }
 
  ps = s;
  i = 0;
  while ((ps = strtok(ps, " ")))
  {
    if (i)
    {
      if (mutt_str_equal(ps, "--"))
        break;
      ARRAY_ADD(&args, ps);
    }
    else
    {
      path = mutt_str_dup(ps);
      ps = strrchr(ps, '/');
      if (ps)
        ps++;
      else
        ps = path;
      ARRAY_ADD(&args, ps);
    }
    ps = NULL;
    i++;
  }
 
#ifdef USE_NNTP
  if (!OptNewsSend)
  {
#endif
    /* If $sendmail contained a "--", we save the recipients to append to
     * args after other possible options added below. */
    if (ps)
    {
      ps = NULL;
      while ((ps = strtok(ps, " ")))
      {
        ARRAY_ADD(&extra_args, ps);
        ps = NULL;
      }
    }
 
    const bool c_use_8bit_mime = cs_subset_bool(sub, "use_8bit_mime");
    if (eightbit && c_use_8bit_mime)
      ARRAY_ADD(&args, "-B8BITMIME");
 
    const bool c_use_envelope_from = cs_subset_bool(sub, "use_envelope_from");
    if (c_use_envelope_from)
    {
      const struct Address *c_envelope_from_address = cs_subset_address(sub, "envelope_from_address");
      if (c_envelope_from_address)
      {
        ARRAY_ADD(&args, "-f");
        add_args_one(&args, c_envelope_from_address);
      }
      else if (!TAILQ_EMPTY(from) && !TAILQ_NEXT(TAILQ_FIRST(from), entries))
      {
        ARRAY_ADD(&args, "-f");
        add_args(&args, from);
      }
    }
 
    const char *const c_dsn_notify = cs_subset_string(sub, "dsn_notify");
    if (c_dsn_notify)
    {
      ARRAY_ADD(&args, "-N");
      ARRAY_ADD(&args, c_dsn_notify);
    }
 
    const char *const c_dsn_return = cs_subset_string(sub, "dsn_return");
    if (c_dsn_return)
    {
      ARRAY_ADD(&args, "-R");
      ARRAY_ADD(&args, c_dsn_return);
    }
    ARRAY_ADD(&args, "--");
    const char **e = NULL;
    ARRAY_FOREACH(e, &extra_args)
    {
      ARRAY_ADD(&args, *e);
    }
    add_args(&args, to);
    add_args(&args, cc);
    add_args(&args, bcc);
#ifdef USE_NNTP
  }
#endif
 
  ARRAY_ADD(&args, NULL);
 
  const short c_sendmail_wait = cs_subset_number(sub, "sendmail_wait");
  i = send_msg(path, &args, msg, OptNoCurses ? NULL : &childout, c_sendmail_wait);
 
  /* Some user's $sendmail command uses gpg for password decryption,
   * and is set up to prompt using ncurses pinentry.  If we
   * mutt_endwin() it leaves other users staring at a blank screen.
   * So instead, just force a hard redraw on the next refresh. */
  if (!OptNoCurses)
  {
    mutt_need_hard_redraw();
  }
 
  if (i != (EX_OK & 0xff))
  {
    if (i != S_BKG)
    {
      const char *e = mutt_str_sysexit(i);
      mutt_error(_("Error sending message, child exited %d (%s)"), i, NONULL(e));
      if (childout)
      {
        struct stat st = { 0 };
 
        if ((stat(childout, &st) == 0) && (st.st_size > 0))
        {
          struct PagerData pdata = { 0 };
          struct PagerView pview = { &pdata };
 
          pdata.fname = childout;
 
          pview.banner = _("Output of the delivery process");
          pview.flags = MUTT_PAGER_NO_FLAGS;
          pview.mode = PAGER_MODE_OTHER;
 
          mutt_do_pager(&pview, NULL);
        }
      }
    }
  }
  else if (childout)
  {
    unlink(childout);
  }
 
  FREE(&childout);
  FREE(&path);
  FREE(&s);
  ARRAY_FREE(&args);
  ARRAY_FREE(&extra_args);
 
  if (i == (EX_OK & 0xff))
    i = 0;
  else if (i == S_BKG)
    i = 1;
  else
    i = -1;
  return i;
}

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Variable Documentation

environ

char** environ

extern

SigAlrm

SIG_ATOMIC_VOLATILE_T SigAlrm

static

true after SIGALRM is received

Definition at line 64 of file sendmail.c.