alias.c File Reference

Representation of a single alias to an email address. More...

#include "config.h"
#include <pwd.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
#include <wctype.h>
#include "mutt/lib.h"
#include "address/lib.h"
#include "config/lib.h"
#include "email/lib.h"
#include "core/lib.h"
#include "gui/lib.h"
#include "mutt.h"
#include "alias.h"
#include "lib.h"
#include "browser/lib.h"
#include "editor/lib.h"
#include "history/lib.h"
#include "question/lib.h"
#include "send/lib.h"
#include "alternates.h"
#include "globals.h"
#include "maillist.h"
#include "muttlib.h"
#include "reverse.h"

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Functions
static void	write_safe_address (FILE *fp, const char *s)
	Defang malicious email addresses.
static void	expand_aliases_r (struct AddressList *al, struct ListHead *expn)
	Expand aliases, recursively.
static void	recode_buf (struct Buffer *buf)
	Convert some text between two character sets.
static int	check_alias_name (const char *s, struct Buffer *dest)
	Sanity-check an alias name.
static bool	string_is_address (const char *str, const char *user, const char *domain)
	Does an email address match a user and domain?
struct AddressList *	alias_lookup (const char *name)
	Find an Alias.
void	mutt_expand_aliases (struct AddressList *al)
	Expand aliases in a List of Addresses.
void	mutt_expand_aliases_env (struct Envelope *env)
	Expand aliases in all the fields of an Envelope.
struct AddressList *	mutt_get_address (struct Envelope *env, const char **prefix)
	Get an Address from an Envelope.
void	alias_create (struct AddressList *al, const struct ConfigSubset *sub)
	Create a new Alias from an Address.
bool	mutt_addr_is_user (const struct Address *addr)
	Does the address belong to the user.
struct Alias *	alias_new (void)
	Create a new Alias.
void	alias_free (struct Alias **ptr)
	Free an Alias.
void	aliaslist_clear (struct AliasList *al)
	Empty a List of Aliases.
void	alias_init (void)
	Set up the Alias globals.
void	alias_cleanup (void)
	Clean up the Alias globals.

Variables
struct AliasList	Aliases = TAILQ_HEAD_INITIALIZER(Aliases)
	List of all the user's email aliases.

Detailed Description

Representation of a single alias to an email address.

Authors

• Richard Russon
• Pietro Cerutti
• Federico Kircheis
• Anna Figueiredo Gomes
• Dennis Schön

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 alias.c.

Function Documentation

write_safe_address()

static void write_safe_address ( FILE *  fp, const char *  s  )

static

Defang malicious email addresses.

Parameters

fp	File to write to
s	Email address to defang

if someone has an address like From: John /bin/rm -f ~ Doe john..nosp@m.doe@.nosp@m.examp.nosp@m.le.c.nosp@m.om and the user creates an alias for this, NeoMutt could wind up executing the backticks because it writes aliases like alias me John /bin/rm -f ~ Doe john..nosp@m.doe@.nosp@m.examp.nosp@m.le.c.nosp@m.om To avoid this problem, use a backslash () to quote any backticks. We also need to quote backslashes as well, since you could defeat the above by doing From: John `/bin/rm -f ~` Doe john..nosp@m.doe@.nosp@m.examp.nosp@m.le.c.nosp@m.om since that would get aliased as alias me John \`/bin/rm -f ~\` Doe john..nosp@m.doe@.nosp@m.examp.nosp@m.le.c.nosp@m.om which still gets evaluated because the double backslash is not a quote.

Additionally, we need to quote ' and " characters, otherwise neomutt will interpret them on the wrong parsing step.

$ wants to be quoted since it may indicate the start of an environment variable.

Definition at line 88 of file alias.c.

{
  while (*s)
  {
    if ((*s == '\\') || (*s == '`') || (*s == '\'') || (*s == '"') || (*s == '$'))
      fputc('\\', fp);
    fputc(*s, fp);
    s++;
  }
}

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expand_aliases_r()

static void expand_aliases_r ( struct AddressList *  al, struct ListHead *  expn  )

static

Expand aliases, recursively.

Parameters

[in]	al	Address List
[out]	expn	Alias List

ListHead expn is used as temporary storage for already-expanded aliases.

Definition at line 106 of file alias.c.

{
  struct Address *a = TAILQ_FIRST(al);
  while (a)
  {
    if (!a->group && !a->personal && a->mailbox && !buf_find_char(a->mailbox, '@'))
    {
      struct AddressList *alias = alias_lookup(buf_string(a->mailbox));
      if (alias)
      {
        bool duplicate = false;
        struct ListNode *np = NULL;
        STAILQ_FOREACH(np, expn, entries)
        {
          if (mutt_str_equal(buf_string(a->mailbox), np->data)) /* alias already found */
          {
            mutt_debug(LL_DEBUG1, "loop in alias found for '%s'\n", buf_string(a->mailbox));
            duplicate = true;
            break;
          }
        }
 
        if (duplicate)
        {
          // We've already seen this alias, so drop it
          struct Address *next = TAILQ_NEXT(a, entries);
          TAILQ_REMOVE(al, a, entries);
          mutt_addr_free(&a);
          a = next;
          continue;
        }
 
        // Keep a list of aliases that we've already seen
        mutt_list_insert_head(expn, buf_strdup(a->mailbox));
 
        /* The alias may expand to several addresses,
         * some of which may themselves be aliases.
         * Create a copy and recursively expand any aliases within. */
        struct AddressList copy = TAILQ_HEAD_INITIALIZER(copy);
        mutt_addrlist_copy(&copy, alias, false);
        expand_aliases_r(&copy, expn);
 
        /* Next, move the expanded addresses
         * from the copy into the original list (before the alias) */
        struct Address *a2 = NULL, *tmp = NULL;
        TAILQ_FOREACH_SAFE(a2, &copy, entries, tmp)
        {
          TAILQ_INSERT_BEFORE(a, a2, entries);
        }
        a = TAILQ_PREV(a, AddressList, entries);
        // Finally, remove the alias itself
        struct Address *next = TAILQ_NEXT(a, entries);
        TAILQ_REMOVE(al, next, entries);
        mutt_addr_free(&next);
      }
      else
      {
        struct passwd *pw = getpwnam(buf_string(a->mailbox));
        if (pw)
        {
          char namebuf[256] = { 0 };
 
          mutt_gecos_name(namebuf, sizeof(namebuf), pw);
          a->personal = buf_new(namebuf);
        }
      }
    }
    a = TAILQ_NEXT(a, entries);
  }
 
  const char *fqdn = NULL;
  const bool c_use_domain = cs_subset_bool(NeoMutt->sub, "use_domain");
  if (c_use_domain && (fqdn = mutt_fqdn(true, NeoMutt->sub)))
  {
    /* now qualify all local addresses */
    mutt_addrlist_qualify(al, fqdn);
  }
}

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recode_buf()

static void recode_buf ( struct Buffer *  buf )

static

Convert some text between two character sets.

Parameters

buf	Buffer to convert

The 'from' charset is controlled by the 'charset' config variable. The 'to' charset is controlled by the 'config_charset' config variable.

Definition at line 192 of file alias.c.

{
  const char *const c_config_charset = cs_subset_string(NeoMutt->sub, "config_charset");
  if (!c_config_charset || !cc_charset())
    return;
 
  char *s = buf_strdup(buf);
  if (!s)
    return;
  if (mutt_ch_convert_string(&s, cc_charset(), c_config_charset, MUTT_ICONV_NO_FLAGS) == 0)
    buf_strcpy(buf, s);
  FREE(&s);
}

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check_alias_name()

static int check_alias_name ( const char *  s, struct Buffer *  dest  )

static

Sanity-check an alias name.

Parameters

s	Alias to check
dest	Buffer for the result

Return values

0	Success
-1	Error

Only characters which are non-special to both the RFC822 and the neomutt configuration parser are permitted.

Definition at line 216 of file alias.c.

{
  wchar_t wc = 0;
  mbstate_t mbstate = { 0 };
  size_t l;
  int rc = 0;
  bool dry = !dest; // Dry run
 
  if (!dry)
    buf_reset(dest);
  for (; s && *s && (l = mbrtowc(&wc, s, MB_CUR_MAX, &mbstate)) != 0; s += l)
  {
    bool bad = (l == ICONV_ILLEGAL_SEQ) || (l == ICONV_BUF_TOO_SMALL); /* conversion error */
    if (l == 1)
      bad = bad || (!strchr("-_+=.", *s) && !iswalnum(wc));
    else
      bad = bad || !iswalnum(wc);
    if (bad)
    {
      if (dry)
        return -1;
      if (l == ICONV_ILLEGAL_SEQ)
        memset(&mbstate, 0, sizeof(mbstate_t));
      buf_addch(dest, '_');
      rc = -1;
    }
    else if (!dry)
    {
      buf_addstr_n(dest, s, l);
    }
  }
 
  return rc;
}

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string_is_address()

static bool string_is_address ( const char *  str, const char *  user, const char *  domain  )

static

Does an email address match a user and domain?

Parameters

str	Address string to test
user	User name
domain	Domain name

Return values

true	They match

Definition at line 258 of file alias.c.

{
  char buf[1024] = { 0 };
 
  snprintf(buf, sizeof(buf), "%s@%s", NONULL(user), NONULL(domain));
  if (mutt_istr_equal(str, buf))
    return true;
 
  return false;
}

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alias_lookup()

struct AddressList * alias_lookup

(

const char *

name

)

Find an Alias.

Parameters

name	Alias name to find

Return values

ptr	Address for the Alias
NULL	No such Alias

Note

The search is case-insensitive

Definition at line 277 of file alias.c.

{
  struct Alias *a = NULL;
 
  TAILQ_FOREACH(a, &Aliases, entries)
  {
    if (mutt_istr_equal(name, a->name))
      return &a->addr;
  }
  return NULL;
}

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mutt_expand_aliases()

void mutt_expand_aliases

(

struct AddressList *

al

)

Expand aliases in a List of Addresses.

Parameters

al	AddressList

Duplicate addresses are dropped

Definition at line 295 of file alias.c.

{
  // previously expanded aliases to avoid loops
  struct ListHead expn = STAILQ_HEAD_INITIALIZER(expn);
 
  expand_aliases_r(al, &expn);
  mutt_list_free(&expn);
  mutt_addrlist_dedupe(al);
}

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mutt_expand_aliases_env()

void mutt_expand_aliases_env

(

struct Envelope *

env

)

Expand aliases in all the fields of an Envelope.

Parameters

env	Envelope to expand

Definition at line 309 of file alias.c.

{
  mutt_expand_aliases(&env->from);
  mutt_expand_aliases(&env->to);
  mutt_expand_aliases(&env->cc);
  mutt_expand_aliases(&env->bcc);
  mutt_expand_aliases(&env->reply_to);
  mutt_expand_aliases(&env->mail_followup_to);
}

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mutt_get_address()

struct AddressList * mutt_get_address	(	struct Envelope *	env,
		const char **	prefix
	)

Get an Address from an Envelope.

Parameters

[in]	env	Envelope to examine
[out]	prefix	Prefix for the Address, e.g. "To:"

Return values

ptr	AddressList in the Envelope

Note

The caller must NOT free the returned AddressList

Definition at line 327 of file alias.c.

{
  struct AddressList *al = NULL;
  const char *pfx = NULL;
 
  if (mutt_addr_is_user(TAILQ_FIRST(&env->from)))
  {
    if (!TAILQ_EMPTY(&env->to) && !mutt_is_mail_list(TAILQ_FIRST(&env->to)))
    {
      pfx = "To";
      al = &env->to;
    }
    else
    {
      pfx = "Cc";
      al = &env->cc;
    }
  }
  else if (!TAILQ_EMPTY(&env->reply_to) && !mutt_is_mail_list(TAILQ_FIRST(&env->reply_to)))
  {
    pfx = "Reply-To";
    al = &env->reply_to;
  }
  else
  {
    al = &env->from;
    pfx = "From";
  }
 
  if (prefix)
    *prefix = pfx;
 
  return al;
}

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alias_create()

void alias_create	(	struct AddressList *	al,
		const struct ConfigSubset *	sub
	)

Create a new Alias from an Address.

Parameters

al	Address to use
sub	Config items

Definition at line 367 of file alias.c.

{
  struct Buffer *buf = buf_pool_get();
  struct Buffer *fixed = buf_pool_get();
  struct Buffer *prompt = NULL;
  struct Buffer *tmp = buf_pool_get();
 
  struct Address *addr = NULL;
  char *pc = NULL;
  char *err = NULL;
  FILE *fp_alias = NULL;
 
  if (al)
  {
    addr = TAILQ_FIRST(al);
    if (addr && addr->mailbox)
    {
      buf_copy(tmp, addr->mailbox);
      pc = strchr(buf_string(tmp), '@');
      if (pc)
        *pc = '\0';
    }
  }
 
  /* Don't suggest a bad alias name in the event of a strange local part. */
  check_alias_name(buf_string(tmp), buf);
 
retry_name:
  /* L10N: prompt to add a new alias */
  if ((mw_get_field(_("Alias as: "), buf, MUTT_COMP_NO_FLAGS, HC_OTHER, NULL, NULL) != 0) ||
      buf_is_empty(buf))
  {
    goto done;
  }
 
  /* check to see if the user already has an alias defined */
  if (alias_lookup(buf_string(buf)))
  {
    mutt_error(_("You already have an alias defined with that name"));
    goto done;
  }
 
  if (check_alias_name(buf_string(buf), fixed))
  {
    switch (query_yesorno(_("Warning: This alias name may not work.  Fix it?"), MUTT_YES))
    {
      case MUTT_YES:
        buf_copy(buf, fixed);
        goto retry_name;
      case MUTT_ABORT:
        goto done;
      default:; // do nothing
    }
  }
 
  struct Alias *alias = alias_new();
  alias->name = buf_strdup(buf);
 
  mutt_addrlist_to_local(al);
 
  if (addr && addr->mailbox)
    buf_copy(buf, addr->mailbox);
  else
    buf_reset(buf);
 
  mutt_addrlist_to_intl(al, NULL);
 
  do
  {
    if ((mw_get_field(_("Address: "), buf, MUTT_COMP_NO_FLAGS, HC_OTHER, NULL, NULL) != 0) ||
        buf_is_empty(buf))
    {
      alias_free(&alias);
      goto done;
    }
 
    mutt_addrlist_parse(&alias->addr, buf_string(buf));
    if (TAILQ_EMPTY(&alias->addr))
      mutt_beep(false);
    if (mutt_addrlist_to_intl(&alias->addr, &err))
    {
      mutt_error(_("Bad IDN: '%s'"), err);
      FREE(&err);
      continue;
    }
  } while (TAILQ_EMPTY(&alias->addr));
 
  if (addr && addr->personal && !mutt_is_mail_list(addr))
    buf_copy(buf, addr->personal);
  else
    buf_reset(buf);
 
  if (mw_get_field(_("Personal name: "), buf, MUTT_COMP_NO_FLAGS, HC_OTHER, NULL, NULL) != 0)
  {
    alias_free(&alias);
    goto done;
  }
 
  TAILQ_FIRST(&alias->addr)->personal = buf_new(buf_string(buf));
 
  buf_reset(buf);
  if (mw_get_field(_("Comment: "), buf, MUTT_COMP_NO_FLAGS, HC_OTHER, NULL, NULL) == 0)
  {
    mutt_str_replace(&alias->comment, buf_string(buf));
  }
 
  buf_reset(buf);
  if (mw_get_field(_("Tags (comma-separated): "), buf, MUTT_COMP_NO_FLAGS,
                   HC_OTHER, NULL, NULL) == 0)
  {
    parse_alias_tags(buf_string(buf), &alias->tags);
  }
 
  buf_reset(buf);
  mutt_addrlist_write(&alias->addr, buf, true);
  prompt = buf_pool_get();
 
  buf_printf(prompt, "alias %s %s", alias->name, buf_string(buf));
 
  bool has_tags = STAILQ_FIRST(&alias->tags);
 
  if (alias->comment || has_tags)
    buf_addstr(prompt, " #");
 
  if (alias->comment)
    buf_add_printf(prompt, " %s", alias->comment);
 
  if (has_tags)
  {
    if (STAILQ_FIRST(&alias->tags))
    {
      buf_addstr(prompt, " tags:");
      alias_tags_to_buffer(&alias->tags, prompt);
    }
  }
 
  buf_add_printf(prompt, "\n%s", _("Accept?"));
 
  if (query_yesorno(buf_string(prompt), MUTT_YES) != MUTT_YES)
  {
    alias_free(&alias);
    goto done;
  }
 
  alias_reverse_add(alias);
  TAILQ_INSERT_TAIL(&Aliases, alias, entries);
 
  const char *const c_alias_file = cs_subset_path(sub, "alias_file");
  buf_strcpy(buf, c_alias_file);
 
  struct FileCompletionData cdata = { false, NULL, NULL, NULL };
  if (mw_get_field(_("Save to file: "), buf, MUTT_COMP_CLEAR, HC_FILE,
                   &CompleteFileOps, &cdata) != 0)
  {
    goto done;
  }
  buf_expand_path(buf);
  fp_alias = mutt_file_fopen(buf_string(buf), "a+");
  if (!fp_alias)
  {
    mutt_perror("%s", buf_string(buf));
    goto done;
  }
 
  /* terminate existing file with \n if necessary */
  if (ftell(fp_alias) > 0)
  {
    if (!mutt_file_seek(fp_alias, -1, SEEK_CUR))
    {
      goto done;
    }
    if (fread(buf->data, 1, 1, fp_alias) != 1)
    {
      mutt_perror(_("Error reading alias file"));
      goto done;
    }
    if (!mutt_file_seek(fp_alias, 0, SEEK_END))
    {
      goto done;
    }
    if (buf->data[0] != '\n')
      fputc('\n', fp_alias);
  }
 
  if (check_alias_name(alias->name, NULL))
    buf_quote_filename(buf, alias->name, true);
  else
    buf_strcpy(buf, alias->name);
 
  recode_buf(buf);
  fprintf(fp_alias, "alias %s ", buf_string(buf));
  buf_reset(buf);
 
  mutt_addrlist_write(&alias->addr, buf, false);
  recode_buf(buf);
  write_safe_address(fp_alias, buf_string(buf));
  if (alias->comment)
    fprintf(fp_alias, " # %s", alias->comment);
  if (STAILQ_FIRST(&alias->tags))
  {
    fprintf(fp_alias, " tags:");
 
    struct Tag *tag = NULL;
    STAILQ_FOREACH(tag, &alias->tags, entries)
    {
      fprintf(fp_alias, "%s", tag->name);
      if (STAILQ_NEXT(tag, entries))
        fprintf(fp_alias, ",");
    }
  }
  fputc('\n', fp_alias);
  if (mutt_file_fsync_close(&fp_alias) != 0)
    mutt_perror(_("Trouble adding alias"));
  else
    mutt_message(_("Alias added"));
 
done:
  mutt_file_fclose(&fp_alias);
  buf_pool_release(&buf);
  buf_pool_release(&fixed);
  buf_pool_release(&prompt);
  buf_pool_release(&tmp);
}

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mutt_addr_is_user()

bool mutt_addr_is_user

(

const struct Address *

addr

)

Does the address belong to the user.

Parameters

addr	Address to check

Return values

true	The given address belongs to the user

Definition at line 596 of file alias.c.

{
  if (!addr)
  {
    mutt_debug(LL_DEBUG5, "no, NULL address\n");
    return false;
  }
  if (!addr->mailbox)
  {
    mutt_debug(LL_DEBUG5, "no, no mailbox\n");
    return false;
  }
 
  if (mutt_istr_equal(buf_string(addr->mailbox), NeoMutt->username))
  {
    mutt_debug(LL_DEBUG5, "#1 yes, %s = %s\n", buf_string(addr->mailbox),
               NeoMutt->username);
    return true;
  }
  if (string_is_address(buf_string(addr->mailbox), NeoMutt->username, ShortHostname))
  {
    mutt_debug(LL_DEBUG5, "#2 yes, %s = %s @ %s\n", buf_string(addr->mailbox),
               NeoMutt->username, ShortHostname);
    return true;
  }
  const char *fqdn = mutt_fqdn(false, NeoMutt->sub);
  if (string_is_address(buf_string(addr->mailbox), NeoMutt->username, fqdn))
  {
    mutt_debug(LL_DEBUG5, "#3 yes, %s = %s @ %s\n", buf_string(addr->mailbox),
               NeoMutt->username, NONULL(fqdn));
    return true;
  }
  fqdn = mutt_fqdn(true, NeoMutt->sub);
  if (string_is_address(buf_string(addr->mailbox), NeoMutt->username, fqdn))
  {
    mutt_debug(LL_DEBUG5, "#4 yes, %s = %s @ %s\n", buf_string(addr->mailbox),
               NeoMutt->username, NONULL(fqdn));
    return true;
  }
 
  const struct Address *c_from = cs_subset_address(NeoMutt->sub, "from");
  if (c_from && mutt_istr_equal(buf_string(c_from->mailbox), buf_string(addr->mailbox)))
  {
    mutt_debug(LL_DEBUG5, "#5 yes, %s = %s\n", buf_string(addr->mailbox),
               buf_string(c_from->mailbox));
    return true;
  }
 
  if (mutt_alternates_match(buf_string(addr->mailbox)))
    return true;
 
  mutt_debug(LL_DEBUG5, "no, all failed\n");
  return false;
}

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alias_new()

struct Alias * alias_new

(

void

)

Create a new Alias.

Return values

ptr	Newly allocated Alias

Free the result with alias_free()

Definition at line 657 of file alias.c.

{
  struct Alias *a = MUTT_MEM_CALLOC(1, struct Alias);
  TAILQ_INIT(&a->addr);
  STAILQ_INIT(&a->tags);
  return a;
}

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alias_free()

void alias_free

(

struct Alias **

ptr

)

Free an Alias.

Parameters

[out]

ptr

Alias to free

Definition at line 669 of file alias.c.

{
  if (!ptr || !*ptr)
    return;
 
  struct Alias *alias = *ptr;
 
  mutt_debug(LL_NOTIFY, "NT_ALIAS_DELETE: %s\n", alias->name);
  struct EventAlias ev_a = { alias };
  notify_send(NeoMutt->notify, NT_ALIAS, NT_ALIAS_DELETE, &ev_a);
 
  FREE(&alias->name);
  FREE(&alias->comment);
  driver_tags_free(&alias->tags);
  mutt_addrlist_clear(&(alias->addr));
 
  FREE(ptr);
}

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aliaslist_clear()

void aliaslist_clear

(

struct AliasList *

al

)

Empty a List of Aliases.

Parameters

al	AliasList to empty

Each Alias will be freed and the AliasList will be left empty.

Definition at line 694 of file alias.c.

{
  if (!al)
    return;
 
  struct Alias *np = NULL, *tmp = NULL;
  TAILQ_FOREACH_SAFE(np, al, entries, tmp)
  {
    TAILQ_REMOVE(al, np, entries);
    alias_free(&np);
  }
  TAILQ_INIT(al);
}

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alias_init()

void alias_init

(

void

)

Set up the Alias globals.

Definition at line 711 of file alias.c.

{
  alias_reverse_init();
}

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alias_cleanup()

void alias_cleanup

(

void

)

Clean up the Alias globals.

Definition at line 719 of file alias.c.

{
  struct Alias *np = NULL;
  TAILQ_FOREACH(np, &Aliases, entries)
  {
    alias_reverse_delete(np);
  }
  aliaslist_clear(&Aliases);
  alias_reverse_shutdown();
}

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Variable Documentation

Aliases

struct AliasList Aliases = TAILQ_HEAD_INITIALIZER(Aliases)

List of all the user's email aliases.

Definition at line 62 of file alias.c.