TOK822 *tok822_scan_limit(const char *str, TOK822 **tailp, int tok_count_limit)
{
TOK822 *head = 0;
TOK822 *tail = 0;
TOK822 *tp;
int ch;
int tok_count = 0;
/*
* XXX 2822 new feature: Section 4.1 allows "." to appear in a phrase (to
* allow for forms such as: Johnny B. Goode <*****@*****.**>. I cannot
* handle that at the tokenizer level - it is not context sensitive. And
* to fix this at the parser level requires radical changes to preserve
* white space as part of the token stream. Thanks a lot, people.
*/
while ((ch = *(const unsigned char *) str++) != 0) {
if (IS_SPACE_TAB_CR_LF(ch))
continue;
if (ch == '(') {
tp = tok822_alloc(TOK822_COMMENT, (char *) 0);
str = tok822_comment(tp, str);
} else if (ch == '[') {
tp = tok822_alloc(TOK822_DOMLIT, (char *) 0);
COLLECT_SKIP_LAST(tp, str, ch, ch != ']');
} else if (ch == '"') {
tp = tok822_alloc(TOK822_QSTRING, (char *) 0);
COLLECT_SKIP_LAST(tp, str, ch, ch != '"');
} else if (ch != '\\' && strchr(tok822_opchar, ch)) {
tp = tok822_alloc(ch, (char *) 0);
} else {
tp = tok822_alloc(TOK822_ATOM, (char *) 0);
str -= 1; /* \ may be first */
COLLECT(tp, str, ch, !IS_SPACE_TAB_CR_LF(ch) && !strchr(tok822_opchar, ch));
tok822_quote_atom(tp);
}
if (head == 0) {
head = tail = tp;
while (tail->next)
tail = tail->next;
} else {
tail = tok822_append(tail, tp);
}
if (tok_count_limit > 0 && ++tok_count >= tok_count_limit)
break;
}
if (tailp)
*tailp = tail;
return (head);
}
TOK822 *tok822_scan_addr(const char *addr)
{
TOK822 *tree = tok822_alloc(TOK822_ADDR, (char *) 0);
tree->head = tok822_scan(addr, &tree->tail);
return (tree);
}
static TOK822 *tok822_group(int group_type, TOK822 *left, TOK822 *right, int sync_type)
{
TOK822 *group;
TOK822 *sync;
TOK822 *first;
/*
* Cluster the tokens between left and right under their own parse tree
* node. Optionally insert a resync token.
*/
if (left != right && (first = left->next) != right) {
tok822_cut_before(right);
tok822_cut_before(first);
group = tok822_alloc(group_type, (char *) 0);
tok822_sub_append(group, first);
tok822_append(left, group);
tok822_append(group, right);
if (sync_type) {
sync = tok822_alloc(sync_type, (char *) 0);
tok822_append(left, sync);
}
}
return (left);
}
TOK822 *tok822_parse_limit(const char *str, int tok_count_limit)
{
TOK822 *head;
TOK822 *tail;
TOK822 *right;
TOK822 *first_token;
TOK822 *last_token;
TOK822 *tp;
int state;
/*
* First, tokenize the string, from left to right. We are not allowed to
* throw away any information that we do not understand. With a flat
* token list that contains all tokens, we can always convert back to
* string form.
*/
if ((first_token = tok822_scan_limit(str, &last_token, tok_count_limit)) == 0)
return (0);
/*
* For convenience, sandwich the token list between two sentinel tokens.
*/
#define GLUE(left,rite) { left->next = rite; rite->prev = left; }
head = tok822_alloc(0, (char *) 0);
GLUE(head, first_token);
tail = tok822_alloc(0, (char *) 0);
GLUE(last_token, tail);
/*
* Next step is to transform the token list into a parse tree. This is
* done most conveniently from right to left. If there is something that
* we do not understand, just leave it alone, don't throw it away. The
* address information that we're looking for sits in-between the current
* node (tp) and the one called right. Add missing commas on the fly.
*/
state = DO_WORD;
right = tail;
tp = tail->prev;
while (tp->type) {
if (tp->type == TOK822_COMMENT) { /* move comment to the side */
MOVE_COMMENT_AND_CONTINUE(tp, right);
} else if (tp->type == ';') { /* rh side of named group */
right = tok822_group(TOK822_ADDR, tp, right, ADD_COMMA);
state = DO_GROUP | DO_WORD;
} else if (tp->type == ':' && (state & DO_GROUP) != 0) {
tp->type = TOK822_STARTGRP;
(void) tok822_group(TOK822_ADDR, tp, right, NO_MISSING_COMMA);
SKIP(tp, tp->type != ',');
right = tp;
continue;
} else if (tp->type == '>') { /* rh side of <route> */
right = tok822_group(TOK822_ADDR, tp, right, ADD_COMMA);
SKIP_MOVE_COMMENT(tp, tp->type != '<', right);
(void) tok822_group(TOK822_ADDR, tp, right, NO_MISSING_COMMA);
SKIP(tp, tp->type > 0xff || strchr(">;,:", tp->type) == 0);
right = tp;
state |= DO_WORD;
continue;
} else if (tp->type == TOK822_ATOM || tp->type == TOK822_QSTRING
|| tp->type == TOK822_DOMLIT) {
if ((state & DO_WORD) == 0)
right = tok822_group(TOK822_ADDR, tp, right, ADD_COMMA)->next;
state &= ~DO_WORD;
} else if (tp->type == ',') {
right = tok822_group(TOK822_ADDR, tp, right, NO_MISSING_COMMA);
state |= DO_WORD;
} else {
state |= DO_WORD;
}
tp = tp->prev;
}
(void) tok822_group(TOK822_ADDR, tp, right, NO_MISSING_COMMA);
/*
* Discard the sentinel tokens on the left and right extremes. Properly
* terminate the resulting list.
*/
tp = (head->next != tail ? head->next : 0);
tok822_cut_before(head->next);
tok822_free(head);
tok822_cut_before(tail);
tok822_free(tail);
return (tp);
}
void rewrite_tree(RWR_CONTEXT *context, TOK822 *tree)
{
TOK822 *colon;
TOK822 *domain;
TOK822 *bang;
TOK822 *local;
VSTRING *vstringval;
/*
* XXX If you change this module, quote_822_local.c, or tok822_parse.c,
* be sure to re-run the tests under "make rewrite_clnt_test" and "make
* resolve_clnt_test" in the global directory.
*/
/*
* Sanity check.
*/
if (tree->head == 0)
msg_panic("rewrite_tree: empty tree");
/*
* An empty address is a special case.
*/
if (tree->head == tree->tail
&& tree->tail->type == TOK822_QSTRING
&& VSTRING_LEN(tree->tail->vstr) == 0)
return;
/*
* Treat a lone @ as if it were an empty address.
*/
if (tree->head == tree->tail
&& tree->tail->type == '@') {
tok822_free_tree(tok822_sub_keep_before(tree, tree->tail));
tok822_sub_append(tree, tok822_alloc(TOK822_QSTRING, ""));
return;
}
/*
* Strip source route.
*/
if (tree->head->type == '@'
&& (colon = tok822_find_type(tree->head, ':')) != 0
&& colon != tree->tail)
tok822_free_tree(tok822_sub_keep_after(tree, colon));
/*
* Optionally, transform address forms without @.
*/
if ((domain = tok822_rfind_type(tree->tail, '@')) == 0) {
/*
* Swap domain!user to user@domain.
*/
if (var_swap_bangpath != 0
&& (bang = tok822_find_type(tree->head, '!')) != 0) {
tok822_sub_keep_before(tree, bang);
local = tok822_cut_after(bang);
tok822_free(bang);
tok822_sub_prepend(tree, tok822_alloc('@', (char *) 0));
if (local)
tok822_sub_prepend(tree, local);
}
/*
* Promote user%domain to user@domain.
*/
else if (var_percent_hack != 0
&& (domain = tok822_rfind_type(tree->tail, '%')) != 0) {
domain->type = '@';
}
/*
* Append missing @origin
*/
else if (var_append_at_myorigin != 0
&& REW_PARAM_VALUE(context->origin) != 0
&& REW_PARAM_VALUE(context->origin)[0] != 0) {
domain = tok822_sub_append(tree, tok822_alloc('@', (char *) 0));
tok822_sub_append(tree, tok822_scan(REW_PARAM_VALUE(context->origin),
(TOK822 **) 0));
}
}
/*
* Append missing .domain, but leave broken forms ending in @ alone. This
* merely makes diagnostics more accurate by leaving bogus addresses
* alone.
*
* Backwards-compatibility warning: warn for "user@localhost" when there is
* no "localhost" in mydestination or in any other address class with an
* explicit domain list.
*/
if (var_append_dot_mydomain != 0
&& REW_PARAM_VALUE(context->domain) != 0
&& REW_PARAM_VALUE(context->domain)[0] != 0
&& (domain = tok822_rfind_type(tree->tail, '@')) != 0
&& domain != tree->tail
&& tok822_find_type(domain, TOK822_DOMLIT) == 0
&& tok822_find_type(domain, '.') == 0) {
if (warn_compat_break_app_dot_mydomain
&& (vstringval = domain->next->vstr) != 0) {
if (strcasecmp(vstring_str(vstringval), "localhost") != 0) {
msg_info("using backwards-compatible default setting "
VAR_APP_DOT_MYDOMAIN "=yes to rewrite \"%s\" to "
"\"%s.%s\"", vstring_str(vstringval),
vstring_str(vstringval), var_mydomain);
} else if (resolve_class("localhost") == RESOLVE_CLASS_DEFAULT) {
msg_info("using backwards-compatible default setting "
VAR_APP_DOT_MYDOMAIN "=yes to rewrite \"%s\" to "
"\"%s.%s\"; please add \"localhost\" to "
"mydestination or other address class",
vstring_str(vstringval), vstring_str(vstringval),
var_mydomain);
}
}
tok822_sub_append(tree, tok822_alloc('.', (char *) 0));
tok822_sub_append(tree, tok822_scan(REW_PARAM_VALUE(context->domain),
(TOK822 **) 0));
}
/*
* Strip trailing dot at end of domain, but not dot-dot or @-dot. This
* merely makes diagnostics more accurate by leaving bogus addresses
* alone.
*/
if (tree->tail->type == '.'
&& tree->tail->prev
&& tree->tail->prev->type != '.'
&& tree->tail->prev->type != '@')
tok822_free_tree(tok822_sub_keep_before(tree, tree->tail));
}
static void resolve_addr(RES_CONTEXT *rp, char *addr,
VSTRING *channel, VSTRING *nexthop,
VSTRING *nextrcpt, int *flags)
{
char *myname = "resolve_addr";
VSTRING *addr_buf = vstring_alloc(100);
TOK822 *tree = 0;
TOK822 *saved_domain = 0;
TOK822 *domain = 0;
char *destination;
const char *blame = 0;
const char *rcpt_domain;
int addr_len;
int loop_count;
int loop_max;
char *local;
char *oper;
char *junk;
*flags = 0;
vstring_strcpy(channel, "CHANNEL NOT UPDATED");
vstring_strcpy(nexthop, "NEXTHOP NOT UPDATED");
vstring_strcpy(nextrcpt, "NEXTRCPT NOT UPDATED");
/*
* The address is in internalized (unquoted) form.
*
* In an ideal world we would parse the externalized address form as given
* to us by the sender.
*
* However, in the real world we have to look for routing characters like
* %@! in the address local-part, even when that information is quoted
* due to the presence of special characters or whitespace. Although
* technically incorrect, this is needed to stop user@domain@domain relay
* attempts when forwarding mail to a Sendmail MX host.
*
* This suggests that we parse the address in internalized (unquoted) form.
* Unfortunately, if we do that, the unparser generates incorrect white
* space between adjacent non-operator tokens. Example: ``first last''
* needs white space, but ``stuff[stuff]'' does not. This is is not a
* problem when unparsing the result from parsing externalized forms,
* because the parser/unparser were designed for valid externalized forms
* where ``stuff[stuff]'' does not happen.
*
* As a workaround we start with the quoted form and then dequote the
* local-part only where needed. This will do the right thing in most
* (but not all) cases.
*/
addr_len = strlen(addr);
quote_822_local(addr_buf, addr);
tree = tok822_scan_addr(vstring_str(addr_buf));
/*
* Let the optimizer replace multiple expansions of this macro by a GOTO
* to a single instance.
*/
#define FREE_MEMORY_AND_RETURN { \
if (saved_domain) \
tok822_free_tree(saved_domain); \
if(tree) \
tok822_free_tree(tree); \
if (addr_buf) \
vstring_free(addr_buf); \
return; \
}
/*
* Preliminary resolver: strip off all instances of the local domain.
* Terminate when no destination domain is left over, or when the
* destination domain is remote.
*
* XXX To whom it may concern. If you change the resolver loop below, or
* quote_822_local.c, or tok822_parse.c, be sure to re-run the tests
* under "make resolve_clnt_test" in the global directory.
*/
#define RESOLVE_LOCAL(domain) \
resolve_local(STR(tok822_internalize(addr_buf, domain, TOK822_STR_DEFL)))
dict_errno = 0;
for (loop_count = 0, loop_max = addr_len + 100; /* void */ ; loop_count++) {
/*
* Grr. resolve_local() table lookups may fail. It may be OK for
* local file lookup code to abort upon failure, but with
* network-based tables it is preferable to return an error
* indication to the requestor.
*/
if (dict_errno) {
*flags |= RESOLVE_FLAG_FAIL;
FREE_MEMORY_AND_RETURN;
}
/*
* XXX Should never happen, but if this happens with some
* pathological address, then that is not sufficient reason to
* disrupt the operation of an MTA.
*/
if (loop_count > loop_max) {
msg_warn("resolve_addr: <%s>: giving up after %d iterations",
addr, loop_count);
break;
}
/*
* Strip trailing dot at end of domain, but not dot-dot or at-dot.
* This merely makes diagnostics more accurate by leaving bogus
* addresses alone.
*/
if (tree->tail
&& tree->tail->type == '.'
&& tok822_rfind_type(tree->tail, '@') != 0
&& tree->tail->prev->type != '.'
&& tree->tail->prev->type != '@')
tok822_free_tree(tok822_sub_keep_before(tree, tree->tail));
/*
* Strip trailing @.
*/
if (var_resolve_nulldom
&& tree->tail
&& tree->tail->type == '@')
tok822_free_tree(tok822_sub_keep_before(tree, tree->tail));
/*
* Strip (and save) @domain if local.
*/
if ((domain = tok822_rfind_type(tree->tail, '@')) != 0) {
if (domain->next && RESOLVE_LOCAL(domain->next) == 0)
break;
tok822_sub_keep_before(tree, domain);
if (saved_domain)
tok822_free_tree(saved_domain);
saved_domain = domain;
domain = 0; /* safety for future change */
}
/*
* After stripping the local domain, if any, replace foo%bar by
* foo@bar, site!user by user@site, rewrite to canonical form, and
* retry.
*/
if (tok822_rfind_type(tree->tail, '@')
|| (var_swap_bangpath && tok822_rfind_type(tree->tail, '!'))
|| (var_percent_hack && tok822_rfind_type(tree->tail, '%'))) {
rewrite_tree(REWRITE_CANON, tree);
continue;
}
/*
* If the local-part is a quoted string, crack it open when we're
* permitted to do so and look for routing operators. This is
* technically incorrect, but is needed to stop relaying problems.
*
* XXX Do another feeble attempt to keep local-part info quoted.
*/
if (var_resolve_dequoted
&& tree->head && tree->head == tree->tail
&& tree->head->type == TOK822_QSTRING
&& ((oper = strrchr(local = STR(tree->head->vstr), '@')) != 0
|| (var_percent_hack && (oper = strrchr(local, '%')) != 0)
|| (var_swap_bangpath && (oper = strrchr(local, '!')) != 0))) {
if (*oper == '%')
*oper = '@';
tok822_internalize(addr_buf, tree->head, TOK822_STR_DEFL);
if (*oper == '@') {
junk = mystrdup(STR(addr_buf));
quote_822_local(addr_buf, junk);
myfree(junk);
}
tok822_free(tree->head);
tree->head = tok822_scan(STR(addr_buf), &tree->tail);
rewrite_tree(REWRITE_CANON, tree);
continue;
}
/*
* An empty local-part or an empty quoted string local-part becomes
* the local MAILER-DAEMON, for consistency with our own From:
* message headers.
*/
if (tree->head && tree->head == tree->tail
&& tree->head->type == TOK822_QSTRING
&& VSTRING_LEN(tree->head->vstr) == 0) {
tok822_free(tree->head);
tree->head = 0;
}
/* XXX must be localpart only, not user@domain form. */
if (tree->head == 0)
tree->head = tok822_scan(var_empty_addr, &tree->tail);
/*
* We're done. There are no domains left to strip off the address,
* and all null local-part information is sanitized.
*/
domain = 0;
break;
}
vstring_free(addr_buf);
addr_buf = 0;
/*
* Make sure the resolved envelope recipient has the user@domain form. If
* no domain was specified in the address, assume the local machine. See
* above for what happens with an empty address.
*/
if (domain == 0) {
if (saved_domain) {
tok822_sub_append(tree, saved_domain);
saved_domain = 0;
} else {
tok822_sub_append(tree, tok822_alloc('@', (char *) 0));
tok822_sub_append(tree, tok822_scan(var_myhostname, (TOK822 **) 0));
}
}
/*
* Transform the recipient address back to internal form.
*
* XXX This may produce incorrect results if we cracked open a quoted
* local-part with routing operators; see discussion above at the top of
* the big loop.
*/
tok822_internalize(nextrcpt, tree, TOK822_STR_DEFL);
rcpt_domain = strrchr(STR(nextrcpt), '@') + 1;
if (*rcpt_domain == '[' ? !valid_hostliteral(rcpt_domain, DONT_GRIPE) :
(!valid_hostname(rcpt_domain, DONT_GRIPE)
|| valid_hostaddr(rcpt_domain, DONT_GRIPE)))
*flags |= RESOLVE_FLAG_ERROR;
tok822_free_tree(tree);
tree = 0;
/*
* XXX Short-cut invalid address forms.
*/
if (*flags & RESOLVE_FLAG_ERROR) {
*flags |= RESOLVE_CLASS_DEFAULT;
FREE_MEMORY_AND_RETURN;
}
/*
* Recognize routing operators in the local-part, even when we do not
* recognize ! or % as valid routing operators locally. This is needed to
* prevent backup MX hosts from relaying third-party destinations through
* primary MX hosts, otherwise the backup host could end up on black
* lists. Ignore local swap_bangpath and percent_hack settings because we
* can't know how the next MX host is set up.
*/
if (strcmp(STR(nextrcpt) + strcspn(STR(nextrcpt), "@!%") + 1, rcpt_domain))
*flags |= RESOLVE_FLAG_ROUTED;
/*
* With local, virtual, relay, or other non-local destinations, give the
* highest precedence to transport associated nexthop information.
*
* Otherwise, with relay or other non-local destinations, the relayhost
* setting overrides the destination domain name.
*
* XXX Nag if the recipient domain is listed in multiple domain lists. The
* result is implementation defined, and may break when internals change.
*
* For now, we distinguish only a fixed number of address classes.
* Eventually this may become extensible, so that new classes can be
* configured with their own domain list, delivery transport, and
* recipient table.
*/
#define STREQ(x,y) (strcmp((x), (y)) == 0)
dict_errno = 0;
if (domain != 0) {
/*
* Virtual alias domain.
*/
if (virt_alias_doms
&& string_list_match(virt_alias_doms, rcpt_domain)) {
if (var_helpful_warnings) {
if (virt_mailbox_doms
&& string_list_match(virt_mailbox_doms, rcpt_domain))
msg_warn("do not list domain %s in BOTH %s and %s",
rcpt_domain, VAR_VIRT_ALIAS_DOMS,
VAR_VIRT_MAILBOX_DOMS);
if (relay_domains
&& domain_list_match(relay_domains, rcpt_domain))
msg_warn("do not list domain %s in BOTH %s and %s",
rcpt_domain, VAR_VIRT_ALIAS_DOMS,
VAR_RELAY_DOMAINS);
#if 0
if (strcasecmp(rcpt_domain, var_myorigin) == 0)
msg_warn("do not list $%s (%s) in %s",
VAR_MYORIGIN, var_myorigin, VAR_VIRT_ALIAS_DOMS);
#endif
}
vstring_strcpy(channel, MAIL_SERVICE_ERROR);
vstring_sprintf(nexthop, "User unknown%s",
var_show_unk_rcpt_table ?
" in virtual alias table" : "");
*flags |= RESOLVE_CLASS_ALIAS;
} else if (dict_errno != 0) {
msg_warn("%s lookup failure", VAR_VIRT_ALIAS_DOMS);
*flags |= RESOLVE_FLAG_FAIL;
FREE_MEMORY_AND_RETURN;
}
/*
* Virtual mailbox domain.
*/
else if (virt_mailbox_doms
&& string_list_match(virt_mailbox_doms, rcpt_domain)) {
if (var_helpful_warnings) {
if (relay_domains
&& domain_list_match(relay_domains, rcpt_domain))
msg_warn("do not list domain %s in BOTH %s and %s",
rcpt_domain, VAR_VIRT_MAILBOX_DOMS,
VAR_RELAY_DOMAINS);
}
vstring_strcpy(channel, RES_PARAM_VALUE(rp->virt_transport));
vstring_strcpy(nexthop, rcpt_domain);
blame = rp->virt_transport_name;
*flags |= RESOLVE_CLASS_VIRTUAL;
} else if (dict_errno != 0) {
msg_warn("%s lookup failure", VAR_VIRT_MAILBOX_DOMS);
*flags |= RESOLVE_FLAG_FAIL;
FREE_MEMORY_AND_RETURN;
} else {
/*
* Off-host relay destination.
*/
if (relay_domains
&& domain_list_match(relay_domains, rcpt_domain)) {
vstring_strcpy(channel, RES_PARAM_VALUE(rp->relay_transport));
blame = rp->relay_transport_name;
*flags |= RESOLVE_CLASS_RELAY;
} else if (dict_errno != 0) {
msg_warn("%s lookup failure", VAR_RELAY_DOMAINS);
*flags |= RESOLVE_FLAG_FAIL;
FREE_MEMORY_AND_RETURN;
}
/*
* Other off-host destination.
*/
else {
vstring_strcpy(channel, RES_PARAM_VALUE(rp->def_transport));
blame = rp->def_transport_name;
*flags |= RESOLVE_CLASS_DEFAULT;
}
/*
* With off-host delivery, relayhost overrides recipient domain.
*/
if (*RES_PARAM_VALUE(rp->relayhost))
vstring_strcpy(nexthop, RES_PARAM_VALUE(rp->relayhost));
else
vstring_strcpy(nexthop, rcpt_domain);
}
}
/*
* Local delivery.
*
* XXX Nag if the domain is listed in multiple domain lists. The effect is
* implementation defined, and may break when internals change.
*/
else {
if (var_helpful_warnings) {
if (virt_alias_doms
&& string_list_match(virt_alias_doms, rcpt_domain))
msg_warn("do not list domain %s in BOTH %s and %s",
rcpt_domain, VAR_MYDEST, VAR_VIRT_ALIAS_DOMS);
if (virt_mailbox_doms
&& string_list_match(virt_mailbox_doms, rcpt_domain))
msg_warn("do not list domain %s in BOTH %s and %s",
rcpt_domain, VAR_MYDEST, VAR_VIRT_MAILBOX_DOMS);
}
vstring_strcpy(channel, RES_PARAM_VALUE(rp->local_transport));
vstring_strcpy(nexthop, rcpt_domain);
blame = rp->local_transport_name;
*flags |= RESOLVE_CLASS_LOCAL;
}
/*
* An explicit main.cf transport:nexthop setting overrides the nexthop.
*
* XXX We depend on this mechanism to enforce per-recipient concurrencies
* for local recipients. With "local_transport = local:$myhostname" we
* force mail for any domain in $mydestination/${proxy,inet}_interfaces
* to share the same queue.
*/
if ((destination = split_at(STR(channel), ':')) != 0 && *destination)
vstring_strcpy(nexthop, destination);
/*
* Sanity checks.
*/
if (*STR(channel) == 0) {
if (blame == 0)
msg_panic("%s: null blame", myname);
msg_warn("file %s/%s: parameter %s: null transport is not allowed",
var_config_dir, MAIN_CONF_FILE, blame);
*flags |= RESOLVE_FLAG_FAIL;
FREE_MEMORY_AND_RETURN;
}
if (*STR(nexthop) == 0)
msg_panic("%s: null nexthop", myname);
/*
* The transport map can selectively override any transport and/or
* nexthop host info that is set up above. Unfortunately, the syntax for
* nexthop information is transport specific. We therefore need sane and
* intuitive semantics for transport map entries that specify a channel
* but no nexthop.
*
* With non-error transports, the initial nexthop information is the
* recipient domain. However, specific main.cf transport definitions may
* specify a transport-specific destination, such as a host + TCP socket,
* or the pathname of a UNIX-domain socket. With less precedence than
* main.cf transport definitions, a main.cf relayhost definition may also
* override nexthop information for off-host deliveries.
*
* With the error transport, the nexthop information is free text that
* specifies the reason for non-delivery.
*
* Because nexthop syntax is transport specific we reset the nexthop
* information to the recipient domain when the transport table specifies
* a transport without also specifying the nexthop information.
*
* Subtle note: reset nexthop even when the transport table does not change
* the transport. Otherwise it is hard to get rid of main.cf specified
* nexthop information.
*
* XXX Don't override the virtual alias class (error:User unknown) result.
*/
if (rp->transport_info && !(*flags & RESOLVE_CLASS_ALIAS)) {
if (transport_lookup(rp->transport_info, STR(nextrcpt),
rcpt_domain, channel, nexthop) == 0
&& dict_errno != 0) {
msg_warn("%s lookup failure", rp->transport_maps_name);
*flags |= RESOLVE_FLAG_FAIL;
FREE_MEMORY_AND_RETURN;
}
}
/*
* Bounce recipients that have moved, regardless of domain address class.
* We do this last, in anticipation of transport maps that can override
* the recipient address.
*
* The downside of not doing this in delivery agents is that this table has
* no effect on local alias expansion results. Such mail will have to
* make almost an entire iteration through the mail system.
*/
#define IGNORE_ADDR_EXTENSION ((char **) 0)
if (relocated_maps != 0) {
const char *newloc;
if ((newloc = mail_addr_find(relocated_maps, STR(nextrcpt),
IGNORE_ADDR_EXTENSION)) != 0) {
vstring_strcpy(channel, MAIL_SERVICE_ERROR);
vstring_sprintf(nexthop, "User has moved to %s", newloc);
} else if (dict_errno != 0) {
msg_warn("%s lookup failure", VAR_RELOCATED_MAPS);
*flags |= RESOLVE_FLAG_FAIL;
FREE_MEMORY_AND_RETURN;
}
}
/*
* Clean up.
*/
FREE_MEMORY_AND_RETURN;
}