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header.c
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header.c
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/*
* Copyright (c) Regents of The University of Michigan
* See COPYING.
*/
#include <config.h>
#include <ctype.h>
#include <stdio.h>
#include <string.h>
#include <strings.h>
#include <syslog.h>
#include <time.h>
#include <unistd.h>
#ifdef HAVE_LIBSASL
#include <sasl/sasl.h>
#endif /* HAVE_LIBSASL */
#ifdef HAVE_LIBSSL
#include <openssl/err.h>
#include <openssl/rand.h>
#include <openssl/ssl.h>
#endif /* HAVE_LIBSSL */
#include "envelope.h"
#include "header.h"
#include "queue.h"
#include "simta_malloc.h"
static int cfws_len(const char *);
static int domain_literal_len(const char *);
static int dot_atom_text_len(const char *);
static void header_exceptions(struct line_file *);
static void header_masquerade(struct line *);
static void header_remove(struct dll_entry *, struct receive_headers *);
static int header_singleton(const char *, const struct rfc822_header *);
static yastr header_string(struct line *);
static bool is_dot_atom_text(int);
static yastr parse_addr_spec(const char *, int *);
static yastr parse_mid(struct line *);
static int quoted_string_len(const char *);
static int
cfws_len(const char *c) {
int comment = 0;
int i;
for (i = 0;; i++) {
switch (c[ i ]) {
case ' ':
case '\t':
break;
case '(':
comment++;
break;
case ')':
comment--;
if (comment < 0) {
/* Unexpected closing parend */
return (-1);
}
break;
case '\\':
i++;
if (c[ i ] == '\0') {
/* EOL after \ */
return (-1);
}
break;
case '\0':
if (comment != 0) {
/* At least one unclosed parend */
return (-1);
} else {
return (i);
}
default:
if (comment == 0) {
return (i);
}
}
}
}
static int
domain_literal_len(const char *l) {
int i;
if (l[ 0 ] != '[') {
return (0);
}
for (i = 1; l[ i ] != '\0'; i++) {
switch (l[ i ]) {
case ']':
return (i + 1);
case '\\':
i++;
default:
break;
}
}
return (-1);
}
static int
dot_atom_text_len(const char *d) {
int i;
for (i = 0; is_dot_atom_text(d[ i ]); i++)
;
return (i);
}
static int
quoted_string_len(const char *q) {
int i;
if (q[ 0 ] != '"') {
return (0);
}
for (i = 1; q[ i ] != '\0'; i++) {
switch (q[ i ]) {
case '"':
return (i + 1);
case '\\':
i++;
break;
default:
break;
}
}
return (-1);
}
static yastr
parse_addr_spec(const char *addr, int *l) {
yastr buf;
const char *start;
int len;
buf = yaslempty();
if ((len = cfws_len(addr)) < 0) {
syslog(LOG_INFO, "parse_addr_spec %s: cfws_len failed: %s", addr, addr);
goto error;
}
start = addr + len;
if (*start == '"') {
if ((len = quoted_string_len(start)) < 0) {
syslog(LOG_INFO, "parse_addr_spec %s: quoted_string_len failed: %s",
addr, start);
goto error;
}
} else if ((len = dot_atom_text_len(start)) < 0) {
syslog(LOG_INFO, "parse_addr_spec %s: dot_atom_text_len failed: %s",
addr, start);
goto error;
}
buf = yaslcatlen(buf, start, (size_t)len);
start += len;
if (*start != '@') {
syslog(LOG_INFO, "parse_addr_spec %s: expected @: %s", addr, start);
goto error;
}
if ((len = dot_atom_text_len(start + 1)) < 0) {
syslog(LOG_INFO, "parse_addr_spec %s: dot_atom_text_len failed: %s",
addr, start);
goto error;
}
buf = yaslcatlen(buf, start, (size_t)(len + 1));
*l = start + len + 1 - addr;
return (buf);
error:
yaslfree(buf);
return (NULL);
}
static void
header_exceptions(struct line_file *lf) {
char *c;
char *end;
if ((lf == NULL) || (lf->l_first == NULL)) {
/* empty message */
return;
}
/* mail(1) on Solaris gives non-rfc compliant first header line */
c = lf->l_first->line_data;
if (strncasecmp(c, "From ", 5) == 0) {
c += 5;
for (end = c; (*end > 33) && (*end < 126); end++)
;
/* if "From "word ..., rewrite header "From:"word'\0' */
if ((end - c) > 0) {
*(lf->l_first->line_data + 4) = ':';
*end = '\0';
}
}
}
int
header_file_out(struct line_file *lf, FILE *file) {
struct line *l;
int rc, data_written = 0;
for (l = lf->l_first; l != NULL; l = l->line_next) {
if ((rc = fprintf(file, "%s\n", l->line_data)) < 0) {
return (rc);
}
data_written += rc;
}
return (data_written);
}
static yastr
header_string(struct line *l) {
yastr buf;
buf = yaslauto(l->line_data);
yaslrangesepright(buf, ':');
for (l = l->line_next; l != NULL; l = l->line_next) {
if ((*(l->line_data) != ' ') && (*(l->line_data) != '\t')) {
break;
}
buf = yaslcat(buf, l->line_data);
}
return buf;
}
/* RFC 5322 3.3 Date and Time Specification
* date-time = [ day-of-week "," ] date time [CFWS]
* day-of-week = ([FWS] day-name) / obs-day-of-week
* day-name = "Mon" / "Tue" / "Wed" / "Thu" /
* "Fri" / "Sat" / "Sun"
* date = day month year
* day = ([FWS] 1*2DIGIT FWS) / obs-day
* month = "Jan" / "Feb" / "Mar" / "Apr" /
* "May" / "Jun" / "Jul" / "Aug" /
* "Sep" / "Oct" / "Nov" / "Dec"
* year = (FWS 4*DIGIT FWS) / obs-year
* time = time-of-day zone
* time-of-day = hour ":" minute [ ":" second ]
* zone = (FWS ( "+" / "-" ) 4DIGIT) / obs-zone
*
* %T and %z are defined in ISO C99; C89 compilers might
* not support them.
*/
yastr
rfc5322_timestamp() {
time_t clock;
struct tm *tm;
yastr retval = NULL;
if (time(&clock) < 0) {
syslog(LOG_ERR, "Syserror: rfc5322_timestamp time: %m");
} else if ((tm = localtime(&clock)) == NULL) {
syslog(LOG_ERR, "Syserror: rfc5322_timestamp localtime: %m");
} else {
/* timestamps are at most 31 characters long. */
retval = yaslMakeRoomFor(yaslempty(), 32);
if (strftime(retval, 32, "%a, %d %b %Y %T %z", tm) == 0) {
syslog(LOG_ERR, "Syserror: rfc5322_timestamp strftime: %m");
yaslfree(retval);
retval = NULL;
}
yaslupdatelen(retval);
}
return retval;
}
static yastr
parse_mid(struct line *l) {
yastr buf;
int len;
char *c;
buf = header_string(l);
simta_debuglog(2, "parse_mid: %s", buf);
if ((len = cfws_len(buf)) < 0) {
syslog(LOG_INFO, "parse_mid: cfws_len failed: %s", buf);
goto error;
}
yaslrange(buf, len, -1);
if (*buf != '<') {
syslog(LOG_NOTICE, "parse_mid: expected '<': %s", buf);
goto error;
}
yaslrange(buf, 1, -1);
if ((len = quoted_string_len(buf)) < 0) {
syslog(LOG_INFO, "parse_mid: quoted_string_len failed: %s", buf);
goto error;
} else if ((len == 0) && (len = dot_atom_text_len(buf)) < 0) {
syslog(LOG_INFO, "parse_mid: dot_atom_text_len failed: %s", buf);
goto error;
}
c = buf + len;
if (*c != '@') {
syslog(LOG_NOTICE, "parse_mid: expected '@': %s", buf);
goto error;
}
c++;
if (*c == '[') {
if ((len = domain_literal_len(c)) < 0) {
syslog(LOG_INFO, "parse_mid: domain_literal_len failed: %s", c);
goto error;
}
} else {
if ((len = dot_atom_text_len(c)) < 0) {
syslog(LOG_INFO, "parse_mid: dot_atom_text_len failed: %s", c);
goto error;
}
}
c += len;
if (*c != '>') {
syslog(LOG_NOTICE, "parse_mid: expected '>': %s", c);
goto error;
}
if (((len = cfws_len(c + 1)) > 0) && (*(c + 1 + len) != '\0')) {
syslog(LOG_NOTICE, "parse_mid: illegal extra content: %s", c + 1);
goto error;
}
yaslrange(buf, 0, c - buf - 1);
return (buf);
error:
yaslfree(buf);
return (NULL);
}
/* return 0 if line is the next line in header block lf */
/* RFC 5322 2.1 General Description
* A message consists of header fields (collectively called "the header
* section of the message") followed, optionally, by a body. The header
* section is a sequence of lines of characters with special syntax as
* defined in this specification. The body is simply a sequence of
* characters that follows the header section and is separated from the
* header section by an empty line (i.e., a line with nothing preceding
* the CRLF).
*/
/* RFC 5322 2.2 Header Fields
* space (SP, ASCII value 32) and horizontal tab (HTAB, ASCII value 9)
* characters (together known as the white space characters, WSP)
*/
int
header_text(int line_no, char *line, struct receive_headers *rh, char **msg) {
char *c;
yastr key;
int len;
struct line *l;
struct rfc822_header *h;
struct dll_entry *dentry = NULL;
if (rh == NULL) {
return (-1);
}
if (rh->r_state == R_HEADER_END) {
return (1);
}
/* null line means that message data begins */
if ((*line) == '\0') {
rh->r_state = R_HEADER_END;
return (1);
} else if ((*line == ' ') || (*line == '\t')) {
/* if line is not the first line it could be header FWS */
if (line_no == 1) {
rh->r_state = R_HEADER_END;
return (1);
}
} else {
/* check to see if it's a proper field name followed by a colon */
if (((c = strchr(line, ':')) == NULL) || ((len = (c - line)) < 1)) {
rh->r_state = R_HEADER_END;
return (1);
}
key = yaslnew(line, (size_t)len);
yasltolower(key);
dentry = dll_lookup_or_create(&(rh->r_headers_index), key);
yaslfree(key);
}
rh->r_state = R_HEADER_READ;
if (rh->r_headers == NULL) {
rh->r_headers = line_file_create();
}
l = line_append(rh->r_headers, line, COPY);
l->line_no = line_no;
if (dentry) {
if ((h = dentry->dll_data) == NULL) {
h = simta_calloc(1, sizeof(struct rfc822_header));
dentry->dll_data = h;
}
h->h_count++;
ll_nokey_insert(&(h->h_lines), l, NULL);
}
return (0);
}
static void
header_masquerade(struct line *l) {
yastr inbuf, outbuf;
yastr *split;
size_t tok_count;
int i;
struct line *next;
inbuf = header_string(l);
outbuf = yaslcat(yaslnew(l->line_data, (size_t)(strchr(l->line_data, ':') -
l->line_data)),
": ");
split = yaslsplitlen(inbuf, yasllen(inbuf), ",", 1, &tok_count);
yaslfree(inbuf);
for (i = 0; i < tok_count; i++) {
yasltrim(split[ i ], " \t");
if (strchr(split[ i ], '@') == NULL) {
split[ i ] = yaslcatprintf(
split[ i ], "@%s", simta_config_str("core.masquerade"));
}
}
outbuf = yaslcat(outbuf, yasljoinyasl(split, tok_count, ", ", 2));
yaslfreesplitres(split, tok_count);
free(l->line_data);
l->line_data = simta_strdup(outbuf);
yaslfree(outbuf);
l = l->line_next;
while (l && ((*(l->line_data) == ' ') || (*(l->line_data) == '\t'))) {
next = l->line_next;
l->line_prev->line_next = next;
if (next) {
next->line_prev = l->line_prev;
}
free(l->line_data);
free(l);
l = next;
}
}
static void
header_remove(struct dll_entry *dentry, struct receive_headers *rh) {
struct line *l;
struct line **lp;
struct rfc822_header *mh;
/* Delete the line(s) belonging to this header */
mh = dentry->dll_data;
l = mh->h_lines->st_data;
if (l->line_prev != NULL) {
lp = &(l->line_prev->line_next);
} else {
lp = &(rh->r_headers->l_first);
}
for (l = l->line_next; l != NULL; l = l->line_next) {
if ((*(l->line_data) != ' ') && (*(l->line_data) != '\t')) {
break;
}
}
/* At this point, l is the line after the header we're deleting. */
*lp = l;
/* Remove the header from the index. */
dll_remove_entry(&(rh->r_headers_index), dentry);
}
int
header_check(struct receive_headers *rh, bool read_headers,
bool correct_headers, bool simsend) {
struct line *l;
struct rfc822_header *mh;
struct dll_entry *dentry;
int ret = 0;
int i;
size_t tok_count;
yastr buf = NULL;
yastr tmp;
yastr *split;
yastr daytime = NULL;
/* RFC 5322 3.6 Field definitions
* Field Min number Max number Notes
*
* orig-date 1 1
*
* from 1 1 See sender and 3.6.2
*
* sender 0* 1 MUST occur with multi-
* address from - see 3.6.2
*
* reply-to 0 1
*
* to 0 1
*
* cc 0 1
*
* bcc 0 1
*
* message-id 0* 1 SHOULD be present - see
* 3.6.4
*
* in-reply-to 0* 1 SHOULD occur in some
* replies - see 3.6.4
*
* references 0* 1 SHOULD occur in some
* replies - see 3.6.4
*
* subject 0 1
*
* header_check() might add missing fields.
*/
buf = yaslempty();
/* check headers for known mail clients behaving badly */
if (simsend) {
header_exceptions(rh->r_headers);
}
if ((dentry = dll_lookup(rh->r_headers_index, "received")) != NULL) {
rh->r_received_count =
((struct rfc822_header *)dentry->dll_data)->h_count;
}
/* From: */
if ((dentry = dll_lookup(rh->r_headers_index, "from")) != NULL) {
mh = dentry->dll_data;
ret += header_singleton("From", mh);
tmp = header_string(mh->h_lines->st_data);
split = parse_addr_list(tmp, &tok_count, HEADER_MAILBOX_LIST);
if ((split == NULL) && simsend) {
yaslfree(tmp);
header_masquerade(mh->h_lines->st_data);
tmp = header_string(mh->h_lines->st_data);
split = parse_addr_list(tmp, &tok_count, HEADER_MAILBOX_LIST);
}
if (tok_count != 1) {
syslog(LOG_INFO,
"header_check: parse_addr_list returned "
"an unexpected number of From addresses: %s",
tmp);
}
if (split == NULL) {
if (correct_headers && strlen(rh->r_env->e_mail)) {
/* Bad From:, we should regenerate it. */
header_remove(dentry, rh);
dentry = NULL;
} else {
ret++;
}
} else {
rh->r_env->e_header_from = yasldup(split[ 0 ]);
yaslfreesplitres(split, tok_count);
}
yaslfree(tmp);
}
if (dentry == NULL) {
if (correct_headers) {
syslog(LOG_INFO,
"header_check: generating new From header using "
"RFC5321.MailFrom");
if (rh->r_headers == NULL) {
rh->r_headers = line_file_create();
}
yaslclear(buf);
buf = yaslcatprintf(buf, "From: %s", rh->r_env->e_mail);
line_prepend(rh->r_headers, buf, COPY);
} else {
syslog(LOG_INFO, "header_check: missing From header");
ret++;
}
}
/* Sender: */
if ((dentry = dll_lookup(rh->r_headers_index, "sender")) != NULL) {
mh = dentry->dll_data;
ret += header_singleton("Sender", mh);
}
/* Date: */
if ((dentry = dll_lookup(rh->r_headers_index, "date")) != NULL) {
mh = dentry->dll_data;
ret += header_singleton("Date", mh);
} else if (correct_headers) {
/* generate Date: header */
if ((daytime = rfc5322_timestamp()) == NULL) {
ret = -1;
goto error;
}
if (rh->r_headers == NULL) {
rh->r_headers = line_file_create();
}
yaslclear(buf);
buf = yaslcatprintf(buf, "Date: %s", daytime);
yaslfree(daytime);
daytime = NULL;
line_prepend(rh->r_headers, buf, COPY);
} else {
syslog(LOG_INFO, "header_check: missing Date header");
ret++;
}
/* Message-ID: */
dentry = dll_lookup(rh->r_headers_index, "message-id");
if (dentry != NULL) {
mh = dentry->dll_data;
ret += header_singleton("Message-ID", mh);
tmp = parse_mid(mh->h_lines->st_data);
if (tmp == NULL) {
if (correct_headers) {
/* Bad Message-ID, we should regenerate it. */
header_remove(dentry, rh);
dentry = NULL;
} else {
ret++;
}
} else {
rh->r_env->e_mid = tmp;
tmp = NULL;
}
}
if ((dentry == NULL) && correct_headers) {
/* generate Message-ID: header */
if (rh->r_headers == NULL) {
rh->r_headers = line_file_create();
}
yaslclear(buf);
buf = yaslcatprintf(buf, "%s@%s", rh->r_env->e_id, simta_hostname);
rh->r_env->e_mid = yasldup(buf);
yaslclear(buf);
buf = yaslcatprintf(buf, "Message-ID: <%s>", rh->r_env->e_mid);
line_prepend(rh->r_headers, buf, COPY);
}
/* To: */
if ((dentry = dll_lookup(rh->r_headers_index, "to")) != NULL) {
mh = dentry->dll_data;
ret += header_singleton("To", mh);
tmp = header_string(mh->h_lines->st_data);
split = parse_addr_list(tmp, &tok_count, HEADER_ADDRESS_LIST);
if ((split == NULL) && simsend) {
yaslfree(tmp);
header_masquerade(mh->h_lines->st_data);
tmp = header_string(mh->h_lines->st_data);
split = parse_addr_list(tmp, &tok_count, HEADER_ADDRESS_LIST);
}
if (split == NULL) {
ret++;
} else {
if (read_headers) {
for (i = 0; i < tok_count; i++) {
env_recipient(rh->r_env, split[ i ]);
}
}
yaslfreesplitres(split, tok_count);
}
yaslfree(tmp);
}
/* Cc: */
if ((dentry = dll_lookup(rh->r_headers_index, "cc")) != NULL) {
mh = dentry->dll_data;
ret += header_singleton("Cc", mh);
tmp = header_string(mh->h_lines->st_data);
split = parse_addr_list(tmp, &tok_count, HEADER_ADDRESS_LIST);
if ((split == NULL) && simsend) {
yaslfree(tmp);
header_masquerade(mh->h_lines->st_data);
tmp = header_string(mh->h_lines->st_data);
split = parse_addr_list(tmp, &tok_count, HEADER_ADDRESS_LIST);
}
if (split == NULL) {
ret++;
} else {
if (read_headers) {
for (i = 0; i < tok_count; i++) {
env_recipient(rh->r_env, split[ i ]);
}
}
yaslfreesplitres(split, tok_count);
}
yaslfree(tmp);
}
/* Bcc: */
if ((dentry = dll_lookup(rh->r_headers_index, "bcc")) != NULL) {
mh = dentry->dll_data;
ret += header_singleton("Bcc", mh);
l = mh->h_lines->st_data;
tmp = header_string(l);
split = parse_addr_list(tmp, &tok_count, HEADER_ADDRESS_LIST);
if ((split == NULL) && simsend) {
yaslfree(tmp);
header_masquerade(mh->h_lines->st_data);
tmp = header_string(mh->h_lines->st_data);
split = parse_addr_list(tmp, &tok_count, HEADER_ADDRESS_LIST);
}
if (split == NULL) {
ret++;
} else {
if (read_headers) {
for (i = 0; i < tok_count; i++) {
env_recipient(rh->r_env, split[ i ]);
}
}
yaslfreesplitres(split, tok_count);
}
if (simsend) {
header_remove(dentry, rh);
}
}
/* Mime-Version: */
if (dll_lookup(rh->r_headers_index, "mime-version")) {
rh->r_env->e_8bitmime = true;
}
/* Subject: */
if ((dentry = dll_lookup(rh->r_headers_index, "subject")) != NULL) {
mh = dentry->dll_data;
ret += header_singleton("Subject", mh);
tmp = header_string(mh->h_lines->st_data);
yasltrim(tmp, " \t");
rh->r_env->e_subject = tmp;
tmp = NULL;
}
error:
yaslfree(buf);
return (ret);
}
static int
header_singleton(const char *name, const struct rfc822_header *h) {
if (h->h_count > 1) {
syslog(LOG_NOTICE, "header_singleton: too many '%s' headers: %d", name,
h->h_count);
return (1);
}
return (0);
}
/* RFC 5322 3.2.1 Quoted characters
* quoted-pair = ("\" (VCHAR / WSP)) / obs-qp
*
* RFC 5322 3.2.2 Folding White Space and Comments
* FWS = ([*WSP CRLF] 1*WSP) / obs-FWS
* ctext = %d33-39 / ; Printable US-ASCII
* %d42-91 / ; characters not including
* %d93-126 / ; "(", ")", or "\"
* obs-ctext
* ccontent = ctext / quoted-pair / comment
* comment = "(" *([FWS] ccontent) [FWS] ")"
* CFWS = (1*([FWS] comment) [FWS]) / FWS
*
* RFC 5322 3.2.3 Atom
* atext = ALPHA / DIGIT / ; Printable US-ASCII
* "!" / "#" / ; characters not including
* "$" / "%" / ; specials. Used for atoms.
* "&" / "'" /
* "*" / "+" /
* "-" / "/" /
* "=" / "?" /
* "^" / "_" /
* "`" / "{" /
* "|" / "}" /
* "~"
* atom = [CFWS] 1*atext [CFWS]
* dot-atom-text = 1*atext *("." 1*atext)
* dot-atom = [CFWS] dot-atom-text [CFWS]
* specials = "(" / ")" / ; Special characters that do
* "<" / ">" / ; not appear in atext
* "[" / "]" /
* ":" / ";" /
* "@" / "\" /
* "," / "." /
* DQUOTE
*
* RFC 5322 3.2.4 Quoted Strings
* qtext = %d33 / ; Printable US-ASCII
* %d35-91 / ; characters not including
* %d93-126 / ; "\" or the quote character
* obs-qtext
* qcontent = qtext / quoted-pair
* quoted-string = [CFWS]
* DQUOTE *([FWS] qcontent) [FWS] DQUOTE
* [CFWS]
*
* RFC 5322 3.2.5 Miscellaneous Tokens
* word = atom / quoted-string
* phrase = 1*word / obs-phrase
*
* RFC 5322 3.4 Address Specification:
*
* address = mailbox / group
* mailbox = name-addr / addr-spec
* name-addr = [display-name] angle-addr
* angle-addr = [CFWS] "<" addr-spec ">" [CFWS]
* obs-angle-addr
* group = display-name ":" [group-list] ";" [CFWS]
* display-name = phrase
* mailbox-list = (mailbox *("," mailbox)) / obs-mbox-list
* address-list = (address *("," address)) / obs-addr-list
* group-list = mailbox-list / CFWS / obs-group-list
*
* RFC 5322 3.4.1 Addr-Spec Specification
*
* addr-spec = local-part "@" domain
* local-part = dot-atom / quoted-string / obs-local-part
* domain = dot-atom / domain-literal / obs-domain
* domain-literal = [CFWS] "[" *([FWS] dtext) [FWS] "]" [CFWS]
* dtext = %d33-90 / ; Printable US-ASCII
* %d94-126 / ; characters not including
* obs-dtext ; "[", "]", or "\"
*/
/*
* ( dot-atom-text | quoted-string )
*
* ( dot-atom-text | quoted-string ) '@' ( dot-atom-text | domain-literal )
*/
bool
is_emailaddr(char *addr) {
if (parse_emailaddr(EMAIL_ADDRESS_NORMAL, addr, NULL, NULL) == SIMTA_OK) {
return true;
}
return false;
}
simta_result
parse_emailaddr(int mode, char *addr, char **user, char **domain) {
char *u;
char *d;
char *end;
char *at;
char *eol;
/* make sure mode is in range */
switch (mode) {
case RFC_821_MAIL_FROM:
case RFC_821_RCPT_TO:
case EMAIL_ADDRESS_NORMAL:
break;
default:
return SIMTA_ERR;
}
u = addr;
if (u == NULL) {
return SIMTA_ERR;
}
if (mode != EMAIL_ADDRESS_NORMAL) {
if (*u != '<') {
return SIMTA_ERR;
}
u++;
}
if (*u == '\0') {
if (mode == EMAIL_ADDRESS_NORMAL) {
return SIMTA_OK;
}
return SIMTA_ERR;
} else if (*u == '@') {
if (mode == EMAIL_ADDRESS_NORMAL) {
return SIMTA_ERR;
}
/* do at-domain-literal - consume domain */
u++;
if (*u == '[') {
if ((end = token_domain_literal(u)) == NULL) {
return SIMTA_ERR;
}
} else {
if ((end = token_domain(u)) == NULL) {
return SIMTA_ERR;
}
}
end++;
while (*end == ',') {
u = end + 1;
if (*u != '@') {
return SIMTA_ERR;
}
/* consume domain */
u++;
if (*u == '[') {
if ((end = token_domain_literal(u)) == NULL) {
return SIMTA_ERR;
}
} else {
if ((end = token_domain(u)) == NULL) {
return SIMTA_ERR;
}
}
end++;
}
if (*end != ':') {
return SIMTA_ERR;
}
u = end + 1;
}
if (user) {
*user = u;
}
/* consume the user portion of the address */
/* <> is a valid address for MAIL FROM commands */
if (*u == '>') {
if ((mode == RFC_821_MAIL_FROM) && (*(u + 1) == '\0')) {
*u = '\0';
*domain = NULL;
return SIMTA_OK;
}
return SIMTA_ERR;
} else if (*u == '"') {
if ((end = token_quoted_string(u)) == NULL) {