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message-address.c
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message-address.c
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/* Copyright (c) 2002-2017 Dovecot authors, see the included COPYING file */
#include "lib.h"
#include "str.h"
#include "strescape.h"
#include "message-parser.h"
#include "message-address.h"
#include "rfc822-parser.h"
struct message_address_parser_context {
pool_t pool;
struct rfc822_parser_context parser;
struct message_address *first_addr, *last_addr, addr;
string_t *str;
bool fill_missing;
};
static void add_address(struct message_address_parser_context *ctx)
{
struct message_address *addr;
addr = p_new(ctx->pool, struct message_address, 1);
memcpy(addr, &ctx->addr, sizeof(ctx->addr));
i_zero(&ctx->addr);
if (ctx->first_addr == NULL)
ctx->first_addr = addr;
else
ctx->last_addr->next = addr;
ctx->last_addr = addr;
}
/* quote with "" and escape all '\', '"' and "'" characters if need */
static void str_append_maybe_escape(string_t *dest, const char *cstr, bool escape_dot)
{
const char *p;
/* see if we need to quote it */
for (p = cstr; *p != '\0'; p++) {
if (!IS_ATEXT(*p) && (escape_dot || *p != '.'))
break;
}
if (*p == '\0') {
str_append_data(dest, cstr, (size_t) (p - cstr));
return;
}
/* see if we need to escape it */
for (p = cstr; *p != '\0'; p++) {
if (IS_ESCAPED_CHAR(*p))
break;
}
if (*p == '\0') {
/* only quote */
str_append_c(dest, '"');
str_append_data(dest, cstr, (size_t) (p - cstr));
str_append_c(dest, '"');
return;
}
/* quote and escape */
str_append_c(dest, '"');
str_append_data(dest, cstr, (size_t) (p - cstr));
for (; *p != '\0'; p++) {
if (IS_ESCAPED_CHAR(*p))
str_append_c(dest, '\\');
str_append_c(dest, *p);
}
str_append_c(dest, '"');
}
static int parse_local_part(struct message_address_parser_context *ctx)
{
int ret;
/*
local-part = dot-atom / quoted-string / obs-local-part
obs-local-part = word *("." word)
*/
i_assert(ctx->parser.data != ctx->parser.end);
str_truncate(ctx->str, 0);
if (*ctx->parser.data == '"')
ret = rfc822_parse_quoted_string(&ctx->parser, ctx->str);
else
ret = rfc822_parse_dot_atom(&ctx->parser, ctx->str);
if (ret < 0)
return -1;
ctx->addr.mailbox = p_strdup(ctx->pool, str_c(ctx->str));
return ret;
}
static int parse_domain(struct message_address_parser_context *ctx)
{
int ret;
str_truncate(ctx->str, 0);
if ((ret = rfc822_parse_domain(&ctx->parser, ctx->str)) < 0)
return -1;
ctx->addr.domain = p_strdup(ctx->pool, str_c(ctx->str));
return ret;
}
static int parse_domain_list(struct message_address_parser_context *ctx)
{
int ret;
/* obs-domain-list = "@" domain *(*(CFWS / "," ) [CFWS] "@" domain) */
str_truncate(ctx->str, 0);
for (;;) {
if (ctx->parser.data == ctx->parser.end)
return 0;
if (*ctx->parser.data != '@')
break;
if (str_len(ctx->str) > 0)
str_append_c(ctx->str, ',');
str_append_c(ctx->str, '@');
if ((ret = rfc822_parse_domain(&ctx->parser, ctx->str)) <= 0)
return ret;
while (rfc822_skip_lwsp(&ctx->parser) > 0 &&
*ctx->parser.data == ',')
ctx->parser.data++;
}
ctx->addr.route = p_strdup(ctx->pool, str_c(ctx->str));
return 1;
}
static int parse_angle_addr(struct message_address_parser_context *ctx)
{
int ret;
/* "<" [ "@" route ":" ] local-part "@" domain ">" */
i_assert(*ctx->parser.data == '<');
ctx->parser.data++;
if ((ret = rfc822_skip_lwsp(&ctx->parser)) <= 0)
return ret;
if (*ctx->parser.data == '@') {
if (parse_domain_list(ctx) <= 0 || *ctx->parser.data != ':') {
ctx->addr.route = "INVALID_ROUTE";
return -1;
}
ctx->parser.data++;
if ((ret = rfc822_skip_lwsp(&ctx->parser)) <= 0)
return ret;
}
if ((ret = parse_local_part(ctx)) <= 0)
return ret;
if (*ctx->parser.data == '@') {
if ((ret = parse_domain(ctx)) <= 0)
return ret;
}
if (*ctx->parser.data != '>')
return -1;
ctx->parser.data++;
return rfc822_skip_lwsp(&ctx->parser);
}
static int parse_name_addr(struct message_address_parser_context *ctx)
{
/*
name-addr = [display-name] angle-addr
display-name = phrase
*/
str_truncate(ctx->str, 0);
if (rfc822_parse_phrase(&ctx->parser, ctx->str) <= 0 ||
*ctx->parser.data != '<')
return -1;
ctx->addr.name = p_strdup(ctx->pool, str_c(ctx->str));
if (*ctx->addr.name == '\0') {
/* Cope with "<address>" without display name */
ctx->addr.name = NULL;
}
if (parse_angle_addr(ctx) < 0) {
/* broken */
ctx->addr.domain = "SYNTAX_ERROR";
ctx->addr.invalid_syntax = TRUE;
}
return ctx->parser.data != ctx->parser.end ? 1 : 0;
}
static int parse_addr_spec(struct message_address_parser_context *ctx)
{
/* addr-spec = local-part "@" domain */
int ret, ret2;
if (ctx->parser.last_comment != NULL)
str_truncate(ctx->parser.last_comment, 0);
ret = parse_local_part(ctx);
if (ret <= 0) {
/* end of input or parsing local-part failed */
ctx->addr.invalid_syntax = TRUE;
}
if (ret != 0 && *ctx->parser.data == '@') {
ret2 = parse_domain(ctx);
if (ret2 <= 0)
ret = ret2;
}
if (ctx->parser.last_comment != NULL) {
if (str_len(ctx->parser.last_comment) > 0) {
ctx->addr.name =
p_strdup(ctx->pool, str_c(ctx->parser.last_comment));
}
}
return ret;
}
static void add_fixed_address(struct message_address_parser_context *ctx)
{
if (ctx->addr.mailbox == NULL) {
ctx->addr.mailbox = !ctx->fill_missing ? "" : "MISSING_MAILBOX";
ctx->addr.invalid_syntax = TRUE;
}
if (ctx->addr.domain == NULL) {
ctx->addr.domain = !ctx->fill_missing ? "" : "MISSING_DOMAIN";
ctx->addr.invalid_syntax = TRUE;
}
add_address(ctx);
}
static int parse_mailbox(struct message_address_parser_context *ctx)
{
const unsigned char *start;
int ret;
/* mailbox = name-addr / addr-spec */
start = ctx->parser.data;
if ((ret = parse_name_addr(ctx)) < 0) {
/* nope, should be addr-spec */
ctx->parser.data = start;
ret = parse_addr_spec(ctx);
if (ctx->addr.invalid_syntax && ctx->addr.name == NULL &&
ctx->addr.mailbox != NULL && ctx->addr.domain == NULL) {
ctx->addr.name = ctx->addr.mailbox;
ctx->addr.mailbox = NULL;
}
}
if (ret < 0)
ctx->addr.invalid_syntax = TRUE;
add_fixed_address(ctx);
return ret;
}
static int parse_group(struct message_address_parser_context *ctx)
{
int ret;
/*
group = display-name ":" [mailbox-list / CFWS] ";" [CFWS]
display-name = phrase
*/
str_truncate(ctx->str, 0);
if (rfc822_parse_phrase(&ctx->parser, ctx->str) <= 0 ||
*ctx->parser.data != ':')
return -1;
/* from now on don't return -1 even if there are problems, so that
the caller knows this is a group */
ctx->parser.data++;
if ((ret = rfc822_skip_lwsp(&ctx->parser)) <= 0)
ctx->addr.invalid_syntax = TRUE;
ctx->addr.mailbox = p_strdup(ctx->pool, str_c(ctx->str));
add_address(ctx);
if (ret > 0 && *ctx->parser.data != ';') {
for (;;) {
/* mailbox-list =
(mailbox *("," mailbox)) / obs-mbox-list */
if (parse_mailbox(ctx) <= 0) {
ret = -1;
break;
}
if (*ctx->parser.data != ',')
break;
ctx->parser.data++;
if (rfc822_skip_lwsp(&ctx->parser) <= 0) {
ret = -1;
break;
}
}
}
if (ret >= 0) {
if (*ctx->parser.data != ';')
ret = -1;
else {
ctx->parser.data++;
ret = rfc822_skip_lwsp(&ctx->parser);
}
}
if (ret < 0)
ctx->addr.invalid_syntax = TRUE;
add_address(ctx);
return ret == 0 ? 0 : 1;
}
static int parse_address(struct message_address_parser_context *ctx)
{
const unsigned char *start;
int ret;
/* address = mailbox / group */
start = ctx->parser.data;
if ((ret = parse_group(ctx)) < 0) {
/* not a group, try mailbox */
ctx->parser.data = start;
ret = parse_mailbox(ctx);
}
return ret;
}
static int parse_address_list(struct message_address_parser_context *ctx,
unsigned int max_addresses)
{
int ret = 0;
/* address-list = (address *("," address)) / obs-addr-list */
while (max_addresses > 0) {
max_addresses--;
if ((ret = parse_address(ctx)) == 0)
break;
if (*ctx->parser.data != ',') {
ret = -1;
break;
}
ctx->parser.data++;
if ((ret = rfc822_skip_lwsp(&ctx->parser)) <= 0) {
if (ret < 0) {
/* ends with some garbage */
add_fixed_address(ctx);
}
break;
}
}
return ret;
}
static struct message_address *
message_address_parse_real(pool_t pool, const unsigned char *data, size_t size,
unsigned int max_addresses, bool fill_missing)
{
struct message_address_parser_context ctx;
i_zero(&ctx);
rfc822_parser_init(&ctx.parser, data, size, t_str_new(128));
ctx.pool = pool;
ctx.str = t_str_new(128);
ctx.fill_missing = fill_missing;
if (rfc822_skip_lwsp(&ctx.parser) <= 0) {
/* no addresses */
return NULL;
}
(void)parse_address_list(&ctx, max_addresses);
return ctx.first_addr;
}
struct message_address *
message_address_parse(pool_t pool, const unsigned char *data, size_t size,
unsigned int max_addresses, bool fill_missing)
{
struct message_address *addr;
if (pool->datastack_pool) {
return message_address_parse_real(pool, data, size,
max_addresses, fill_missing);
}
T_BEGIN {
addr = message_address_parse_real(pool, data, size,
max_addresses, fill_missing);
} T_END;
return addr;
}
void message_address_write(string_t *str, const struct message_address *addr)
{
const char *tmp;
bool first = TRUE, in_group = FALSE;
/* a) mailbox@domain
b) name <@route:mailbox@domain>
c) group: .. ; */
while (addr != NULL) {
if (first)
first = FALSE;
else
str_append(str, ", ");
if (addr->domain == NULL) {
if (!in_group) {
/* beginning of group. mailbox is the group
name, others are NULL. */
if (addr->mailbox != NULL && *addr->mailbox != '\0') {
/* check for MIME encoded-word */
if (strstr(addr->mailbox, "=?") != NULL)
/* MIME encoded-word MUST NOT appear within a 'quoted-string'
so escaping and quoting of phrase is not possible, instead
use obsolete RFC822 phrase syntax which allow spaces */
str_append(str, addr->mailbox);
else
str_append_maybe_escape(str, addr->mailbox, TRUE);
} else {
/* empty group name needs to be quoted */
str_append(str, "\"\"");
}
str_append(str, ": ");
first = TRUE;
} else {
/* end of group. all fields should be NULL. */
i_assert(addr->mailbox == NULL);
/* cut out the ", " */
tmp = str_c(str)+str_len(str)-2;
i_assert((tmp[0] == ',' || tmp[0] == ':') && tmp[1] == ' ');
if (tmp[0] == ',' && tmp[1] == ' ')
str_truncate(str, str_len(str)-2);
else if (tmp[0] == ':' && tmp[1] == ' ')
str_truncate(str, str_len(str)-1);
str_append_c(str, ';');
}
in_group = !in_group;
} else {
/* "Display Name" <mailbox@domain> */
i_assert(addr->mailbox != NULL);
if (addr->name != NULL) {
/* check for MIME encoded-word */
if (strstr(addr->name, "=?") != NULL)
/* MIME encoded-word MUST NOT appear within a 'quoted-string'
so escaping and quoting of phrase is not possible, instead
use obsolete RFC822 phrase syntax which allow spaces */
str_append(str, addr->name);
else
str_append_maybe_escape(str, addr->name, TRUE);
}
if (addr->route != NULL ||
addr->mailbox[0] != '\0' ||
addr->domain[0] != '\0') {
if (addr->name != NULL && addr->name[0] != '\0')
str_append_c(str, ' ');
str_append_c(str, '<');
if (addr->route != NULL) {
str_append(str, addr->route);
str_append_c(str, ':');
}
if (addr->mailbox[0] == '\0')
str_append(str, "\"\"");
else
str_append_maybe_escape(str, addr->mailbox, FALSE);
if (addr->domain[0] != '\0') {
str_append_c(str, '@');
str_append(str, addr->domain);
}
str_append_c(str, '>');
}
}
addr = addr->next;
}
}
static const char *address_headers[] = {
"From", "Sender", "Reply-To",
"To", "Cc", "Bcc",
"Resent-From", "Resent-Sender", "Resent-To", "Resent-Cc", "Resent-Bcc"
};
bool message_header_is_address(const char *hdr_name)
{
unsigned int i;
for (i = 0; i < N_ELEMENTS(address_headers); i++) {
if (strcasecmp(hdr_name, address_headers[i]) == 0)
return TRUE;
}
return FALSE;
}