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sendmail: support long header fields for recipients

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Support long header fields in To:, Cc: and Bcc: headers.

Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Aaro Koskinen 2013-02-25 00:45:10 +02:00 committed by Denys Vlasenko
parent a8ba0a0d0c
commit 236f222cde
1 changed files with 18 additions and 1 deletions
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19
mailutils/sendmail.c
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@ -181,6 +181,12 @@ int sendmail_main(int argc UNUSED_PARAM, char **argv)
char *host = sane_address(safe_gethostname()); char *host = sane_address(safe_gethostname());
unsigned nheaders = 0; unsigned nheaders = 0;
int code; int code;
enum {
HDR_OTHER = 0,
HDR_TOCC,
HDR_BCC,
} last_hdr = 0;
int check_hdr;
enum { enum {
//--- standard options //--- standard options
@ -345,20 +351,31 @@ int sendmail_main(int argc UNUSED_PARAM, char **argv)
if (opts & OPT_t) { if (opts & OPT_t) {
if (0 == strncasecmp("To:", s, 3) || 0 == strncasecmp("Bcc:" + 1, s, 3)) { if (0 == strncasecmp("To:", s, 3) || 0 == strncasecmp("Bcc:" + 1, s, 3)) {
rcptto_list(s+3); rcptto_list(s+3);
last_hdr = HDR_TOCC;
goto addheader; goto addheader;
} }
// Bcc: header adds blind copy (hidden) recipient // Bcc: header adds blind copy (hidden) recipient
if (0 == strncasecmp("Bcc:", s, 4)) { if (0 == strncasecmp("Bcc:", s, 4)) {
rcptto_list(s+4); rcptto_list(s+4);
free(s); free(s);
last_hdr = HDR_BCC;
continue; // N.B. Bcc: vanishes from headers! continue; // N.B. Bcc: vanishes from headers!
} }
} }
if (strchr(s, ':') || (list && isspace(s[0]))) { check_hdr = list && isspace(s[0]);
if (strchr(s, ':') || check_hdr) {
// other headers go verbatim // other headers go verbatim
// N.B. RFC2822 2.2.3 "Long Header Fields" allows for headers to occupy several lines. // N.B. RFC2822 2.2.3 "Long Header Fields" allows for headers to occupy several lines.
// Continuation is denoted by prefixing additional lines with whitespace(s). // Continuation is denoted by prefixing additional lines with whitespace(s).
// Thanks (stefan.seyfried at googlemail.com) for pointing this out. // Thanks (stefan.seyfried at googlemail.com) for pointing this out.
if (check_hdr && last_hdr != HDR_OTHER) {
rcptto_list(s+1);
if (last_hdr == HDR_BCC)
continue;
// N.B. Bcc: vanishes from headers!
} else {
last_hdr = HDR_OTHER;
}
addheader: addheader:
// N.B. we allow MAX_HEADERS generic headers at most to prevent attacks // N.B. we allow MAX_HEADERS generic headers at most to prevent attacks
if (MAX_HEADERS && ++nheaders >= MAX_HEADERS) if (MAX_HEADERS && ++nheaders >= MAX_HEADERS)