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tolerate case changes in X-TUID header name

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it is legal for an email system to simply change the case of rfc2822
headers, and at least one imap server apparently does just that.
this would lead to us not finding our own header, which is obviously not
helpful.

REFMAIL: CA+fD2U3hJEszmvwBsXEpTsaWgJ2Dh373mCESM3M0kg3ZwAYjaw@mail.gmail.com
This commit is contained in:
Oswald Buddenhagen 2015-09-01 14:21:45 +02:00
parent 57a0920fcb
commit 8979ebbdf2
4 changed files with 19 additions and 2 deletions
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1
src/common.h
View File

@ -116,6 +116,7 @@ void *memrchr( const void *s, int c, size_t n );
#endif
int starts_with( const char *str, int strl, const char *cmp, int cmpl );
int starts_with_upper( const char *str, int strl, const char *cmp, int cmpl );
int equals( const char *str, int strl, const char *cmp, int cmpl );
#ifndef HAVE_TIMEGM

2
src/drv_imap.c
View File

@ -967,7 +967,7 @@ parse_fetch_rsp( imap_store_t *ctx, list_t *list, char *s ATTR_UNUSED )
tmp = tmp->next;
if (!is_atom( tmp ))
goto bfail;
if (starts_with( tmp->val, tmp->len, "X-TUID: ", 8 ))
if (starts_with_upper( tmp->val, tmp->len, "X-TUID: ", 8 ))
tuid = tmp->val + 8;
} else {
bfail:

2
src/sync.c
View File

@ -338,7 +338,7 @@ msg_fetched( int sts, void *aux )
if (c == '\r')
lcrs++;
else if (c == '\n') {
if (starts_with( fmap + start, len - start, "X-TUID: ", 8 )) {
if (starts_with_upper( fmap + start, len - start, "X-TUID: ", 8 )) {
extra = (sbreak = start) - (ebreak = i);
goto oke;
}

16
src/util.c
View File

@ -27,6 +27,7 @@
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <ctype.h>
#include <pwd.h>
static int need_nl;
@ -241,6 +242,21 @@ starts_with( const char *str, int strl, const char *cmp, int cmpl )
return (strl >= cmpl) && !memcmp( str, cmp, cmpl );
}
int
starts_with_upper( const char *str, int strl, const char *cmp, int cmpl )
{
int i;
if (strl < 0)
strl = strnlen( str, cmpl + 1 );
if (strl < cmpl)
return 0;
for (i = 0; i < cmpl; i++)
if (str[i] != cmp[i] && toupper( str[i] ) != cmp[i])
return 0;
return 1;
}
int
equals( const char *str, int strl, const char *cmp, int cmpl )
{