/*
* deletes an entry at pos and leaves a gap; leaving a gap makes it
* possible to iterate(search) and delete fields at the same time
*/
void
httpHeaderDelAt(HttpHeader * hdr, HttpHeaderPos pos)
{
HttpHeaderEntry *e;
assert(pos >= HttpHeaderInitPos && pos < hdr->entries.count);
e = hdr->entries.items[pos];
hdr->entries.items[pos] = NULL;
/* decrement header length, allow for ": " and crlf */
hdr->len -= strLen(e->name) + 2 + strLen(e->value) + 2;
assert(hdr->len >= 0);
httpHeaderEntryDestroy(e);
}
void
httpHeaderClean(HttpHeader * hdr)
{
HttpHeaderPos pos = HttpHeaderInitPos;
HttpHeaderEntry *e;
assert(hdr);
assert(hdr->owner > hoNone && hdr->owner <= hoReply);
debug(55, 7) ("cleaning hdr: %p owner: %d\n", hdr, hdr->owner);
/*
* An unfortunate bug. The hdr->entries array is initialized
* such that count is set to zero. httpHeaderClean() seems to
* be called both when 'hdr' is created, and destroyed. Thus,
* we accumulate a large number of zero counts for 'hdr' before
* it is ever used. Can't think of a good way to fix it, except
* adding a state variable that indicates whether or not 'hdr'
* has been used. As a hack, just never count zero-sized header
* arrays.
*/
if (0 != hdr->entries.count)
statHistCount(&HttpHeaderStats[hdr->owner].hdrUCountDistr, hdr->entries.count);
HttpHeaderStats[hdr->owner].destroyedCount++;
HttpHeaderStats[hdr->owner].busyDestroyedCount += hdr->entries.count > 0;
while ((e = httpHeaderGetEntry(hdr, &pos))) {
/* tmp hack to try to avoid coredumps */
if (e->id >= HDR_ENUM_END) {
debug(55, 0) ("httpHeaderClean BUG: entry[%d] is invalid (%d). Ignored.\n",
(int) pos, e->id);
} else {
statHistCount(&HttpHeaderStats[hdr->owner].fieldTypeDistr, e->id);
/* yes, this destroy() leaves us in an inconsistent state */
httpHeaderEntryDestroy(e);
}
}
arrayClean(&hdr->entries);
}
int
httpHeaderParse(HttpHeader * hdr, const char *header_start, const char *header_end)
{
const char *field_ptr = header_start;
HttpHeaderEntry *e;
assert(hdr);
assert(header_start && header_end);
debug(55, 7) ("parsing hdr: (%p)\n%s\n", hdr, getStringPrefix(header_start, header_end));
HttpHeaderStats[hdr->owner].parsedCount++;
if (memchr(header_start, '\0', header_end - header_start)) {
debug(55, 1) ("WARNING: HTTP header contains NULL characters {%s}\n",
getStringPrefix(header_start, header_end));
return httpHeaderReset(hdr);
}
/* common format headers are "<name>:[ws]<value>" lines delimited by <CRLF>.
* continuation lines start with a (single) space or tab */
while (field_ptr < header_end) {
const char *field_start = field_ptr;
const char *field_end;
do {
const char *this_line = field_ptr;
field_ptr = memchr(field_ptr, '\n', header_end - field_ptr);
if (!field_ptr)
return httpHeaderReset(hdr); /* missing <LF> */
field_end = field_ptr;
field_ptr++; /* Move to next line */
if (field_end > this_line && field_end[-1] == '\r') {
field_end--; /* Ignore CR LF */
/* Ignore CR CR LF in relaxed mode */
if (Config.onoff.relaxed_header_parser && field_end > this_line + 1 && field_end[-1] == '\r') {
debug(55, Config.onoff.relaxed_header_parser <= 0 ? 1 : 2)
("WARNING: Double CR characters in HTTP header {%s}\n", getStringPrefix(field_start, field_end));
field_end--;
}
}
/* Barf on stray CR characters */
if (memchr(this_line, '\r', field_end - this_line)) {
debug(55, 1) ("WARNING: suspicious CR characters in HTTP header {%s}\n",
getStringPrefix(field_start, field_end));
if (Config.onoff.relaxed_header_parser) {
char *p = (char *) this_line; /* XXX Warning! This destroys original header content and violates specifications somewhat */
while ((p = memchr(p, '\r', field_end - p)) != NULL)
*p++ = ' ';
} else
return httpHeaderReset(hdr);
}
if (this_line + 1 == field_end && this_line > field_start) {
debug(55, 1) ("WARNING: Blank continuation line in HTTP header {%s}\n",
getStringPrefix(header_start, header_end));
return httpHeaderReset(hdr);
}
} while (field_ptr < header_end && (*field_ptr == ' ' || *field_ptr == '\t'));
if (field_start == field_end) {
if (field_ptr < header_end) {
debug(55, 1) ("WARNING: unparseable HTTP header field near {%s}\n",
getStringPrefix(field_start, header_end));
return httpHeaderReset(hdr);
}
break; /* terminating blank line */
}
e = httpHeaderEntryParseCreate(field_start, field_end);
if (NULL == e) {
debug(55, 1) ("WARNING: unparseable HTTP header field {%s}\n",
getStringPrefix(field_start, field_end));
debug(55, Config.onoff.relaxed_header_parser <= 0 ? 1 : 2)
(" in {%s}\n", getStringPrefix(header_start, header_end));
if (Config.onoff.relaxed_header_parser)
continue;
else
return httpHeaderReset(hdr);
}
if (e->id == HDR_CONTENT_LENGTH) {
squid_off_t l1;
HttpHeaderEntry *e2;
if (!httpHeaderParseSize(strBuf(e->value), &l1)) {
debug(55, 1) ("WARNING: Unparseable content-length '%s'\n", strBuf(e->value));
httpHeaderEntryDestroy(e);
return httpHeaderReset(hdr);
}
e2 = httpHeaderFindEntry(hdr, e->id);
if (e2 && strCmp(e->value, strBuf(e2->value)) != 0) {
squid_off_t l2;
debug(55, Config.onoff.relaxed_header_parser <= 0 ? 1 : 2) ("WARNING: found two conflicting content-length headers in {%s}\n", getStringPrefix(header_start, header_end));
if (!Config.onoff.relaxed_header_parser) {
httpHeaderEntryDestroy(e);
return httpHeaderReset(hdr);
}
if (!httpHeaderParseSize(strBuf(e2->value), &l2)) {
debug(55, 1) ("WARNING: Unparseable content-length '%s'\n", strBuf(e->value));
httpHeaderEntryDestroy(e);
return httpHeaderReset(hdr);
}
if (l1 > l2) {
httpHeaderDelById(hdr, e2->id);
} else {
httpHeaderEntryDestroy(e);
continue;
}
} else if (e2) {
debug(55, Config.onoff.relaxed_header_parser <= 0 ? 1 : 2)
("NOTICE: found double content-length header\n");
if (Config.onoff.relaxed_header_parser) {
httpHeaderEntryDestroy(e);
continue;
} else {
httpHeaderEntryDestroy(e);
return httpHeaderReset(hdr);
}
}
}
if (e->id == HDR_OTHER && stringHasWhitespace(strBuf(e->name))) {
debug(55, Config.onoff.relaxed_header_parser <= 0 ? 1 : 2)
("WARNING: found whitespace in HTTP header name {%s}\n", getStringPrefix(field_start, field_end));
if (!Config.onoff.relaxed_header_parser) {
httpHeaderEntryDestroy(e);
return httpHeaderReset(hdr);
}
}
httpHeaderAddEntry(hdr, e);
}
return 1; /* even if no fields where found, it is a valid header */
}