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parser issue_char audit

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Signed-off-by: Andy Green <andy.green@linaro.org>
This commit is contained in:
Andy Green 2016-01-20 09:26:48 +08:00
parent 9d73971cf5
commit 9b2b9d1a7e
1 changed files with 11 additions and 9 deletions
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20
lib/parsers.c
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@ -235,6 +235,10 @@ static int issue_char(struct lws *wsi, unsigned char c)
/* Insert a null character when we *hit* the limit: */
if (frag_len == wsi->u.hdr.current_token_limit) {
if (wsi->u.hdr.ah->pos == sizeof(wsi->u.hdr.ah->data)) {
lwsl_warn("excessive header content 2\n");
return -1;
}
wsi->u.hdr.ah->data[wsi->u.hdr.ah->pos++] = '\0';
lwsl_warn("header %i exceeds limit\n",
wsi->u.hdr.parser_state);
@ -340,9 +344,12 @@ int lws_parse(struct lws *wsi, unsigned char c)
switch (wsi->u.hdr.ups) {
case URIPS_IDLE:
if (!c)
return -1;
/* genuine delimiter */
if ((c == '&' || c == ';') && !enc) {
issue_char(wsi, c);
if (issue_char(wsi, c) < 0)
return 1;
/* swallow the terminator */
ah->frags[ah->nfrag].len--;
/* link to next fragment */
@ -429,7 +436,8 @@ int lws_parse(struct lws *wsi, unsigned char c)
if (c == '?' && !enc &&
!ah->frag_index[WSI_TOKEN_HTTP_URI_ARGS]) { /* start of URI arguments */
/* seal off uri header */
ah->data[ah->pos++] = '\0';
if (issue_char(wsi, '\0') < 0)
return -1;
/* move to using WSI_TOKEN_HTTP_URI_ARGS */
ah->nfrag++;
@ -568,14 +576,8 @@ excessive:
while (ah->frags[n].nfrag)
n = ah->frags[n].nfrag;
ah->frags[n].nfrag = ah->nfrag;
if (ah->pos == sizeof(ah->data)) {
lwsl_warn("excessive header content\n");
if (issue_char(wsi, ' ') < 0)
return -1;
}
ah->data[ah->pos++] = ' ';
ah->frags[ah->nfrag].len++;
break;
/* skipping arg part of a name we didn't recognize */