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File fetcher: Avoid atoi for If-None-Match value parse.

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The file fetcher emits FETCH_NOTMODIFIED if the file is unchanged.
This commit is contained in:
Michael Drake 2019-11-09 17:06:04 +00:00
parent c92b31babe
commit b15cbb72ac
1 changed files with 19 additions and 10 deletions
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29
content/fetchers/file.c
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@ -50,6 +50,8 @@
#include "utils/corestrings.h"
#include "utils/messages.h"
#include "utils/utils.h"
#include "utils/log.h"
#include "utils/time.h"
#include "utils/ring.h"
#include "utils/file.h"
#include "netsurf/fetch.h"
@ -156,18 +158,25 @@ fetch_file_setup(struct fetch *fetchh,
/* Scan request headers looking for If-None-Match */
for (i = 0; headers[i] != NULL; i++) {
if (strncasecmp(headers[i], "If-None-Match:",
SLEN("If-None-Match:")) == 0) {
/* If-None-Match: "12345678" */
const char *d = headers[i] + SLEN("If-None-Match:");
if (strncasecmp(headers[i], "If-None-Match:",
SLEN("If-None-Match:")) != 0) {
continue;
}
/* Scan to first digit, if any */
while (*d != '\0' && (*d < '0' || '9' < *d))
d++;
/* If-None-Match: "12345678" */
const char *d = headers[i] + SLEN("If-None-Match:");
/* Convert to time_t */
if (*d != '\0')
ctx->file_etag = atoi(d);
/* Scan to first digit, if any */
while (*d != '\0' && (*d < '0' || '9' < *d))
d++;
/* Convert to time_t */
if (*d != '\0') {
ret = nsc_snptimet(d, strlen(d), &ctx->file_etag);
if (ret != NSERROR_OK) {
NSLOG(fetch, WARNING,
"Bad If-None-Match value");
}
}
}