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http.c: use CURLOPT_RANGE for range requests

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A HTTP server is permitted to return a non-range response to a HTTP
range request (and Apache httpd in fact does this in some cases).
While libcurl knows how to correctly handle this (by skipping bytes
before and after the requested range), it only turns on this handling
if it is aware that a range request is being made.  By manually
setting the range header instead of using CURLOPT_RANGE, we were
hiding the fact that this was a range request from libcurl.  This
could cause corruption.

Signed-off-by: David Turner <dturner@twopensource.com>
Reviewed-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
David Turner 2015-11-02 16:39:58 -05:00 committed by Junio C Hamano
parent 2635c2b8bf
commit 835c4d3689
2 changed files with 12 additions and 22 deletions
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33
http.c
View File

@ -30,7 +30,6 @@ static CURL *curl_default;
#endif
#define PREV_BUF_SIZE 4096
#define RANGE_HEADER_SIZE 30
char curl_errorstr[CURL_ERROR_SIZE];
@ -681,6 +680,7 @@ struct active_request_slot *get_active_slot(void)
curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
#endif
@ -1173,6 +1173,13 @@ static const char *get_accept_language(void)
return cached_accept_language;
}
static void http_opt_request_remainder(CURL *curl, off_t pos)
{
char buf[128];
xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
curl_easy_setopt(curl, CURLOPT_RANGE, buf);
}
/* http_request() targets */
#define HTTP_REQUEST_STRBUF 0
#define HTTP_REQUEST_FILE 1
@ -1201,11 +1208,8 @@ static int http_request(const char *url,
long posn = ftell(result);
curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
fwrite);
if (posn > 0) {
strbuf_addf(&buf, "Range: bytes=%ld-", posn);
headers = curl_slist_append(headers, buf.buf);
strbuf_reset(&buf);
}
if (posn > 0)
http_opt_request_remainder(slot->curl, posn);
} else
curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
fwrite_buffer);
@ -1515,10 +1519,6 @@ void release_http_pack_request(struct http_pack_request *preq)
fclose(preq->packfile);
preq->packfile = NULL;
}
if (preq->range_header != NULL) {
curl_slist_free_all(preq->range_header);
preq->range_header = NULL;
}
preq->slot = NULL;
free(preq->url);
free(preq);
@ -1582,7 +1582,6 @@ struct http_pack_request *new_http_pack_request(
struct packed_git *target, const char *base_url)
{
long prev_posn = 0;
char range[RANGE_HEADER_SIZE];
struct strbuf buf = STRBUF_INIT;
struct http_pack_request *preq;
@ -1620,10 +1619,7 @@ struct http_pack_request *new_http_pack_request(
fprintf(stderr,
"Resuming fetch of pack %s at byte %ld\n",
sha1_to_hex(target->sha1), prev_posn);
xsnprintf(range, sizeof(range), "Range: bytes=%ld-", prev_posn);
preq->range_header = curl_slist_append(NULL, range);
curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
preq->range_header);
http_opt_request_remainder(preq->slot->curl, prev_posn);
}
return preq;
@ -1673,8 +1669,6 @@ struct http_object_request *new_http_object_request(const char *base_url,
char prev_buf[PREV_BUF_SIZE];
ssize_t prev_read = 0;
long prev_posn = 0;
char range[RANGE_HEADER_SIZE];
struct curl_slist *range_header = NULL;
struct http_object_request *freq;
freq = xcalloc(1, sizeof(*freq));
@ -1780,10 +1774,7 @@ struct http_object_request *new_http_object_request(const char *base_url,
fprintf(stderr,
"Resuming fetch of object %s at byte %ld\n",
hex, prev_posn);
xsnprintf(range, sizeof(range), "Range: bytes=%ld-", prev_posn);
range_header = curl_slist_append(range_header, range);
curl_easy_setopt(freq->slot->curl,
CURLOPT_HTTPHEADER, range_header);
http_opt_request_remainder(freq->slot->curl, prev_posn);
}
return freq;

1
http.h
View File

@ -190,7 +190,6 @@ struct http_pack_request {
struct packed_git **lst;
FILE *packfile;
char tmpfile[PATH_MAX];
struct curl_slist *range_header;
struct active_request_slot *slot;
};