David TurnerA 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> ---
This one incorporates Jeff's suggestions about off_t. It also simplifies by removing the possiblity of a missing low-end of a range; the entire point of this function is to add a range HEADER and a range of - is nugatory.
--- http.c | 33 ++++++++++++--------------------- http.h | 1 - 2 files changed, 12 insertions(+), 22 deletions(-)
Show changes to 2 files +12 −22
http.c, http.h
diff --git a/http.c b/http.c index 6b89dea..f9a0dc5 100644 --- a/http.c +++ b/http.c @@ -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]; @@ -692,6 +691,7 @@ 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 @@ -1184,6 +1184,13 @@ 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 @@ -1212,11 +1219,8 @@ 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); @@ -1526,10 +1530,6 @@ 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); @@ -1593,7 +1593,6 @@ 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; @@ -1631,10 +1630,7 @@ 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; @@ -1684,8 +1680,6 @@ 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)); @@ -1791,10 +1785,7 @@ 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; diff --git a/http.h b/http.h index 49afe39..4f97b60 100644 --- a/http.h +++ b/http.h @@ -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; };
-- 2.4.2.691.g714732c-twtrsrc
