From fe7e44e1ab7dc1b39757a4bffdc577ed2755beb6 Mon Sep 17 00:00:00 2001 From: Jeff King Date: Mon, 16 Jan 2023 22:04:44 -0500 Subject: http: prefer CURLOPT_SEEKFUNCTION to CURLOPT_IOCTLFUNCTION The IOCTLFUNCTION option has been deprecated, and generates a compiler warning in recent versions of curl. We can switch to using SEEKFUNCTION instead. It was added in 2008 via curl 7.18.0; our INSTALL file already indicates we require at least curl 7.19.4. But there's one catch: curl says we should use CURL_SEEKFUNC_{OK,FAIL}, and those didn't arrive until 7.19.5. One workaround would be to use a bare 0/1 here (or define our own macros). But let's just bump the minimum required version to 7.19.5. That version is only a minor version bump from our existing requirement, and is only a 2 month time bump for versions that are almost 13 years old. So it's not likely that anybody cares about the distinction. Switching means we have to rewrite the ioctl functions into seek functions. In some ways they are simpler (seeking is the only operation), but in some ways more complex (the ioctl allowed only a full rewind, but now we can seek to arbitrary offsets). Curl will only ever use SEEK_SET (per their documentation), so I didn't bother implementing anything else, since it would naturally be completely untested. This seems unlikely to change, but I added an assertion just in case. Likewise, I doubt curl will ever try to seek outside of the buffer sizes we've told it, but I erred on the defensive side here, rather than do an out-of-bounds read. Signed-off-by: Jeff King Signed-off-by: Junio C Hamano --- remote-curl.c | 28 +++++++++++++--------------- 1 file changed, 13 insertions(+), 15 deletions(-) (limited to 'remote-curl.c') diff --git a/remote-curl.c b/remote-curl.c index 72dfb8fb86..a76b6405eb 100644 --- a/remote-curl.c +++ b/remote-curl.c @@ -717,25 +717,23 @@ static size_t rpc_out(void *ptr, size_t eltsize, return avail; } -static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp) +static int rpc_seek(void *clientp, curl_off_t offset, int origin) { struct rpc_state *rpc = clientp; - switch (cmd) { - case CURLIOCMD_NOP: - return CURLIOE_OK; + if (origin != SEEK_SET) + BUG("rpc_seek only handles SEEK_SET, not %d", origin); - case CURLIOCMD_RESTARTREAD: - if (rpc->initial_buffer) { - rpc->pos = 0; - return CURLIOE_OK; + if (rpc->initial_buffer) { + if (offset < 0 || offset > rpc->len) { + error("curl seek would be outside of rpc buffer"); + return CURL_SEEKFUNC_FAIL; } - error(_("unable to rewind rpc post data - try increasing http.postBuffer")); - return CURLIOE_FAILRESTART; - - default: - return CURLIOE_UNKNOWNCMD; + rpc->pos = offset; + return CURL_SEEKFUNC_OK; } + error(_("unable to rewind rpc post data - try increasing http.postBuffer")); + return CURL_SEEKFUNC_FAIL; } struct check_pktline_state { @@ -959,8 +957,8 @@ retry: rpc->initial_buffer = 1; curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out); curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc); - curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl); - curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc); + curl_easy_setopt(slot->curl, CURLOPT_SEEKFUNCTION, rpc_seek); + curl_easy_setopt(slot->curl, CURLOPT_SEEKDATA, rpc); if (options.verbosity > 1) { fprintf(stderr, "POST %s (chunked)\n", rpc->service_name); fflush(stderr); -- cgit v1.2.3