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![Jeff King](/assets/img/avatar_default.png)
The return value of write_in_full() is either "-1", or the requested number of bytes[1]. If we make a partial write before seeing an error, we still return -1, not a partial value. This goes back tof6aa66cb95
(write_in_full: really write in full or return error on disk full., 2007-01-11). So checking anything except "was the return value negative" is pointless. And there are a couple of reasons not to do so: 1. It can do a funny signed/unsigned comparison. If your "len" is signed (e.g., a size_t) then the compiler will promote the "-1" to its unsigned variant. This works out for "!= len" (unless you really were trying to write the maximum size_t bytes), but is a bug if you check "< len" (an example of which was fixed recently in config.c). We should avoid promoting the mental model that you need to check the length at all, so that new sites are not tempted to copy us. 2. Checking for a negative value is shorter to type, especially when the length is an expression. 3. Linus says so. Ind34cf19b89
(Clean up write_in_full() users, 2007-01-11), right after the write_in_full() semantics were changed, he wrote: I really wish every "write_in_full()" user would just check against "<0" now, but this fixes the nasty and stupid ones. Appeals to authority aside, this makes it clear that writing it this way does not have an intentional benefit. It's a historical curiosity that we never bothered to clean up (and which was undoubtedly cargo-culted into new sites). So let's convert these obviously-correct cases (this includes write_str_in_full(), which is just a wrapper for write_in_full()). [1] A careful reader may notice there is one way that write_in_full() can return a different value. If we ask write() to write N bytes and get a return value that is _larger_ than N, we could return a larger total. But besides the fact that this would imply a totally broken version of write(), it would already invoke undefined behavior. Our internal remaining counter is an unsigned size_t, which means that subtracting too many byte will wrap it around to a very large number. So we'll instantly begin reading off the end of the buffer, trying to write gigabytes (or petabytes) of data. Signed-off-by: Jeff King <peff@peff.net> Reviewed-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
714 lines
17 KiB
C
714 lines
17 KiB
C
#include "cache.h"
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#include "config.h"
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#include "refs.h"
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#include "pkt-line.h"
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#include "object.h"
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#include "tag.h"
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#include "exec_cmd.h"
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#include "run-command.h"
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#include "string-list.h"
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#include "url.h"
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#include "argv-array.h"
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static const char content_type[] = "Content-Type";
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static const char content_length[] = "Content-Length";
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static const char last_modified[] = "Last-Modified";
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static int getanyfile = 1;
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static unsigned long max_request_buffer = 10 * 1024 * 1024;
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static struct string_list *query_params;
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struct rpc_service {
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const char *name;
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const char *config_name;
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unsigned buffer_input : 1;
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signed enabled : 2;
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};
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static struct rpc_service rpc_service[] = {
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{ "upload-pack", "uploadpack", 1, 1 },
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{ "receive-pack", "receivepack", 0, -1 },
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};
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static struct string_list *get_parameters(void)
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{
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if (!query_params) {
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const char *query = getenv("QUERY_STRING");
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query_params = xcalloc(1, sizeof(*query_params));
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while (query && *query) {
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char *name = url_decode_parameter_name(&query);
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char *value = url_decode_parameter_value(&query);
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struct string_list_item *i;
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i = string_list_lookup(query_params, name);
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if (!i)
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i = string_list_insert(query_params, name);
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else
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free(i->util);
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i->util = value;
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}
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}
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return query_params;
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}
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static const char *get_parameter(const char *name)
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{
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struct string_list_item *i;
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i = string_list_lookup(get_parameters(), name);
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return i ? i->util : NULL;
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}
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__attribute__((format (printf, 2, 3)))
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static void format_write(int fd, const char *fmt, ...)
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{
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static char buffer[1024];
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va_list args;
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unsigned n;
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va_start(args, fmt);
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n = vsnprintf(buffer, sizeof(buffer), fmt, args);
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va_end(args);
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if (n >= sizeof(buffer))
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die("protocol error: impossibly long line");
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write_or_die(fd, buffer, n);
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}
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static void http_status(struct strbuf *hdr, unsigned code, const char *msg)
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{
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strbuf_addf(hdr, "Status: %u %s\r\n", code, msg);
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}
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static void hdr_str(struct strbuf *hdr, const char *name, const char *value)
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{
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strbuf_addf(hdr, "%s: %s\r\n", name, value);
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}
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static void hdr_int(struct strbuf *hdr, const char *name, uintmax_t value)
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{
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strbuf_addf(hdr, "%s: %" PRIuMAX "\r\n", name, value);
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}
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static void hdr_date(struct strbuf *hdr, const char *name, timestamp_t when)
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{
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const char *value = show_date(when, 0, DATE_MODE(RFC2822));
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hdr_str(hdr, name, value);
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}
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static void hdr_nocache(struct strbuf *hdr)
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{
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hdr_str(hdr, "Expires", "Fri, 01 Jan 1980 00:00:00 GMT");
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hdr_str(hdr, "Pragma", "no-cache");
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hdr_str(hdr, "Cache-Control", "no-cache, max-age=0, must-revalidate");
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}
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static void hdr_cache_forever(struct strbuf *hdr)
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{
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timestamp_t now = time(NULL);
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hdr_date(hdr, "Date", now);
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hdr_date(hdr, "Expires", now + 31536000);
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hdr_str(hdr, "Cache-Control", "public, max-age=31536000");
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}
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static void end_headers(struct strbuf *hdr)
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{
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strbuf_add(hdr, "\r\n", 2);
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write_or_die(1, hdr->buf, hdr->len);
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strbuf_release(hdr);
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}
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__attribute__((format (printf, 2, 3)))
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static NORETURN void not_found(struct strbuf *hdr, const char *err, ...)
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{
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va_list params;
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http_status(hdr, 404, "Not Found");
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hdr_nocache(hdr);
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end_headers(hdr);
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va_start(params, err);
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if (err && *err)
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vfprintf(stderr, err, params);
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va_end(params);
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exit(0);
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}
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__attribute__((format (printf, 2, 3)))
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static NORETURN void forbidden(struct strbuf *hdr, const char *err, ...)
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{
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va_list params;
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http_status(hdr, 403, "Forbidden");
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hdr_nocache(hdr);
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end_headers(hdr);
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va_start(params, err);
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if (err && *err)
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vfprintf(stderr, err, params);
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va_end(params);
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exit(0);
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}
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static void select_getanyfile(struct strbuf *hdr)
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{
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if (!getanyfile)
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forbidden(hdr, "Unsupported service: getanyfile");
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}
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static void send_strbuf(struct strbuf *hdr,
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const char *type, struct strbuf *buf)
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{
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hdr_int(hdr, content_length, buf->len);
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hdr_str(hdr, content_type, type);
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end_headers(hdr);
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write_or_die(1, buf->buf, buf->len);
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}
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static void send_local_file(struct strbuf *hdr, const char *the_type,
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const char *name)
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{
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char *p = git_pathdup("%s", name);
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size_t buf_alloc = 8192;
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char *buf = xmalloc(buf_alloc);
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int fd;
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struct stat sb;
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fd = open(p, O_RDONLY);
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if (fd < 0)
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not_found(hdr, "Cannot open '%s': %s", p, strerror(errno));
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if (fstat(fd, &sb) < 0)
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die_errno("Cannot stat '%s'", p);
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hdr_int(hdr, content_length, sb.st_size);
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hdr_str(hdr, content_type, the_type);
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hdr_date(hdr, last_modified, sb.st_mtime);
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end_headers(hdr);
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for (;;) {
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ssize_t n = xread(fd, buf, buf_alloc);
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if (n < 0)
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die_errno("Cannot read '%s'", p);
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if (!n)
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break;
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write_or_die(1, buf, n);
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}
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close(fd);
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free(buf);
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free(p);
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}
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static void get_text_file(struct strbuf *hdr, char *name)
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{
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select_getanyfile(hdr);
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hdr_nocache(hdr);
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send_local_file(hdr, "text/plain", name);
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}
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static void get_loose_object(struct strbuf *hdr, char *name)
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{
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select_getanyfile(hdr);
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hdr_cache_forever(hdr);
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send_local_file(hdr, "application/x-git-loose-object", name);
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}
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static void get_pack_file(struct strbuf *hdr, char *name)
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{
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select_getanyfile(hdr);
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hdr_cache_forever(hdr);
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send_local_file(hdr, "application/x-git-packed-objects", name);
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}
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static void get_idx_file(struct strbuf *hdr, char *name)
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{
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select_getanyfile(hdr);
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hdr_cache_forever(hdr);
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send_local_file(hdr, "application/x-git-packed-objects-toc", name);
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}
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static void http_config(void)
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{
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int i, value = 0;
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struct strbuf var = STRBUF_INIT;
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git_config_get_bool("http.getanyfile", &getanyfile);
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git_config_get_ulong("http.maxrequestbuffer", &max_request_buffer);
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for (i = 0; i < ARRAY_SIZE(rpc_service); i++) {
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struct rpc_service *svc = &rpc_service[i];
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strbuf_addf(&var, "http.%s", svc->config_name);
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if (!git_config_get_bool(var.buf, &value))
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svc->enabled = value;
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strbuf_reset(&var);
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}
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strbuf_release(&var);
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}
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static struct rpc_service *select_service(struct strbuf *hdr, const char *name)
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{
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const char *svc_name;
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struct rpc_service *svc = NULL;
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int i;
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if (!skip_prefix(name, "git-", &svc_name))
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forbidden(hdr, "Unsupported service: '%s'", name);
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for (i = 0; i < ARRAY_SIZE(rpc_service); i++) {
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struct rpc_service *s = &rpc_service[i];
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if (!strcmp(s->name, svc_name)) {
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svc = s;
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break;
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}
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}
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if (!svc)
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forbidden(hdr, "Unsupported service: '%s'", name);
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if (svc->enabled < 0) {
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const char *user = getenv("REMOTE_USER");
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svc->enabled = (user && *user) ? 1 : 0;
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}
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if (!svc->enabled)
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forbidden(hdr, "Service not enabled: '%s'", svc->name);
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return svc;
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}
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/*
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* This is basically strbuf_read(), except that if we
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* hit max_request_buffer we die (we'd rather reject a
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* maliciously large request than chew up infinite memory).
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*/
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static ssize_t read_request(int fd, unsigned char **out)
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{
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size_t len = 0, alloc = 8192;
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unsigned char *buf = xmalloc(alloc);
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if (max_request_buffer < alloc)
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max_request_buffer = alloc;
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while (1) {
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ssize_t cnt;
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cnt = read_in_full(fd, buf + len, alloc - len);
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if (cnt < 0) {
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free(buf);
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return -1;
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}
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/* partial read from read_in_full means we hit EOF */
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len += cnt;
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if (len < alloc) {
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*out = buf;
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return len;
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}
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/* otherwise, grow and try again (if we can) */
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if (alloc == max_request_buffer)
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die("request was larger than our maximum size (%lu);"
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" try setting GIT_HTTP_MAX_REQUEST_BUFFER",
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max_request_buffer);
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alloc = alloc_nr(alloc);
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if (alloc > max_request_buffer)
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alloc = max_request_buffer;
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REALLOC_ARRAY(buf, alloc);
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}
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}
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static void inflate_request(const char *prog_name, int out, int buffer_input)
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{
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git_zstream stream;
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unsigned char *full_request = NULL;
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unsigned char in_buf[8192];
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unsigned char out_buf[8192];
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unsigned long cnt = 0;
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memset(&stream, 0, sizeof(stream));
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git_inflate_init_gzip_only(&stream);
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while (1) {
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ssize_t n;
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if (buffer_input) {
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if (full_request)
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n = 0; /* nothing left to read */
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else
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n = read_request(0, &full_request);
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stream.next_in = full_request;
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} else {
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n = xread(0, in_buf, sizeof(in_buf));
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stream.next_in = in_buf;
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}
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if (n <= 0)
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die("request ended in the middle of the gzip stream");
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stream.avail_in = n;
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while (0 < stream.avail_in) {
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int ret;
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stream.next_out = out_buf;
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stream.avail_out = sizeof(out_buf);
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ret = git_inflate(&stream, Z_NO_FLUSH);
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if (ret != Z_OK && ret != Z_STREAM_END)
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die("zlib error inflating request, result %d", ret);
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n = stream.total_out - cnt;
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if (write_in_full(out, out_buf, n) < 0)
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die("%s aborted reading request", prog_name);
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cnt += n;
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if (ret == Z_STREAM_END)
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goto done;
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}
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}
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done:
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git_inflate_end(&stream);
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close(out);
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free(full_request);
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}
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static void copy_request(const char *prog_name, int out)
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{
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unsigned char *buf;
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ssize_t n = read_request(0, &buf);
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if (n < 0)
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die_errno("error reading request body");
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if (write_in_full(out, buf, n) < 0)
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die("%s aborted reading request", prog_name);
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close(out);
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free(buf);
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}
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static void run_service(const char **argv, int buffer_input)
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{
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const char *encoding = getenv("HTTP_CONTENT_ENCODING");
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const char *user = getenv("REMOTE_USER");
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const char *host = getenv("REMOTE_ADDR");
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int gzipped_request = 0;
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struct child_process cld = CHILD_PROCESS_INIT;
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if (encoding && !strcmp(encoding, "gzip"))
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gzipped_request = 1;
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else if (encoding && !strcmp(encoding, "x-gzip"))
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gzipped_request = 1;
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if (!user || !*user)
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user = "anonymous";
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if (!host || !*host)
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host = "(none)";
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if (!getenv("GIT_COMMITTER_NAME"))
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argv_array_pushf(&cld.env_array, "GIT_COMMITTER_NAME=%s", user);
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if (!getenv("GIT_COMMITTER_EMAIL"))
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argv_array_pushf(&cld.env_array,
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"GIT_COMMITTER_EMAIL=%s@http.%s", user, host);
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cld.argv = argv;
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if (buffer_input || gzipped_request)
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cld.in = -1;
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cld.git_cmd = 1;
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if (start_command(&cld))
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exit(1);
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close(1);
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if (gzipped_request)
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inflate_request(argv[0], cld.in, buffer_input);
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else if (buffer_input)
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copy_request(argv[0], cld.in);
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else
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close(0);
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if (finish_command(&cld))
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exit(1);
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}
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static int show_text_ref(const char *name, const struct object_id *oid,
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int flag, void *cb_data)
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{
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const char *name_nons = strip_namespace(name);
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struct strbuf *buf = cb_data;
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struct object *o = parse_object(oid);
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if (!o)
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return 0;
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strbuf_addf(buf, "%s\t%s\n", oid_to_hex(oid), name_nons);
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if (o->type == OBJ_TAG) {
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o = deref_tag(o, name, 0);
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if (!o)
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return 0;
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strbuf_addf(buf, "%s\t%s^{}\n", oid_to_hex(&o->oid),
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name_nons);
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}
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return 0;
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}
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static void get_info_refs(struct strbuf *hdr, char *arg)
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{
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const char *service_name = get_parameter("service");
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struct strbuf buf = STRBUF_INIT;
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hdr_nocache(hdr);
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if (service_name) {
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const char *argv[] = {NULL /* service name */,
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"--stateless-rpc", "--advertise-refs",
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".", NULL};
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struct rpc_service *svc = select_service(hdr, service_name);
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strbuf_addf(&buf, "application/x-git-%s-advertisement",
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svc->name);
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hdr_str(hdr, content_type, buf.buf);
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end_headers(hdr);
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packet_write_fmt(1, "# service=git-%s\n", svc->name);
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packet_flush(1);
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argv[0] = svc->name;
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run_service(argv, 0);
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} else {
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select_getanyfile(hdr);
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for_each_namespaced_ref(show_text_ref, &buf);
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send_strbuf(hdr, "text/plain", &buf);
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}
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strbuf_release(&buf);
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}
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static int show_head_ref(const char *refname, const struct object_id *oid,
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int flag, void *cb_data)
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{
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struct strbuf *buf = cb_data;
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if (flag & REF_ISSYMREF) {
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struct object_id unused;
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const char *target = resolve_ref_unsafe(refname,
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RESOLVE_REF_READING,
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unused.hash, NULL);
|
|
|
|
if (target)
|
|
strbuf_addf(buf, "ref: %s\n", strip_namespace(target));
|
|
} else {
|
|
strbuf_addf(buf, "%s\n", oid_to_hex(oid));
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void get_head(struct strbuf *hdr, char *arg)
|
|
{
|
|
struct strbuf buf = STRBUF_INIT;
|
|
|
|
select_getanyfile(hdr);
|
|
head_ref_namespaced(show_head_ref, &buf);
|
|
send_strbuf(hdr, "text/plain", &buf);
|
|
strbuf_release(&buf);
|
|
}
|
|
|
|
static void get_info_packs(struct strbuf *hdr, char *arg)
|
|
{
|
|
size_t objdirlen = strlen(get_object_directory());
|
|
struct strbuf buf = STRBUF_INIT;
|
|
struct packed_git *p;
|
|
size_t cnt = 0;
|
|
|
|
select_getanyfile(hdr);
|
|
prepare_packed_git();
|
|
for (p = packed_git; p; p = p->next) {
|
|
if (p->pack_local)
|
|
cnt++;
|
|
}
|
|
|
|
strbuf_grow(&buf, cnt * 53 + 2);
|
|
for (p = packed_git; p; p = p->next) {
|
|
if (p->pack_local)
|
|
strbuf_addf(&buf, "P %s\n", p->pack_name + objdirlen + 6);
|
|
}
|
|
strbuf_addch(&buf, '\n');
|
|
|
|
hdr_nocache(hdr);
|
|
send_strbuf(hdr, "text/plain; charset=utf-8", &buf);
|
|
strbuf_release(&buf);
|
|
}
|
|
|
|
static void check_content_type(struct strbuf *hdr, const char *accepted_type)
|
|
{
|
|
const char *actual_type = getenv("CONTENT_TYPE");
|
|
|
|
if (!actual_type)
|
|
actual_type = "";
|
|
|
|
if (strcmp(actual_type, accepted_type)) {
|
|
http_status(hdr, 415, "Unsupported Media Type");
|
|
hdr_nocache(hdr);
|
|
end_headers(hdr);
|
|
format_write(1,
|
|
"Expected POST with Content-Type '%s',"
|
|
" but received '%s' instead.\n",
|
|
accepted_type, actual_type);
|
|
exit(0);
|
|
}
|
|
}
|
|
|
|
static void service_rpc(struct strbuf *hdr, char *service_name)
|
|
{
|
|
const char *argv[] = {NULL, "--stateless-rpc", ".", NULL};
|
|
struct rpc_service *svc = select_service(hdr, service_name);
|
|
struct strbuf buf = STRBUF_INIT;
|
|
|
|
strbuf_reset(&buf);
|
|
strbuf_addf(&buf, "application/x-git-%s-request", svc->name);
|
|
check_content_type(hdr, buf.buf);
|
|
|
|
hdr_nocache(hdr);
|
|
|
|
strbuf_reset(&buf);
|
|
strbuf_addf(&buf, "application/x-git-%s-result", svc->name);
|
|
hdr_str(hdr, content_type, buf.buf);
|
|
|
|
end_headers(hdr);
|
|
|
|
argv[0] = svc->name;
|
|
run_service(argv, svc->buffer_input);
|
|
strbuf_release(&buf);
|
|
}
|
|
|
|
static int dead;
|
|
static NORETURN void die_webcgi(const char *err, va_list params)
|
|
{
|
|
if (dead <= 1) {
|
|
struct strbuf hdr = STRBUF_INIT;
|
|
|
|
vreportf("fatal: ", err, params);
|
|
|
|
http_status(&hdr, 500, "Internal Server Error");
|
|
hdr_nocache(&hdr);
|
|
end_headers(&hdr);
|
|
}
|
|
exit(0); /* we successfully reported a failure ;-) */
|
|
}
|
|
|
|
static int die_webcgi_recursing(void)
|
|
{
|
|
return dead++ > 1;
|
|
}
|
|
|
|
static char* getdir(void)
|
|
{
|
|
struct strbuf buf = STRBUF_INIT;
|
|
char *pathinfo = getenv("PATH_INFO");
|
|
char *root = getenv("GIT_PROJECT_ROOT");
|
|
char *path = getenv("PATH_TRANSLATED");
|
|
|
|
if (root && *root) {
|
|
if (!pathinfo || !*pathinfo)
|
|
die("GIT_PROJECT_ROOT is set but PATH_INFO is not");
|
|
if (daemon_avoid_alias(pathinfo))
|
|
die("'%s': aliased", pathinfo);
|
|
end_url_with_slash(&buf, root);
|
|
if (pathinfo[0] == '/')
|
|
pathinfo++;
|
|
strbuf_addstr(&buf, pathinfo);
|
|
return strbuf_detach(&buf, NULL);
|
|
} else if (path && *path) {
|
|
return xstrdup(path);
|
|
} else
|
|
die("No GIT_PROJECT_ROOT or PATH_TRANSLATED from server");
|
|
return NULL;
|
|
}
|
|
|
|
static struct service_cmd {
|
|
const char *method;
|
|
const char *pattern;
|
|
void (*imp)(struct strbuf *, char *);
|
|
} services[] = {
|
|
{"GET", "/HEAD$", get_head},
|
|
{"GET", "/info/refs$", get_info_refs},
|
|
{"GET", "/objects/info/alternates$", get_text_file},
|
|
{"GET", "/objects/info/http-alternates$", get_text_file},
|
|
{"GET", "/objects/info/packs$", get_info_packs},
|
|
{"GET", "/objects/[0-9a-f]{2}/[0-9a-f]{38}$", get_loose_object},
|
|
{"GET", "/objects/pack/pack-[0-9a-f]{40}\\.pack$", get_pack_file},
|
|
{"GET", "/objects/pack/pack-[0-9a-f]{40}\\.idx$", get_idx_file},
|
|
|
|
{"POST", "/git-upload-pack$", service_rpc},
|
|
{"POST", "/git-receive-pack$", service_rpc}
|
|
};
|
|
|
|
static int bad_request(struct strbuf *hdr, const struct service_cmd *c)
|
|
{
|
|
const char *proto = getenv("SERVER_PROTOCOL");
|
|
|
|
if (proto && !strcmp(proto, "HTTP/1.1")) {
|
|
http_status(hdr, 405, "Method Not Allowed");
|
|
hdr_str(hdr, "Allow",
|
|
!strcmp(c->method, "GET") ? "GET, HEAD" : c->method);
|
|
} else
|
|
http_status(hdr, 400, "Bad Request");
|
|
hdr_nocache(hdr);
|
|
end_headers(hdr);
|
|
return 0;
|
|
}
|
|
|
|
int cmd_main(int argc, const char **argv)
|
|
{
|
|
char *method = getenv("REQUEST_METHOD");
|
|
char *dir;
|
|
struct service_cmd *cmd = NULL;
|
|
char *cmd_arg = NULL;
|
|
int i;
|
|
struct strbuf hdr = STRBUF_INIT;
|
|
|
|
set_die_routine(die_webcgi);
|
|
set_die_is_recursing_routine(die_webcgi_recursing);
|
|
|
|
if (!method)
|
|
die("No REQUEST_METHOD from server");
|
|
if (!strcmp(method, "HEAD"))
|
|
method = "GET";
|
|
dir = getdir();
|
|
|
|
for (i = 0; i < ARRAY_SIZE(services); i++) {
|
|
struct service_cmd *c = &services[i];
|
|
regex_t re;
|
|
regmatch_t out[1];
|
|
|
|
if (regcomp(&re, c->pattern, REG_EXTENDED))
|
|
die("Bogus regex in service table: %s", c->pattern);
|
|
if (!regexec(&re, dir, 1, out, 0)) {
|
|
size_t n;
|
|
|
|
if (strcmp(method, c->method))
|
|
return bad_request(&hdr, c);
|
|
|
|
cmd = c;
|
|
n = out[0].rm_eo - out[0].rm_so;
|
|
cmd_arg = xmemdupz(dir + out[0].rm_so + 1, n - 1);
|
|
dir[out[0].rm_so] = 0;
|
|
break;
|
|
}
|
|
regfree(&re);
|
|
}
|
|
|
|
if (!cmd)
|
|
not_found(&hdr, "Request not supported: '%s'", dir);
|
|
|
|
setup_path();
|
|
if (!enter_repo(dir, 0))
|
|
not_found(&hdr, "Not a git repository: '%s'", dir);
|
|
if (!getenv("GIT_HTTP_EXPORT_ALL") &&
|
|
access("git-daemon-export-ok", F_OK) )
|
|
not_found(&hdr, "Repository not exported: '%s'", dir);
|
|
|
|
http_config();
|
|
max_request_buffer = git_env_ulong("GIT_HTTP_MAX_REQUEST_BUFFER",
|
|
max_request_buffer);
|
|
|
|
cmd->imp(&hdr, cmd_arg);
|
|
return 0;
|
|
}
|