mirror of
https://github.com/git/git
synced 2024-08-25 02:35:46 +00:00
![Shawn O. Pearce](/assets/img/avatar_default.png)
Requests for $GIT_URL/git-receive-pack and $GIT_URL/git-upload-pack are forwarded to the corresponding backend process by directly executing it and leaving stdin and stdout connected to the invoking web server. Prior to starting the backend process the HTTP response headers are sent, thereby freeing the backend from needing to know about the HTTP protocol. Requests that are encoded with Content-Encoding: gzip are automatically inflated before being streamed into the backend. This is primarily useful for the git-upload-pack backend, which receives highly repetitive text data from clients that easily compresses to 50% of its original size. Signed-off-by: Shawn O. Pearce <spearce@spearce.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
608 lines
13 KiB
C
608 lines
13 KiB
C
#include "cache.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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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 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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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 },
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{ "receive-pack", "receivepack", -1 },
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};
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static int decode_char(const char *q)
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{
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int i;
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unsigned char val = 0;
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for (i = 0; i < 2; i++) {
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unsigned char c = *q++;
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val <<= 4;
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if (c >= '0' && c <= '9')
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val += c - '0';
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else if (c >= 'a' && c <= 'f')
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val += c - 'a' + 10;
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else if (c >= 'A' && c <= 'F')
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val += c - 'A' + 10;
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else
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return -1;
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}
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return val;
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}
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static char *decode_parameter(const char **query, int is_name)
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{
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const char *q = *query;
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struct strbuf out;
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strbuf_init(&out, 16);
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do {
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unsigned char c = *q;
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if (!c)
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break;
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if (c == '&' || (is_name && c == '=')) {
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q++;
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break;
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}
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if (c == '%') {
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int val = decode_char(q + 1);
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if (0 <= val) {
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strbuf_addch(&out, val);
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q += 3;
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continue;
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}
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}
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if (c == '+')
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strbuf_addch(&out, ' ');
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else
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strbuf_addch(&out, c);
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q++;
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} while (1);
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*query = q;
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return strbuf_detach(&out, NULL);
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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 = decode_parameter(&query, 1);
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char *value = decode_parameter(&query, 0);
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struct string_list_item *i;
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i = string_list_lookup(name, query_params);
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if (!i)
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i = string_list_insert(name, query_params);
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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(name, get_parameters());
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return i ? i->util : NULL;
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}
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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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safe_write(fd, buffer, n);
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}
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static void http_status(unsigned code, const char *msg)
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{
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format_write(1, "Status: %u %s\r\n", code, msg);
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}
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static void hdr_str(const char *name, const char *value)
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{
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format_write(1, "%s: %s\r\n", name, value);
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}
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static void hdr_int(const char *name, size_t value)
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{
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format_write(1, "%s: %" PRIuMAX "\r\n", name, value);
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}
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static void hdr_date(const char *name, unsigned long when)
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{
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const char *value = show_date(when, 0, DATE_RFC2822);
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hdr_str(name, value);
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}
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static void hdr_nocache(void)
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{
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hdr_str("Expires", "Fri, 01 Jan 1980 00:00:00 GMT");
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hdr_str("Pragma", "no-cache");
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hdr_str("Cache-Control", "no-cache, max-age=0, must-revalidate");
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}
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static void hdr_cache_forever(void)
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{
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unsigned long now = time(NULL);
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hdr_date("Date", now);
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hdr_date("Expires", now + 31536000);
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hdr_str("Cache-Control", "public, max-age=31536000");
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}
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static void end_headers(void)
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{
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safe_write(1, "\r\n", 2);
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}
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static NORETURN void not_found(const char *err, ...)
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{
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va_list params;
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http_status(404, "Not Found");
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hdr_nocache();
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end_headers();
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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 NORETURN void forbidden(const char *err, ...)
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{
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va_list params;
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http_status(403, "Forbidden");
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hdr_nocache();
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end_headers();
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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 send_strbuf(const char *type, struct strbuf *buf)
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{
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hdr_int(content_length, buf->len);
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hdr_str(content_type, type);
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end_headers();
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safe_write(1, buf->buf, buf->len);
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}
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static void send_file(const char *the_type, const char *name)
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{
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const char *p = git_path("%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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size_t size;
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fd = open(p, O_RDONLY);
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if (fd < 0)
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not_found("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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size = xsize_t(sb.st_size);
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hdr_int(content_length, size);
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hdr_str(content_type, the_type);
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hdr_date(last_modified, sb.st_mtime);
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end_headers();
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while (size) {
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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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safe_write(1, buf, n);
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}
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close(fd);
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free(buf);
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}
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static void get_text_file(char *name)
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{
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hdr_nocache();
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send_file("text/plain", name);
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}
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static void get_loose_object(char *name)
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{
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hdr_cache_forever();
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send_file("application/x-git-loose-object", name);
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}
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static void get_pack_file(char *name)
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{
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hdr_cache_forever();
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send_file("application/x-git-packed-objects", name);
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}
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static void get_idx_file(char *name)
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{
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hdr_cache_forever();
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send_file("application/x-git-packed-objects-toc", name);
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}
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static int http_config(const char *var, const char *value, void *cb)
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{
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struct rpc_service *svc = cb;
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if (!prefixcmp(var, "http.") &&
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!strcmp(var + 5, svc->config_name)) {
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svc->enabled = git_config_bool(var, value);
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return 0;
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}
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/* we are not interested in parsing any other configuration here */
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return 0;
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}
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static struct rpc_service *select_service(const char *name)
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{
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struct rpc_service *svc = NULL;
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int i;
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if (prefixcmp(name, "git-"))
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forbidden("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, name + 4)) {
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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("Unsupported service: '%s'", name);
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git_config(http_config, svc);
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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("Service not enabled: '%s'", svc->name);
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return svc;
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}
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static void inflate_request(const char *prog_name, int out)
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{
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z_stream stream;
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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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int ret;
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memset(&stream, 0, sizeof(stream));
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ret = inflateInit2(&stream, (15 + 16));
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if (ret != Z_OK)
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die("cannot start zlib inflater, zlib err %d", ret);
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while (1) {
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ssize_t n = xread(0, in_buf, sizeof(in_buf));
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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.next_in = in_buf;
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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 = 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) != n)
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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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inflateEnd(&stream);
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close(out);
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}
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static void run_service(const char **argv)
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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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char *env[3];
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struct strbuf buf = STRBUF_INIT;
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int gzipped_request = 0;
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struct child_process cld;
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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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memset(&env, 0, sizeof(env));
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strbuf_addf(&buf, "GIT_COMMITTER_NAME=%s", user);
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env[0] = strbuf_detach(&buf, NULL);
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strbuf_addf(&buf, "GIT_COMMITTER_EMAIL=%s@http.%s", user, host);
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env[1] = strbuf_detach(&buf, NULL);
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env[2] = NULL;
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memset(&cld, 0, sizeof(cld));
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cld.argv = argv;
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cld.env = (const char *const *)env;
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if (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);
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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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free(env[0]);
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free(env[1]);
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strbuf_release(&buf);
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}
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static int show_text_ref(const char *name, const unsigned char *sha1,
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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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struct object *o = parse_object(sha1);
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if (!o)
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return 0;
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strbuf_addf(buf, "%s\t%s\n", sha1_to_hex(sha1), name);
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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", sha1_to_hex(o->sha1), name);
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}
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return 0;
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}
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static void get_info_refs(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();
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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(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(content_type, buf.buf);
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end_headers();
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packet_write(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);
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} else {
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for_each_ref(show_text_ref, &buf);
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send_strbuf("text/plain", &buf);
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}
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strbuf_release(&buf);
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}
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static void get_info_packs(char *arg)
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{
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size_t objdirlen = strlen(get_object_directory());
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struct strbuf buf = STRBUF_INIT;
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struct packed_git *p;
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size_t cnt = 0;
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prepare_packed_git();
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for (p = packed_git; p; p = p->next) {
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if (p->pack_local)
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cnt++;
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}
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strbuf_grow(&buf, cnt * 53 + 2);
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for (p = packed_git; p; p = p->next) {
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if (p->pack_local)
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strbuf_addf(&buf, "P %s\n", p->pack_name + objdirlen + 6);
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}
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strbuf_addch(&buf, '\n');
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hdr_nocache();
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send_strbuf("text/plain; charset=utf-8", &buf);
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strbuf_release(&buf);
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}
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static void check_content_type(const char *accepted_type)
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{
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const char *actual_type = getenv("CONTENT_TYPE");
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if (!actual_type)
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actual_type = "";
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if (strcmp(actual_type, accepted_type)) {
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http_status(415, "Unsupported Media Type");
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hdr_nocache();
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end_headers();
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format_write(1,
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"Expected POST with Content-Type '%s',"
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" but received '%s' instead.\n",
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accepted_type, actual_type);
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exit(0);
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}
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}
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static void service_rpc(char *service_name)
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{
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const char *argv[] = {NULL, "--stateless-rpc", ".", NULL};
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struct rpc_service *svc = select_service(service_name);
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struct strbuf buf = STRBUF_INIT;
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strbuf_reset(&buf);
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strbuf_addf(&buf, "application/x-git-%s-request", svc->name);
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check_content_type(buf.buf);
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hdr_nocache();
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strbuf_reset(&buf);
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strbuf_addf(&buf, "application/x-git-%s-result", svc->name);
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hdr_str(content_type, buf.buf);
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end_headers();
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argv[0] = svc->name;
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run_service(argv);
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strbuf_release(&buf);
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}
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static NORETURN void die_webcgi(const char *err, va_list params)
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{
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char buffer[1000];
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http_status(500, "Internal Server Error");
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hdr_nocache();
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end_headers();
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vsnprintf(buffer, sizeof(buffer), err, params);
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fprintf(stderr, "fatal: %s\n", buffer);
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exit(0);
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}
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static struct service_cmd {
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const char *method;
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const char *pattern;
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void (*imp)(char *);
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} services[] = {
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{"GET", "/HEAD$", get_text_file},
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{"GET", "/info/refs$", get_info_refs},
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{"GET", "/objects/info/alternates$", get_text_file},
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{"GET", "/objects/info/http-alternates$", get_text_file},
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{"GET", "/objects/info/packs$", get_info_packs},
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{"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}
|
|
};
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
char *method = getenv("REQUEST_METHOD");
|
|
char *dir = getenv("PATH_TRANSLATED");
|
|
struct service_cmd *cmd = NULL;
|
|
char *cmd_arg = NULL;
|
|
int i;
|
|
|
|
git_extract_argv0_path(argv[0]);
|
|
set_die_routine(die_webcgi);
|
|
|
|
if (!method)
|
|
die("No REQUEST_METHOD from server");
|
|
if (!strcmp(method, "HEAD"))
|
|
method = "GET";
|
|
if (!dir)
|
|
die("No PATH_TRANSLATED from server");
|
|
|
|
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 = out[0].rm_eo - out[0].rm_so;
|
|
|
|
if (strcmp(method, c->method)) {
|
|
const char *proto = getenv("SERVER_PROTOCOL");
|
|
if (proto && !strcmp(proto, "HTTP/1.1"))
|
|
http_status(405, "Method Not Allowed");
|
|
else
|
|
http_status(400, "Bad Request");
|
|
hdr_nocache();
|
|
end_headers();
|
|
return 0;
|
|
}
|
|
|
|
cmd = c;
|
|
cmd_arg = xmalloc(n);
|
|
strncpy(cmd_arg, dir + out[0].rm_so + 1, n);
|
|
cmd_arg[n] = '\0';
|
|
dir[out[0].rm_so] = 0;
|
|
break;
|
|
}
|
|
regfree(&re);
|
|
}
|
|
|
|
if (!cmd)
|
|
not_found("Request not supported: '%s'", dir);
|
|
|
|
setup_path();
|
|
if (!enter_repo(dir, 0))
|
|
not_found("Not a git repository: '%s'", dir);
|
|
|
|
cmd->imp(cmd_arg);
|
|
return 0;
|
|
}
|