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Diffstat (limited to 'remote-curl.c')
-rw-r--r--remote-curl.c280
1 files changed, 276 insertions, 4 deletions
diff --git a/remote-curl.c b/remote-curl.c
index a7c4c9b..4f779ee 100644
--- a/remote-curl.c
+++ b/remote-curl.c
@@ -1,6 +1,7 @@
#include "cache.h"
#include "config.h"
#include "remote.h"
+#include "connect.h"
#include "strbuf.h"
#include "walker.h"
#include "http.h"
@@ -13,6 +14,7 @@
#include "credential.h"
#include "sha1-array.h"
#include "send-pack.h"
+#include "protocol.h"
#include "quote.h"
static struct remote *remote;
@@ -184,12 +186,13 @@ static int set_option(const char *name, const char *value)
}
struct discovery {
- const char *service;
+ char *service;
char *buf_alloc;
char *buf;
size_t len;
struct ref *refs;
struct oid_array shallow;
+ enum protocol_version version;
unsigned proto_git : 1;
};
static struct discovery *last_discovery;
@@ -197,8 +200,31 @@ static struct discovery *last_discovery;
static struct ref *parse_git_refs(struct discovery *heads, int for_push)
{
struct ref *list = NULL;
- get_remote_heads(-1, heads->buf, heads->len, &list,
- for_push ? REF_NORMAL : 0, NULL, &heads->shallow);
+ struct packet_reader reader;
+
+ packet_reader_init(&reader, -1, heads->buf, heads->len,
+ PACKET_READ_CHOMP_NEWLINE |
+ PACKET_READ_GENTLE_ON_EOF);
+
+ heads->version = discover_version(&reader);
+ switch (heads->version) {
+ case protocol_v2:
+ /*
+ * Do nothing. This isn't a list of refs but rather a
+ * capability advertisement. Client would have run
+ * 'stateless-connect' so we'll dump this capability listing
+ * and let them request the refs themselves.
+ */
+ break;
+ case protocol_v1:
+ case protocol_v0:
+ get_remote_heads(&reader, &list, for_push ? REF_NORMAL : 0,
+ NULL, &heads->shallow);
+ break;
+ case protocol_unknown_version:
+ BUG("unknown protocol version");
+ }
+
return list;
}
@@ -259,6 +285,7 @@ static void free_discovery(struct discovery *d)
free(d->shallow.oid);
free(d->buf_alloc);
free_refs(d->refs);
+ free(d->service);
free(d);
}
}
@@ -290,6 +317,19 @@ static int show_http_message(struct strbuf *type, struct strbuf *charset,
return 0;
}
+static int get_protocol_http_header(enum protocol_version version,
+ struct strbuf *header)
+{
+ if (version > 0) {
+ strbuf_addf(header, GIT_PROTOCOL_HEADER ": version=%d",
+ version);
+
+ return 1;
+ }
+
+ return 0;
+}
+
static struct discovery *discover_refs(const char *service, int for_push)
{
struct strbuf exp = STRBUF_INIT;
@@ -298,9 +338,12 @@ static struct discovery *discover_refs(const char *service, int for_push)
struct strbuf buffer = STRBUF_INIT;
struct strbuf refs_url = STRBUF_INIT;
struct strbuf effective_url = STRBUF_INIT;
+ struct strbuf protocol_header = STRBUF_INIT;
+ struct string_list extra_headers = STRING_LIST_INIT_DUP;
struct discovery *last = last_discovery;
int http_ret, maybe_smart = 0;
struct http_get_options http_options;
+ enum protocol_version version = get_protocol_version_config();
if (last && !strcmp(service, last->service))
return last;
@@ -317,11 +360,24 @@ static struct discovery *discover_refs(const char *service, int for_push)
strbuf_addf(&refs_url, "service=%s", service);
}
+ /*
+ * NEEDSWORK: If we are trying to use protocol v2 and we are planning
+ * to perform a push, then fallback to v0 since the client doesn't know
+ * how to push yet using v2.
+ */
+ if (version == protocol_v2 && !strcmp("git-receive-pack", service))
+ version = protocol_v0;
+
+ /* Add the extra Git-Protocol header */
+ if (get_protocol_http_header(version, &protocol_header))
+ string_list_append(&extra_headers, protocol_header.buf);
+
memset(&http_options, 0, sizeof(http_options));
http_options.content_type = &type;
http_options.charset = &charset;
http_options.effective_url = &effective_url;
http_options.base_url = &url;
+ http_options.extra_headers = &extra_headers;
http_options.initial_request = 1;
http_options.no_cache = 1;
http_options.keep_error = 1;
@@ -345,7 +401,7 @@ static struct discovery *discover_refs(const char *service, int for_push)
warning(_("redirecting to %s"), url.buf);
last= xcalloc(1, sizeof(*last_discovery));
- last->service = service;
+ last->service = xstrdup(service);
last->buf_alloc = strbuf_detach(&buffer, &last->len);
last->buf = last->buf_alloc;
@@ -377,6 +433,9 @@ static struct discovery *discover_refs(const char *service, int for_push)
;
last->proto_git = 1;
+ } else if (maybe_smart &&
+ last->len > 5 && starts_with(last->buf + 4, "version 2")) {
+ last->proto_git = 1;
}
if (last->proto_git)
@@ -390,6 +449,8 @@ static struct discovery *discover_refs(const char *service, int for_push)
strbuf_release(&charset);
strbuf_release(&effective_url);
strbuf_release(&buffer);
+ strbuf_release(&protocol_header);
+ string_list_clear(&extra_headers, 0);
last_discovery = last;
return last;
}
@@ -426,6 +487,7 @@ struct rpc_state {
char *service_url;
char *hdr_content_type;
char *hdr_accept;
+ char *protocol_header;
char *buf;
size_t alloc;
size_t len;
@@ -612,6 +674,10 @@ static int post_rpc(struct rpc_state *rpc)
headers = curl_slist_append(headers, needs_100_continue ?
"Expect: 100-continue" : "Expect:");
+ /* Add the extra Git-Protocol header */
+ if (rpc->protocol_header)
+ headers = curl_slist_append(headers, rpc->protocol_header);
+
retry:
slot = get_active_slot();
@@ -752,6 +818,11 @@ static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
rpc->hdr_accept = strbuf_detach(&buf, NULL);
+ if (get_protocol_http_header(heads->version, &buf))
+ rpc->protocol_header = strbuf_detach(&buf, NULL);
+ else
+ rpc->protocol_header = NULL;
+
while (!err) {
int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
if (!n)
@@ -779,6 +850,7 @@ static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
free(rpc->service_url);
free(rpc->hdr_content_type);
free(rpc->hdr_accept);
+ free(rpc->protocol_header);
free(rpc->buf);
strbuf_release(&buf);
return err;
@@ -1056,6 +1128,202 @@ static void parse_push(struct strbuf *buf)
free(specs);
}
+/*
+ * Used to represent the state of a connection to an HTTP server when
+ * communicating using git's wire-protocol version 2.
+ */
+struct proxy_state {
+ char *service_name;
+ char *service_url;
+ struct curl_slist *headers;
+ struct strbuf request_buffer;
+ int in;
+ int out;
+ struct packet_reader reader;
+ size_t pos;
+ int seen_flush;
+};
+
+static void proxy_state_init(struct proxy_state *p, const char *service_name,
+ enum protocol_version version)
+{
+ struct strbuf buf = STRBUF_INIT;
+
+ memset(p, 0, sizeof(*p));
+ p->service_name = xstrdup(service_name);
+
+ p->in = 0;
+ p->out = 1;
+ strbuf_init(&p->request_buffer, 0);
+
+ strbuf_addf(&buf, "%s%s", url.buf, p->service_name);
+ p->service_url = strbuf_detach(&buf, NULL);
+
+ p->headers = http_copy_default_headers();
+
+ strbuf_addf(&buf, "Content-Type: application/x-%s-request", p->service_name);
+ p->headers = curl_slist_append(p->headers, buf.buf);
+ strbuf_reset(&buf);
+
+ strbuf_addf(&buf, "Accept: application/x-%s-result", p->service_name);
+ p->headers = curl_slist_append(p->headers, buf.buf);
+ strbuf_reset(&buf);
+
+ p->headers = curl_slist_append(p->headers, "Transfer-Encoding: chunked");
+
+ /* Add the Git-Protocol header */
+ if (get_protocol_http_header(version, &buf))
+ p->headers = curl_slist_append(p->headers, buf.buf);
+
+ packet_reader_init(&p->reader, p->in, NULL, 0,
+ PACKET_READ_GENTLE_ON_EOF);
+
+ strbuf_release(&buf);
+}
+
+static void proxy_state_clear(struct proxy_state *p)
+{
+ free(p->service_name);
+ free(p->service_url);
+ curl_slist_free_all(p->headers);
+ strbuf_release(&p->request_buffer);
+}
+
+/*
+ * CURLOPT_READFUNCTION callback function.
+ * Attempts to copy over a single packet-line at a time into the
+ * curl provided buffer.
+ */
+static size_t proxy_in(char *buffer, size_t eltsize,
+ size_t nmemb, void *userdata)
+{
+ size_t max;
+ struct proxy_state *p = userdata;
+ size_t avail = p->request_buffer.len - p->pos;
+
+
+ if (eltsize != 1)
+ BUG("curl read callback called with size = %"PRIuMAX" != 1",
+ (uintmax_t)eltsize);
+ max = nmemb;
+
+ if (!avail) {
+ if (p->seen_flush) {
+ p->seen_flush = 0;
+ return 0;
+ }
+
+ strbuf_reset(&p->request_buffer);
+ switch (packet_reader_read(&p->reader)) {
+ case PACKET_READ_EOF:
+ die("unexpected EOF when reading from parent process");
+ case PACKET_READ_NORMAL:
+ packet_buf_write_len(&p->request_buffer, p->reader.line,
+ p->reader.pktlen);
+ break;
+ case PACKET_READ_DELIM:
+ packet_buf_delim(&p->request_buffer);
+ break;
+ case PACKET_READ_FLUSH:
+ packet_buf_flush(&p->request_buffer);
+ p->seen_flush = 1;
+ break;
+ }
+ p->pos = 0;
+ avail = p->request_buffer.len;
+ }
+
+ if (max < avail)
+ avail = max;
+ memcpy(buffer, p->request_buffer.buf + p->pos, avail);
+ p->pos += avail;
+ return avail;
+}
+
+static size_t proxy_out(char *buffer, size_t eltsize,
+ size_t nmemb, void *userdata)
+{
+ size_t size;
+ struct proxy_state *p = userdata;
+
+ if (eltsize != 1)
+ BUG("curl read callback called with size = %"PRIuMAX" != 1",
+ (uintmax_t)eltsize);
+ size = nmemb;
+
+ write_or_die(p->out, buffer, size);
+ return size;
+}
+
+/* Issues a request to the HTTP server configured in `p` */
+static int proxy_request(struct proxy_state *p)
+{
+ struct active_request_slot *slot;
+
+ slot = get_active_slot();
+
+ curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
+ curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
+ curl_easy_setopt(slot->curl, CURLOPT_URL, p->service_url);
+ curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, p->headers);
+
+ /* Setup function to read request from client */
+ curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, proxy_in);
+ curl_easy_setopt(slot->curl, CURLOPT_READDATA, p);
+
+ /* Setup function to write server response to client */
+ curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, proxy_out);
+ curl_easy_setopt(slot->curl, CURLOPT_WRITEDATA, p);
+
+ if (run_slot(slot, NULL) != HTTP_OK)
+ return -1;
+
+ return 0;
+}
+
+static int stateless_connect(const char *service_name)
+{
+ struct discovery *discover;
+ struct proxy_state p;
+
+ /*
+ * Run the info/refs request and see if the server supports protocol
+ * v2. If and only if the server supports v2 can we successfully
+ * establish a stateless connection, otherwise we need to tell the
+ * client to fallback to using other transport helper functions to
+ * complete their request.
+ */
+ discover = discover_refs(service_name, 0);
+ if (discover->version != protocol_v2) {
+ printf("fallback\n");
+ fflush(stdout);
+ return -1;
+ } else {
+ /* Stateless Connection established */
+ printf("\n");
+ fflush(stdout);
+ }
+
+ proxy_state_init(&p, service_name, discover->version);
+
+ /*
+ * Dump the capability listing that we got from the server earlier
+ * during the info/refs request.
+ */
+ write_or_die(p.out, discover->buf, discover->len);
+
+ /* Peek the next packet line. Until we see EOF keep sending POSTs */
+ while (packet_reader_peek(&p.reader) != PACKET_READ_EOF) {
+ if (proxy_request(&p)) {
+ /* We would have an err here */
+ break;
+ }
+ }
+
+ proxy_state_clear(&p);
+ return 0;
+}
+
int cmd_main(int argc, const char **argv)
{
struct strbuf buf = STRBUF_INIT;
@@ -1124,12 +1392,16 @@ int cmd_main(int argc, const char **argv)
fflush(stdout);
} else if (!strcmp(buf.buf, "capabilities")) {
+ printf("stateless-connect\n");
printf("fetch\n");
printf("option\n");
printf("push\n");
printf("check-connectivity\n");
printf("\n");
fflush(stdout);
+ } else if (skip_prefix(buf.buf, "stateless-connect ", &arg)) {
+ if (!stateless_connect(arg))
+ break;
} else {
error("remote-curl: unknown command '%s' from git", buf.buf);
return 1;