#include "sha1-array.h"
#include "transport.h"
#include "strbuf.h"
+#include "version.h"
#include "protocol.h"
+#include "alias.h"
-static char *server_capabilities;
+static char *server_capabilities_v1;
+static struct argv_array server_capabilities_v2 = ARGV_ARRAY_INIT;
static const char *parse_feature_value(const char *, const char *, int *);
static int check_ref(const char *name, unsigned int flags)
return check_ref(ref->name, flags);
}
-static void die_initial_contact(int unexpected)
+static NORETURN void die_initial_contact(int unexpected)
{
+ /*
+ * A hang-up after seeing some response from the other end
+ * means that it is unexpected, as we know the other end is
+ * willing to talk to us. A hang-up before seeing any
+ * response does not necessarily mean an ACL problem, though.
+ */
if (unexpected)
die(_("The remote end hung up upon initial contact"));
else
"and the repository exists."));
}
+/* Checks if the server supports the capability 'c' */
+int server_supports_v2(const char *c, int die_on_error)
+{
+ int i;
+
+ for (i = 0; i < server_capabilities_v2.argc; i++) {
+ const char *out;
+ if (skip_prefix(server_capabilities_v2.argv[i], c, &out) &&
+ (!*out || *out == '='))
+ return 1;
+ }
+
+ if (die_on_error)
+ die("server doesn't support '%s'", c);
+
+ return 0;
+}
+
+int server_supports_feature(const char *c, const char *feature,
+ int die_on_error)
+{
+ int i;
+
+ for (i = 0; i < server_capabilities_v2.argc; i++) {
+ const char *out;
+ if (skip_prefix(server_capabilities_v2.argv[i], c, &out) &&
+ (!*out || *(out++) == '=')) {
+ if (parse_feature_request(out, feature))
+ return 1;
+ else
+ break;
+ }
+ }
+
+ if (die_on_error)
+ die("server doesn't support feature '%s'", feature);
+
+ return 0;
+}
+
+static void process_capabilities_v2(struct packet_reader *reader)
+{
+ while (packet_reader_read(reader) == PACKET_READ_NORMAL)
+ argv_array_push(&server_capabilities_v2, reader->line);
+
+ if (reader->status != PACKET_READ_FLUSH)
+ die("expected flush after capabilities");
+}
+
+enum protocol_version discover_version(struct packet_reader *reader)
+{
+ enum protocol_version version = protocol_unknown_version;
+
+ /*
+ * Peek the first line of the server's response to
+ * determine the protocol version the server is speaking.
+ */
+ switch (packet_reader_peek(reader)) {
+ case PACKET_READ_EOF:
+ die_initial_contact(0);
+ case PACKET_READ_FLUSH:
+ case PACKET_READ_DELIM:
+ version = protocol_v0;
+ break;
+ case PACKET_READ_NORMAL:
+ version = determine_protocol_version_client(reader->line);
+ break;
+ }
+
+ switch (version) {
+ case protocol_v2:
+ process_capabilities_v2(reader);
+ break;
+ case protocol_v1:
+ /* Read the peeked version line */
+ packet_reader_read(reader);
+ break;
+ case protocol_v0:
+ break;
+ case protocol_unknown_version:
+ BUG("unknown protocol version");
+ }
+
+ return version;
+}
+
static void parse_one_symref_info(struct string_list *symref, const char *val, int len)
{
char *sym, *target;
static void annotate_refs_with_symref_info(struct ref *ref)
{
struct string_list symref = STRING_LIST_INIT_DUP;
- const char *feature_list = server_capabilities;
+ const char *feature_list = server_capabilities_v1;
while (feature_list) {
int len;
string_list_clear(&symref, 0);
}
-/*
- * Read one line of a server's ref advertisement into packet_buffer.
- */
-static int read_remote_ref(int in, char **src_buf, size_t *src_len,
- int *responded)
+static void process_capabilities(const char *line, int *len)
{
- int len = packet_read(in, src_buf, src_len,
- packet_buffer, sizeof(packet_buffer),
- PACKET_READ_GENTLE_ON_EOF |
- PACKET_READ_CHOMP_NEWLINE);
- const char *arg;
- if (len < 0)
- die_initial_contact(*responded);
- if (len > 4 && skip_prefix(packet_buffer, "ERR ", &arg))
- die("remote error: %s", arg);
-
- *responded = 1;
-
- return len;
-}
-
-#define EXPECTING_PROTOCOL_VERSION 0
-#define EXPECTING_FIRST_REF 1
-#define EXPECTING_REF 2
-#define EXPECTING_SHALLOW 3
-
-/* Returns 1 if packet_buffer is a protocol version pkt-line, 0 otherwise. */
-static int process_protocol_version(void)
-{
- switch (determine_protocol_version_client(packet_buffer)) {
- case protocol_v1:
- return 1;
- case protocol_v0:
- return 0;
- default:
- die("server is speaking an unknown protocol");
- }
-}
-
-static void process_capabilities(int *len)
-{
- int nul_location = strlen(packet_buffer);
+ int nul_location = strlen(line);
if (nul_location == *len)
return;
- server_capabilities = xstrdup(packet_buffer + nul_location + 1);
+ server_capabilities_v1 = xstrdup(line + nul_location + 1);
*len = nul_location;
}
-static int process_dummy_ref(void)
+static int process_dummy_ref(const char *line)
{
struct object_id oid;
const char *name;
- if (parse_oid_hex(packet_buffer, &oid, &name))
+ if (parse_oid_hex(line, &oid, &name))
return 0;
if (*name != ' ')
return 0;
return !oidcmp(&null_oid, &oid) && !strcmp(name, "capabilities^{}");
}
-static void check_no_capabilities(int len)
+static void check_no_capabilities(const char *line, int len)
{
- if (strlen(packet_buffer) != len)
+ if (strlen(line) != len)
warning("Ignoring capabilities after first line '%s'",
- packet_buffer + strlen(packet_buffer));
+ line + strlen(line));
}
-static int process_ref(int len, struct ref ***list, unsigned int flags,
- struct oid_array *extra_have)
+static int process_ref(const char *line, int len, struct ref ***list,
+ unsigned int flags, struct oid_array *extra_have)
{
struct object_id old_oid;
const char *name;
- if (parse_oid_hex(packet_buffer, &old_oid, &name))
+ if (parse_oid_hex(line, &old_oid, &name))
return 0;
if (*name != ' ')
return 0;
**list = ref;
*list = &ref->next;
}
- check_no_capabilities(len);
+ check_no_capabilities(line, len);
return 1;
}
-static int process_shallow(int len, struct oid_array *shallow_points)
+static int process_shallow(const char *line, int len,
+ struct oid_array *shallow_points)
{
const char *arg;
struct object_id old_oid;
- if (!skip_prefix(packet_buffer, "shallow ", &arg))
+ if (!skip_prefix(line, "shallow ", &arg))
return 0;
if (get_oid_hex(arg, &old_oid))
if (!shallow_points)
die("repository on the other end cannot be shallow");
oid_array_append(shallow_points, &old_oid);
- check_no_capabilities(len);
+ check_no_capabilities(line, len);
return 1;
}
+enum get_remote_heads_state {
+ EXPECTING_FIRST_REF = 0,
+ EXPECTING_REF,
+ EXPECTING_SHALLOW,
+ EXPECTING_DONE,
+};
+
/*
* Read all the refs from the other end
*/
-struct ref **get_remote_heads(int in, char *src_buf, size_t src_len,
+struct ref **get_remote_heads(struct packet_reader *reader,
struct ref **list, unsigned int flags,
struct oid_array *extra_have,
struct oid_array *shallow_points)
{
struct ref **orig_list = list;
-
- /*
- * A hang-up after seeing some response from the other end
- * means that it is unexpected, as we know the other end is
- * willing to talk to us. A hang-up before seeing any
- * response does not necessarily mean an ACL problem, though.
- */
- int responded = 0;
- int len;
- int state = EXPECTING_PROTOCOL_VERSION;
+ int len = 0;
+ enum get_remote_heads_state state = EXPECTING_FIRST_REF;
+ const char *arg;
*list = NULL;
- while ((len = read_remote_ref(in, &src_buf, &src_len, &responded))) {
+ while (state != EXPECTING_DONE) {
+ switch (packet_reader_read(reader)) {
+ case PACKET_READ_EOF:
+ die_initial_contact(1);
+ case PACKET_READ_NORMAL:
+ len = reader->pktlen;
+ if (len > 4 && skip_prefix(reader->line, "ERR ", &arg))
+ die("remote error: %s", arg);
+ break;
+ case PACKET_READ_FLUSH:
+ state = EXPECTING_DONE;
+ break;
+ case PACKET_READ_DELIM:
+ die("invalid packet");
+ }
+
switch (state) {
- case EXPECTING_PROTOCOL_VERSION:
- if (process_protocol_version()) {
- state = EXPECTING_FIRST_REF;
- break;
- }
- state = EXPECTING_FIRST_REF;
- /* fallthrough */
case EXPECTING_FIRST_REF:
- process_capabilities(&len);
- if (process_dummy_ref()) {
+ process_capabilities(reader->line, &len);
+ if (process_dummy_ref(reader->line)) {
state = EXPECTING_SHALLOW;
break;
}
state = EXPECTING_REF;
/* fallthrough */
case EXPECTING_REF:
- if (process_ref(len, &list, flags, extra_have))
+ if (process_ref(reader->line, len, &list, flags, extra_have))
break;
state = EXPECTING_SHALLOW;
/* fallthrough */
case EXPECTING_SHALLOW:
- if (process_shallow(len, shallow_points))
+ if (process_shallow(reader->line, len, shallow_points))
break;
- die("protocol error: unexpected '%s'", packet_buffer);
- default:
- die("unexpected state %d", state);
+ die("protocol error: unexpected '%s'", reader->line);
+ case EXPECTING_DONE:
+ break;
}
}
return list;
}
+/* Returns 1 when a valid ref has been added to `list`, 0 otherwise */
+static int process_ref_v2(const char *line, struct ref ***list)
+{
+ int ret = 1;
+ int i = 0;
+ struct object_id old_oid;
+ struct ref *ref;
+ struct string_list line_sections = STRING_LIST_INIT_DUP;
+ const char *end;
+
+ /*
+ * Ref lines have a number of fields which are space deliminated. The
+ * first field is the OID of the ref. The second field is the ref
+ * name. Subsequent fields (symref-target and peeled) are optional and
+ * don't have a particular order.
+ */
+ if (string_list_split(&line_sections, line, ' ', -1) < 2) {
+ ret = 0;
+ goto out;
+ }
+
+ if (parse_oid_hex(line_sections.items[i++].string, &old_oid, &end) ||
+ *end) {
+ ret = 0;
+ goto out;
+ }
+
+ ref = alloc_ref(line_sections.items[i++].string);
+
+ oidcpy(&ref->old_oid, &old_oid);
+ **list = ref;
+ *list = &ref->next;
+
+ for (; i < line_sections.nr; i++) {
+ const char *arg = line_sections.items[i].string;
+ if (skip_prefix(arg, "symref-target:", &arg))
+ ref->symref = xstrdup(arg);
+
+ if (skip_prefix(arg, "peeled:", &arg)) {
+ struct object_id peeled_oid;
+ char *peeled_name;
+ struct ref *peeled;
+ if (parse_oid_hex(arg, &peeled_oid, &end) || *end) {
+ ret = 0;
+ goto out;
+ }
+
+ peeled_name = xstrfmt("%s^{}", ref->name);
+ peeled = alloc_ref(peeled_name);
+
+ oidcpy(&peeled->old_oid, &peeled_oid);
+ **list = peeled;
+ *list = &peeled->next;
+
+ free(peeled_name);
+ }
+ }
+
+out:
+ string_list_clear(&line_sections, 0);
+ return ret;
+}
+
+struct ref **get_remote_refs(int fd_out, struct packet_reader *reader,
+ struct ref **list, int for_push,
+ const struct argv_array *ref_prefixes,
+ const struct string_list *server_options)
+{
+ int i;
+ *list = NULL;
+
+ if (server_supports_v2("ls-refs", 1))
+ packet_write_fmt(fd_out, "command=ls-refs\n");
+
+ if (server_supports_v2("agent", 0))
+ packet_write_fmt(fd_out, "agent=%s", git_user_agent_sanitized());
+
+ if (server_options && server_options->nr &&
+ server_supports_v2("server-option", 1))
+ for (i = 0; i < server_options->nr; i++)
+ packet_write_fmt(fd_out, "server-option=%s",
+ server_options->items[i].string);
+
+ packet_delim(fd_out);
+ /* When pushing we don't want to request the peeled tags */
+ if (!for_push)
+ packet_write_fmt(fd_out, "peel\n");
+ packet_write_fmt(fd_out, "symrefs\n");
+ for (i = 0; ref_prefixes && i < ref_prefixes->argc; i++) {
+ packet_write_fmt(fd_out, "ref-prefix %s\n",
+ ref_prefixes->argv[i]);
+ }
+ packet_flush(fd_out);
+
+ /* Process response from server */
+ while (packet_reader_read(reader) == PACKET_READ_NORMAL) {
+ if (!process_ref_v2(reader->line, &list))
+ die("invalid ls-refs response: %s", reader->line);
+ }
+
+ if (reader->status != PACKET_READ_FLUSH)
+ die("expected flush after ref listing");
+
+ return list;
+}
+
static const char *parse_feature_value(const char *feature_list, const char *feature, int *lenp)
{
int len;
const char *server_feature_value(const char *feature, int *len)
{
- return parse_feature_value(server_capabilities, feature, len);
+ return parse_feature_value(server_capabilities_v1, feature, len);
}
int server_supports(const char *feature)
}
enum ssh_variant {
+ VARIANT_AUTO,
VARIANT_SIMPLE,
VARIANT_SSH,
VARIANT_PLINK,
VARIANT_TORTOISEPLINK,
};
-static int override_ssh_variant(enum ssh_variant *ssh_variant)
+static void override_ssh_variant(enum ssh_variant *ssh_variant)
{
const char *variant = getenv("GIT_SSH_VARIANT");
if (!variant && git_config_get_string_const("ssh.variant", &variant))
- return 0;
+ return;
- if (!strcmp(variant, "plink"))
+ if (!strcmp(variant, "auto"))
+ *ssh_variant = VARIANT_AUTO;
+ else if (!strcmp(variant, "plink"))
*ssh_variant = VARIANT_PLINK;
else if (!strcmp(variant, "putty"))
*ssh_variant = VARIANT_PUTTY;
*ssh_variant = VARIANT_SIMPLE;
else
*ssh_variant = VARIANT_SSH;
-
- return 1;
}
static enum ssh_variant determine_ssh_variant(const char *ssh_command,
int is_cmdline)
{
- enum ssh_variant ssh_variant = VARIANT_SIMPLE;
+ enum ssh_variant ssh_variant = VARIANT_AUTO;
const char *variant;
char *p = NULL;
- if (override_ssh_variant(&ssh_variant))
+ override_ssh_variant(&ssh_variant);
+
+ if (ssh_variant != VARIANT_AUTO)
return ssh_variant;
if (!is_cmdline) {
*/
static struct child_process *git_connect_git(int fd[2], char *hostandport,
const char *path, const char *prog,
+ enum protocol_version version,
int flags)
{
struct child_process *conn;
transport_check_allowed("git");
- /* These underlying connection commands die() if they
+ /*
+ * These underlying connection commands die() if they
* cannot connect.
*/
if (git_use_proxy(hostandport))
target_host, 0);
/* If using a new version put that stuff here after a second null byte */
- if (get_protocol_version_config() > 0) {
+ if (version > 0) {
strbuf_addch(&request, '\0');
strbuf_addf(&request, "version=%d%c",
- get_protocol_version_config(), '\0');
+ version, '\0');
}
packet_write(fd[1], request.buf, request.len);
return conn;
}
+/*
+ * Append the appropriate environment variables to `env` and options to
+ * `args` for running ssh in Git's SSH-tunneled transport.
+ */
+static void push_ssh_options(struct argv_array *args, struct argv_array *env,
+ enum ssh_variant variant, const char *port,
+ enum protocol_version version, int flags)
+{
+ if (variant == VARIANT_SSH &&
+ version > 0) {
+ argv_array_push(args, "-o");
+ argv_array_push(args, "SendEnv=" GIT_PROTOCOL_ENVIRONMENT);
+ argv_array_pushf(env, GIT_PROTOCOL_ENVIRONMENT "=version=%d",
+ version);
+ }
+
+ if (flags & CONNECT_IPV4) {
+ switch (variant) {
+ case VARIANT_AUTO:
+ BUG("VARIANT_AUTO passed to push_ssh_options");
+ case VARIANT_SIMPLE:
+ die("ssh variant 'simple' does not support -4");
+ case VARIANT_SSH:
+ case VARIANT_PLINK:
+ case VARIANT_PUTTY:
+ case VARIANT_TORTOISEPLINK:
+ argv_array_push(args, "-4");
+ }
+ } else if (flags & CONNECT_IPV6) {
+ switch (variant) {
+ case VARIANT_AUTO:
+ BUG("VARIANT_AUTO passed to push_ssh_options");
+ case VARIANT_SIMPLE:
+ die("ssh variant 'simple' does not support -6");
+ case VARIANT_SSH:
+ case VARIANT_PLINK:
+ case VARIANT_PUTTY:
+ case VARIANT_TORTOISEPLINK:
+ argv_array_push(args, "-6");
+ }
+ }
+
+ if (variant == VARIANT_TORTOISEPLINK)
+ argv_array_push(args, "-batch");
+
+ if (port) {
+ switch (variant) {
+ case VARIANT_AUTO:
+ BUG("VARIANT_AUTO passed to push_ssh_options");
+ case VARIANT_SIMPLE:
+ die("ssh variant 'simple' does not support setting port");
+ case VARIANT_SSH:
+ argv_array_push(args, "-p");
+ break;
+ case VARIANT_PLINK:
+ case VARIANT_PUTTY:
+ case VARIANT_TORTOISEPLINK:
+ argv_array_push(args, "-P");
+ }
+
+ argv_array_push(args, port);
+ }
+}
+
+/* Prepare a child_process for use by Git's SSH-tunneled transport. */
+static void fill_ssh_args(struct child_process *conn, const char *ssh_host,
+ const char *port, enum protocol_version version,
+ int flags)
+{
+ const char *ssh;
+ enum ssh_variant variant;
+
+ if (looks_like_command_line_option(ssh_host))
+ die("strange hostname '%s' blocked", ssh_host);
+
+ ssh = get_ssh_command();
+ if (ssh) {
+ variant = determine_ssh_variant(ssh, 1);
+ } else {
+ /*
+ * GIT_SSH is the no-shell version of
+ * GIT_SSH_COMMAND (and must remain so for
+ * historical compatibility).
+ */
+ conn->use_shell = 0;
+
+ ssh = getenv("GIT_SSH");
+ if (!ssh)
+ ssh = "ssh";
+ variant = determine_ssh_variant(ssh, 0);
+ }
+
+ if (variant == VARIANT_AUTO) {
+ struct child_process detect = CHILD_PROCESS_INIT;
+
+ detect.use_shell = conn->use_shell;
+ detect.no_stdin = detect.no_stdout = detect.no_stderr = 1;
+
+ argv_array_push(&detect.args, ssh);
+ argv_array_push(&detect.args, "-G");
+ push_ssh_options(&detect.args, &detect.env_array,
+ VARIANT_SSH, port, version, flags);
+ argv_array_push(&detect.args, ssh_host);
+
+ variant = run_command(&detect) ? VARIANT_SIMPLE : VARIANT_SSH;
+ }
+
+ argv_array_push(&conn->args, ssh);
+ push_ssh_options(&conn->args, &conn->env_array, variant, port, version, flags);
+ argv_array_push(&conn->args, ssh_host);
+}
+
/*
* This returns the dummy child_process `no_fork` if the transport protocol
* does not need fork(2), or a struct child_process object if it does. Once
char *hostandport, *path;
struct child_process *conn;
enum protocol protocol;
+ enum protocol_version version = get_protocol_version_config();
+
+ /*
+ * 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", prog))
+ version = protocol_v0;
/* Without this we cannot rely on waitpid() to tell
* what happened to our children.
printf("Diag: path=%s\n", path ? path : "NULL");
conn = NULL;
} else if (protocol == PROTO_GIT) {
- conn = git_connect_git(fd, hostandport, path, prog, flags);
+ conn = git_connect_git(fd, hostandport, path, prog, version, flags);
} else {
struct strbuf cmd = STRBUF_INIT;
const char *const *var;
conn->use_shell = 1;
conn->in = conn->out = -1;
if (protocol == PROTO_SSH) {
- const char *ssh;
- enum ssh_variant variant;
char *ssh_host = hostandport;
const char *port = NULL;
transport_check_allowed("ssh");
strbuf_release(&cmd);
return NULL;
}
-
- if (looks_like_command_line_option(ssh_host))
- die("strange hostname '%s' blocked", ssh_host);
-
- ssh = get_ssh_command();
- if (ssh) {
- variant = determine_ssh_variant(ssh, 1);
- } else {
- /*
- * GIT_SSH is the no-shell version of
- * GIT_SSH_COMMAND (and must remain so for
- * historical compatibility).
- */
- conn->use_shell = 0;
-
- ssh = getenv("GIT_SSH");
- if (!ssh)
- ssh = "ssh";
- variant = determine_ssh_variant(ssh, 0);
- }
-
- argv_array_push(&conn->args, ssh);
-
- if (variant == VARIANT_SSH &&
- get_protocol_version_config() > 0) {
- argv_array_push(&conn->args, "-o");
- argv_array_push(&conn->args, "SendEnv=" GIT_PROTOCOL_ENVIRONMENT);
- argv_array_pushf(&conn->env_array, GIT_PROTOCOL_ENVIRONMENT "=version=%d",
- get_protocol_version_config());
- }
-
- if (variant != VARIANT_SIMPLE) {
- if (flags & CONNECT_IPV4)
- argv_array_push(&conn->args, "-4");
- else if (flags & CONNECT_IPV6)
- argv_array_push(&conn->args, "-6");
- }
-
- if (variant == VARIANT_TORTOISEPLINK)
- argv_array_push(&conn->args, "-batch");
-
- if (port && variant != VARIANT_SIMPLE) {
- if (variant == VARIANT_SSH)
- argv_array_push(&conn->args, "-p");
- else
- argv_array_push(&conn->args, "-P");
-
- argv_array_push(&conn->args, port);
- }
-
- argv_array_push(&conn->args, ssh_host);
+ fill_ssh_args(conn, ssh_host, port, version, flags);
} else {
transport_check_allowed("file");
- if (get_protocol_version_config() > 0) {
+ if (version > 0) {
argv_array_pushf(&conn->env_array, GIT_PROTOCOL_ENVIRONMENT "=version=%d",
- get_protocol_version_config());
+ version);
}
}
argv_array_push(&conn->args, cmd.buf);