#include "string-list.h"
#include "sha1-array.h"
#include "transport.h"
+#include "strbuf.h"
+#include "protocol.h"
static char *server_capabilities;
static const char *parse_feature_value(const char *, const char *, int *);
}
/*
+ * 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)
+{
+ 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);
+ if (nul_location == *len)
+ return;
+ server_capabilities = xstrdup(packet_buffer + nul_location + 1);
+ *len = nul_location;
+}
+
+static int process_dummy_ref(void)
+{
+ struct object_id oid;
+ const char *name;
+
+ if (parse_oid_hex(packet_buffer, &oid, &name))
+ return 0;
+ if (*name != ' ')
+ return 0;
+ name++;
+
+ return !oidcmp(&null_oid, &oid) && !strcmp(name, "capabilities^{}");
+}
+
+static void check_no_capabilities(int len)
+{
+ if (strlen(packet_buffer) != len)
+ warning("Ignoring capabilities after first line '%s'",
+ packet_buffer + strlen(packet_buffer));
+}
+
+static int process_ref(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))
+ return 0;
+ if (*name != ' ')
+ return 0;
+ name++;
+
+ if (extra_have && !strcmp(name, ".have")) {
+ oid_array_append(extra_have, &old_oid);
+ } else if (!strcmp(name, "capabilities^{}")) {
+ die("protocol error: unexpected capabilities^{}");
+ } else if (check_ref(name, flags)) {
+ struct ref *ref = alloc_ref(name);
+ oidcpy(&ref->old_oid, &old_oid);
+ **list = ref;
+ *list = &ref->next;
+ }
+ check_no_capabilities(len);
+ return 1;
+}
+
+static int process_shallow(int len, struct oid_array *shallow_points)
+{
+ const char *arg;
+ struct object_id old_oid;
+
+ if (!skip_prefix(packet_buffer, "shallow ", &arg))
+ return 0;
+
+ if (get_oid_hex(arg, &old_oid))
+ die("protocol error: expected shallow sha-1, got '%s'", arg);
+ if (!shallow_points)
+ die("repository on the other end cannot be shallow");
+ oid_array_append(shallow_points, &old_oid);
+ check_no_capabilities(len);
+ return 1;
+}
+
+/*
* Read all the refs from the other end
*/
struct ref **get_remote_heads(int in, char *src_buf, size_t src_len,
* willing to talk to us. A hang-up before seeing any
* response does not necessarily mean an ACL problem, though.
*/
- int saw_response;
- int got_dummy_ref_with_capabilities_declaration = 0;
+ int responded = 0;
+ int len;
+ int state = EXPECTING_PROTOCOL_VERSION;
*list = NULL;
- for (saw_response = 0; ; saw_response = 1) {
- struct ref *ref;
- struct object_id old_oid;
- char *name;
- int len, name_len;
- char *buffer = packet_buffer;
- const char *arg;
-
- len = packet_read(in, &src_buf, &src_len,
- packet_buffer, sizeof(packet_buffer),
- PACKET_READ_GENTLE_ON_EOF |
- PACKET_READ_CHOMP_NEWLINE);
- if (len < 0)
- die_initial_contact(saw_response);
-
- if (!len)
- break;
-
- if (len > 4 && skip_prefix(buffer, "ERR ", &arg))
- die("remote error: %s", arg);
-
- if (len == GIT_SHA1_HEXSZ + strlen("shallow ") &&
- skip_prefix(buffer, "shallow ", &arg)) {
- if (get_oid_hex(arg, &old_oid))
- die("protocol error: expected shallow sha-1, got '%s'", arg);
- if (!shallow_points)
- die("repository on the other end cannot be shallow");
- oid_array_append(shallow_points, &old_oid);
- continue;
- }
-
- if (len < GIT_SHA1_HEXSZ + 2 || get_oid_hex(buffer, &old_oid) ||
- buffer[GIT_SHA1_HEXSZ] != ' ')
- die("protocol error: expected sha/ref, got '%s'", buffer);
- name = buffer + GIT_SHA1_HEXSZ + 1;
-
- name_len = strlen(name);
- if (len != name_len + GIT_SHA1_HEXSZ + 1) {
- free(server_capabilities);
- server_capabilities = xstrdup(name + name_len + 1);
- }
- if (extra_have && !strcmp(name, ".have")) {
- oid_array_append(extra_have, &old_oid);
- continue;
- }
-
- if (!strcmp(name, "capabilities^{}")) {
- if (saw_response)
- die("protocol error: unexpected capabilities^{}");
- if (got_dummy_ref_with_capabilities_declaration)
- die("protocol error: multiple capabilities^{}");
- got_dummy_ref_with_capabilities_declaration = 1;
- continue;
+ while ((len = read_remote_ref(in, &src_buf, &src_len, &responded))) {
+ 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()) {
+ state = EXPECTING_SHALLOW;
+ break;
+ }
+ state = EXPECTING_REF;
+ /* fallthrough */
+ case EXPECTING_REF:
+ if (process_ref(len, &list, flags, extra_have))
+ break;
+ state = EXPECTING_SHALLOW;
+ /* fallthrough */
+ case EXPECTING_SHALLOW:
+ if (process_shallow(len, shallow_points))
+ break;
+ die("protocol error: unexpected '%s'", packet_buffer);
+ default:
+ die("unexpected state %d", state);
}
-
- if (!check_ref(name, flags))
- continue;
-
- if (got_dummy_ref_with_capabilities_declaration)
- die("protocol error: unexpected ref after capabilities^{}");
-
- ref = alloc_ref(buffer + GIT_SHA1_HEXSZ + 1);
- oidcpy(&ref->old_oid, &old_oid);
- *list = ref;
- list = &ref->next;
}
annotate_refs_with_symref_info(*orig_list);
#endif /* NO_IPV6 */
-static void git_tcp_connect(int fd[2], char *host, int flags)
+/*
+ * Dummy child_process returned by git_connect() if the transport protocol
+ * does not need fork(2).
+ */
+static struct child_process no_fork = CHILD_PROCESS_INIT;
+
+int git_connection_is_socket(struct child_process *conn)
+{
+ return conn == &no_fork;
+}
+
+static struct child_process *git_tcp_connect(int fd[2], char *host, int flags)
{
int sockfd = git_tcp_connect_sock(host, flags);
fd[0] = sockfd;
fd[1] = dup(sockfd);
+
+ return &no_fork;
}
return protocol;
}
-static struct child_process no_fork = CHILD_PROCESS_INIT;
-
static const char *get_ssh_command(void)
{
const char *ssh;
return NULL;
}
-static int override_ssh_variant(int *port_option, int *needs_batch)
+enum ssh_variant {
+ VARIANT_AUTO,
+ VARIANT_SIMPLE,
+ VARIANT_SSH,
+ VARIANT_PLINK,
+ VARIANT_PUTTY,
+ VARIANT_TORTOISEPLINK,
+};
+
+static void override_ssh_variant(enum ssh_variant *ssh_variant)
{
- char *variant;
+ const char *variant = getenv("GIT_SSH_VARIANT");
- variant = xstrdup_or_null(getenv("GIT_SSH_VARIANT"));
- if (!variant &&
- git_config_get_string("ssh.variant", &variant))
- return 0;
+ if (!variant && git_config_get_string_const("ssh.variant", &variant))
+ return;
- if (!strcmp(variant, "plink") || !strcmp(variant, "putty")) {
- *port_option = 'P';
- *needs_batch = 0;
- } else if (!strcmp(variant, "tortoiseplink")) {
- *port_option = 'P';
- *needs_batch = 1;
- } else {
- *port_option = 'p';
- *needs_batch = 0;
- }
- free(variant);
- return 1;
+ 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;
+ else if (!strcmp(variant, "tortoiseplink"))
+ *ssh_variant = VARIANT_TORTOISEPLINK;
+ else if (!strcmp(variant, "simple"))
+ *ssh_variant = VARIANT_SIMPLE;
+ else
+ *ssh_variant = VARIANT_SSH;
}
-static void handle_ssh_variant(const char *ssh_command, int is_cmdline,
- int *port_option, int *needs_batch)
+static enum ssh_variant determine_ssh_variant(const char *ssh_command,
+ int is_cmdline)
{
+ enum ssh_variant ssh_variant = VARIANT_AUTO;
const char *variant;
char *p = NULL;
- if (override_ssh_variant(port_option, needs_batch))
- return;
+ override_ssh_variant(&ssh_variant);
+
+ if (ssh_variant != VARIANT_AUTO)
+ return ssh_variant;
if (!is_cmdline) {
p = xstrdup(ssh_command);
free(ssh_argv);
} else {
free(p);
- return;
+ return ssh_variant;
}
}
- if (!strcasecmp(variant, "plink") ||
- !strcasecmp(variant, "plink.exe"))
- *port_option = 'P';
+ if (!strcasecmp(variant, "ssh") ||
+ !strcasecmp(variant, "ssh.exe"))
+ ssh_variant = VARIANT_SSH;
+ else if (!strcasecmp(variant, "plink") ||
+ !strcasecmp(variant, "plink.exe"))
+ ssh_variant = VARIANT_PLINK;
else if (!strcasecmp(variant, "tortoiseplink") ||
- !strcasecmp(variant, "tortoiseplink.exe")) {
- *port_option = 'P';
- *needs_batch = 1;
- }
+ !strcasecmp(variant, "tortoiseplink.exe"))
+ ssh_variant = VARIANT_TORTOISEPLINK;
+
free(p);
+ return ssh_variant;
+}
+
+/*
+ * Open a connection using Git's native protocol.
+ *
+ * The caller is responsible for freeing hostandport, but this function may
+ * modify it (for example, to truncate it to remove the port part).
+ */
+static struct child_process *git_connect_git(int fd[2], char *hostandport,
+ const char *path, const char *prog,
+ int flags)
+{
+ struct child_process *conn;
+ struct strbuf request = STRBUF_INIT;
+ /*
+ * Set up virtual host information based on where we will
+ * connect, unless the user has overridden us in
+ * the environment.
+ */
+ char *target_host = getenv("GIT_OVERRIDE_VIRTUAL_HOST");
+ if (target_host)
+ target_host = xstrdup(target_host);
+ else
+ target_host = xstrdup(hostandport);
+
+ transport_check_allowed("git");
+
+ /*
+ * These underlying connection commands die() if they
+ * cannot connect.
+ */
+ if (git_use_proxy(hostandport))
+ conn = git_proxy_connect(fd, hostandport);
+ else
+ conn = git_tcp_connect(fd, hostandport, flags);
+ /*
+ * Separate original protocol components prog and path
+ * from extended host header with a NUL byte.
+ *
+ * Note: Do not add any other headers here! Doing so
+ * will cause older git-daemon servers to crash.
+ */
+ strbuf_addf(&request,
+ "%s %s%chost=%s%c",
+ prog, path, 0,
+ target_host, 0);
+
+ /* If using a new version put that stuff here after a second null byte */
+ if (get_protocol_version_config() > 0) {
+ strbuf_addch(&request, '\0');
+ strbuf_addf(&request, "version=%d%c",
+ get_protocol_version_config(), '\0');
+ }
+
+ packet_write(fd[1], request.buf, request.len);
+
+ free(target_host);
+ strbuf_release(&request);
+ 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,
+ int flags)
+{
+ if (variant == VARIANT_SSH &&
+ get_protocol_version_config() > 0) {
+ argv_array_push(args, "-o");
+ argv_array_push(args, "SendEnv=" GIT_PROTOCOL_ENVIRONMENT);
+ argv_array_pushf(env, GIT_PROTOCOL_ENVIRONMENT "=version=%d",
+ get_protocol_version_config());
+ }
+
+ 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, 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, 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, flags);
+ argv_array_push(&conn->args, ssh_host);
}
/*
- * This returns a dummy child_process if the transport protocol does not
- * need fork(2), or a struct child_process object if it does. Once done,
- * finish the connection with finish_connect() with the value returned from
- * this function (it is safe to call finish_connect() with NULL to support
- * the former case).
+ * 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
+ * done, finish the connection with finish_connect() with the value returned
+ * from this function (it is safe to call finish_connect() with NULL to
+ * support the former case).
*
* If it returns, the connect is successful; it just dies on errors (this
* will hopefully be changed in a libification effort, to return NULL when
const char *prog, int flags)
{
char *hostandport, *path;
- struct child_process *conn = &no_fork;
+ struct child_process *conn;
enum protocol protocol;
/* Without this we cannot rely on waitpid() to tell
printf("Diag: path=%s\n", path ? path : "NULL");
conn = NULL;
} else if (protocol == PROTO_GIT) {
- /*
- * Set up virtual host information based on where we will
- * connect, unless the user has overridden us in
- * the environment.
- */
- char *target_host = getenv("GIT_OVERRIDE_VIRTUAL_HOST");
- if (target_host)
- target_host = xstrdup(target_host);
- else
- target_host = xstrdup(hostandport);
-
- transport_check_allowed("git");
-
- /* These underlying connection commands die() if they
- * cannot connect.
- */
- if (git_use_proxy(hostandport))
- conn = git_proxy_connect(fd, hostandport);
- else
- git_tcp_connect(fd, hostandport, flags);
- /*
- * Separate original protocol components prog and path
- * from extended host header with a NUL byte.
- *
- * Note: Do not add any other headers here! Doing so
- * will cause older git-daemon servers to crash.
- */
- packet_write_fmt(fd[1],
- "%s %s%chost=%s%c",
- prog, path, 0,
- target_host, 0);
- free(target_host);
+ conn = git_connect_git(fd, hostandport, path, prog, flags);
} else {
struct strbuf cmd = STRBUF_INIT;
+ const char *const *var;
conn = xmalloc(sizeof(*conn));
child_process_init(conn);
sq_quote_buf(&cmd, path);
/* remove repo-local variables from the environment */
- conn->env = local_repo_env;
+ for (var = local_repo_env; *var; var++)
+ argv_array_push(&conn->env_array, *var);
+
conn->use_shell = 1;
conn->in = conn->out = -1;
if (protocol == PROTO_SSH) {
- const char *ssh;
- int needs_batch = 0;
- int port_option = 'p';
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)
- handle_ssh_variant(ssh, 1, &port_option,
- &needs_batch);
- 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";
- else
- handle_ssh_variant(ssh, 0,
- &port_option,
- &needs_batch);
- }
-
- argv_array_push(&conn->args, ssh);
- if (flags & CONNECT_IPV4)
- argv_array_push(&conn->args, "-4");
- else if (flags & CONNECT_IPV6)
- argv_array_push(&conn->args, "-6");
- if (needs_batch)
- argv_array_push(&conn->args, "-batch");
- if (port) {
- argv_array_pushf(&conn->args,
- "-%c", port_option);
- argv_array_push(&conn->args, port);
- }
- argv_array_push(&conn->args, ssh_host);
+ fill_ssh_args(conn, ssh_host, port, flags);
} else {
transport_check_allowed("file");
+ if (get_protocol_version_config() > 0) {
+ argv_array_pushf(&conn->env_array, GIT_PROTOCOL_ENVIRONMENT "=version=%d",
+ get_protocol_version_config());
+ }
}
argv_array_push(&conn->args, cmd.buf);
return conn;
}
-int git_connection_is_socket(struct child_process *conn)
-{
- return conn == &no_fork;
-}
-
int finish_connect(struct child_process *conn)
{
int code;
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