git/connect.c
Johannes Schindelin 9ac92fed5b Sync with 2.15.4
* maint-2.15: (29 commits)
  Git 2.15.4
  Git 2.14.6
  mingw: handle `subst`-ed "DOS drives"
  mingw: refuse to access paths with trailing spaces or periods
  mingw: refuse to access paths with illegal characters
  unpack-trees: let merged_entry() pass through do_add_entry()'s errors
  quote-stress-test: offer to test quoting arguments for MSYS2 sh
  t6130/t9350: prepare for stringent Win32 path validation
  quote-stress-test: allow skipping some trials
  quote-stress-test: accept arguments to test via the command-line
  tests: add a helper to stress test argument quoting
  mingw: fix quoting of arguments
  Disallow dubiously-nested submodule git directories
  protect_ntfs: turn on NTFS protection by default
  path: also guard `.gitmodules` against NTFS Alternate Data Streams
  is_ntfs_dotgit(): speed it up
  mingw: disallow backslash characters in tree objects' file names
  path: safeguard `.git` against NTFS Alternate Streams Accesses
  clone --recurse-submodules: prevent name squatting on Windows
  is_ntfs_dotgit(): only verify the leading segment
  ...
2019-12-06 16:27:18 +01:00

1143 lines
27 KiB
C

#include "git-compat-util.h"
#include "cache.h"
#include "config.h"
#include "pkt-line.h"
#include "quote.h"
#include "refs.h"
#include "run-command.h"
#include "remote.h"
#include "connect.h"
#include "url.h"
#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 *);
static int check_ref(const char *name, unsigned int flags)
{
if (!flags)
return 1;
if (!skip_prefix(name, "refs/", &name))
return 0;
/* REF_NORMAL means that we don't want the magic fake tag refs */
if ((flags & REF_NORMAL) && check_refname_format(name, 0))
return 0;
/* REF_HEADS means that we want regular branch heads */
if ((flags & REF_HEADS) && starts_with(name, "heads/"))
return 1;
/* REF_TAGS means that we want tags */
if ((flags & REF_TAGS) && starts_with(name, "tags/"))
return 1;
/* All type bits clear means that we are ok with anything */
return !(flags & ~REF_NORMAL);
}
int check_ref_type(const struct ref *ref, int flags)
{
return check_ref(ref->name, flags);
}
static void die_initial_contact(int unexpected)
{
if (unexpected)
die(_("The remote end hung up upon initial contact"));
else
die(_("Could not read from remote repository.\n\n"
"Please make sure you have the correct access rights\n"
"and the repository exists."));
}
static void parse_one_symref_info(struct string_list *symref, const char *val, int len)
{
char *sym, *target;
struct string_list_item *item;
if (!len)
return; /* just "symref" */
/* e.g. "symref=HEAD:refs/heads/master" */
sym = xmemdupz(val, len);
target = strchr(sym, ':');
if (!target)
/* just "symref=something" */
goto reject;
*(target++) = '\0';
if (check_refname_format(sym, REFNAME_ALLOW_ONELEVEL) ||
check_refname_format(target, REFNAME_ALLOW_ONELEVEL))
/* "symref=bogus:pair */
goto reject;
item = string_list_append_nodup(symref, sym);
item->util = target;
return;
reject:
free(sym);
return;
}
static void annotate_refs_with_symref_info(struct ref *ref)
{
struct string_list symref = STRING_LIST_INIT_DUP;
const char *feature_list = server_capabilities;
while (feature_list) {
int len;
const char *val;
val = parse_feature_value(feature_list, "symref", &len);
if (!val)
break;
parse_one_symref_info(&symref, val, len);
feature_list = val + 1;
}
string_list_sort(&symref);
for (; ref; ref = ref->next) {
struct string_list_item *item;
item = string_list_lookup(&symref, ref->name);
if (!item)
continue;
ref->symref = xstrdup((char *)item->util);
}
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)
{
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,
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;
*list = NULL;
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);
}
}
annotate_refs_with_symref_info(*orig_list);
return list;
}
static const char *parse_feature_value(const char *feature_list, const char *feature, int *lenp)
{
int len;
if (!feature_list)
return NULL;
len = strlen(feature);
while (*feature_list) {
const char *found = strstr(feature_list, feature);
if (!found)
return NULL;
if (feature_list == found || isspace(found[-1])) {
const char *value = found + len;
/* feature with no value (e.g., "thin-pack") */
if (!*value || isspace(*value)) {
if (lenp)
*lenp = 0;
return value;
}
/* feature with a value (e.g., "agent=git/1.2.3") */
else if (*value == '=') {
value++;
if (lenp)
*lenp = strcspn(value, " \t\n");
return value;
}
/*
* otherwise we matched a substring of another feature;
* keep looking
*/
}
feature_list = found + 1;
}
return NULL;
}
int parse_feature_request(const char *feature_list, const char *feature)
{
return !!parse_feature_value(feature_list, feature, NULL);
}
const char *server_feature_value(const char *feature, int *len)
{
return parse_feature_value(server_capabilities, feature, len);
}
int server_supports(const char *feature)
{
return !!server_feature_value(feature, NULL);
}
enum protocol {
PROTO_LOCAL = 1,
PROTO_FILE,
PROTO_SSH,
PROTO_GIT
};
int url_is_local_not_ssh(const char *url)
{
const char *colon = strchr(url, ':');
const char *slash = strchr(url, '/');
return !colon || (slash && slash < colon) ||
(has_dos_drive_prefix(url) && is_valid_path(url));
}
static const char *prot_name(enum protocol protocol)
{
switch (protocol) {
case PROTO_LOCAL:
case PROTO_FILE:
return "file";
case PROTO_SSH:
return "ssh";
case PROTO_GIT:
return "git";
default:
return "unknown protocol";
}
}
static enum protocol get_protocol(const char *name)
{
if (!strcmp(name, "ssh"))
return PROTO_SSH;
if (!strcmp(name, "git"))
return PROTO_GIT;
if (!strcmp(name, "git+ssh")) /* deprecated - do not use */
return PROTO_SSH;
if (!strcmp(name, "ssh+git")) /* deprecated - do not use */
return PROTO_SSH;
if (!strcmp(name, "file"))
return PROTO_FILE;
die("I don't handle protocol '%s'", name);
}
static char *host_end(char **hoststart, int removebrackets)
{
char *host = *hoststart;
char *end;
char *start = strstr(host, "@[");
if (start)
start++; /* Jump over '@' */
else
start = host;
if (start[0] == '[') {
end = strchr(start + 1, ']');
if (end) {
if (removebrackets) {
*end = 0;
memmove(start, start + 1, end - start);
end++;
}
} else
end = host;
} else
end = host;
return end;
}
#define STR_(s) # s
#define STR(s) STR_(s)
static void get_host_and_port(char **host, const char **port)
{
char *colon, *end;
end = host_end(host, 1);
colon = strchr(end, ':');
if (colon) {
long portnr = strtol(colon + 1, &end, 10);
if (end != colon + 1 && *end == '\0' && 0 <= portnr && portnr < 65536) {
*colon = 0;
*port = colon + 1;
} else if (!colon[1]) {
*colon = 0;
}
}
}
static void enable_keepalive(int sockfd)
{
int ka = 1;
if (setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &ka, sizeof(ka)) < 0)
fprintf(stderr, "unable to set SO_KEEPALIVE on socket: %s\n",
strerror(errno));
}
#ifndef NO_IPV6
static const char *ai_name(const struct addrinfo *ai)
{
static char addr[NI_MAXHOST];
if (getnameinfo(ai->ai_addr, ai->ai_addrlen, addr, sizeof(addr), NULL, 0,
NI_NUMERICHOST) != 0)
xsnprintf(addr, sizeof(addr), "(unknown)");
return addr;
}
/*
* Returns a connected socket() fd, or else die()s.
*/
static int git_tcp_connect_sock(char *host, int flags)
{
struct strbuf error_message = STRBUF_INIT;
int sockfd = -1;
const char *port = STR(DEFAULT_GIT_PORT);
struct addrinfo hints, *ai0, *ai;
int gai;
int cnt = 0;
get_host_and_port(&host, &port);
if (!*port)
port = "<none>";
memset(&hints, 0, sizeof(hints));
if (flags & CONNECT_IPV4)
hints.ai_family = AF_INET;
else if (flags & CONNECT_IPV6)
hints.ai_family = AF_INET6;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
if (flags & CONNECT_VERBOSE)
fprintf(stderr, "Looking up %s ... ", host);
gai = getaddrinfo(host, port, &hints, &ai);
if (gai)
die("Unable to look up %s (port %s) (%s)", host, port, gai_strerror(gai));
if (flags & CONNECT_VERBOSE)
fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
for (ai0 = ai; ai; ai = ai->ai_next, cnt++) {
sockfd = socket(ai->ai_family,
ai->ai_socktype, ai->ai_protocol);
if ((sockfd < 0) ||
(connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0)) {
strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
host, cnt, ai_name(ai), strerror(errno));
if (0 <= sockfd)
close(sockfd);
sockfd = -1;
continue;
}
if (flags & CONNECT_VERBOSE)
fprintf(stderr, "%s ", ai_name(ai));
break;
}
freeaddrinfo(ai0);
if (sockfd < 0)
die("unable to connect to %s:\n%s", host, error_message.buf);
enable_keepalive(sockfd);
if (flags & CONNECT_VERBOSE)
fprintf(stderr, "done.\n");
strbuf_release(&error_message);
return sockfd;
}
#else /* NO_IPV6 */
/*
* Returns a connected socket() fd, or else die()s.
*/
static int git_tcp_connect_sock(char *host, int flags)
{
struct strbuf error_message = STRBUF_INIT;
int sockfd = -1;
const char *port = STR(DEFAULT_GIT_PORT);
char *ep;
struct hostent *he;
struct sockaddr_in sa;
char **ap;
unsigned int nport;
int cnt;
get_host_and_port(&host, &port);
if (flags & CONNECT_VERBOSE)
fprintf(stderr, "Looking up %s ... ", host);
he = gethostbyname(host);
if (!he)
die("Unable to look up %s (%s)", host, hstrerror(h_errno));
nport = strtoul(port, &ep, 10);
if ( ep == port || *ep ) {
/* Not numeric */
struct servent *se = getservbyname(port,"tcp");
if ( !se )
die("Unknown port %s", port);
nport = se->s_port;
}
if (flags & CONNECT_VERBOSE)
fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
for (cnt = 0, ap = he->h_addr_list; *ap; ap++, cnt++) {
memset(&sa, 0, sizeof sa);
sa.sin_family = he->h_addrtype;
sa.sin_port = htons(nport);
memcpy(&sa.sin_addr, *ap, he->h_length);
sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
if ((sockfd < 0) ||
connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
strbuf_addf(&error_message, "%s[%d: %s]: errno=%s\n",
host,
cnt,
inet_ntoa(*(struct in_addr *)&sa.sin_addr),
strerror(errno));
if (0 <= sockfd)
close(sockfd);
sockfd = -1;
continue;
}
if (flags & CONNECT_VERBOSE)
fprintf(stderr, "%s ",
inet_ntoa(*(struct in_addr *)&sa.sin_addr));
break;
}
if (sockfd < 0)
die("unable to connect to %s:\n%s", host, error_message.buf);
enable_keepalive(sockfd);
if (flags & CONNECT_VERBOSE)
fprintf(stderr, "done.\n");
return sockfd;
}
#endif /* NO_IPV6 */
/*
* 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;
}
static char *git_proxy_command;
static int git_proxy_command_options(const char *var, const char *value,
void *cb)
{
if (!strcmp(var, "core.gitproxy")) {
const char *for_pos;
int matchlen = -1;
int hostlen;
const char *rhost_name = cb;
int rhost_len = strlen(rhost_name);
if (git_proxy_command)
return 0;
if (!value)
return config_error_nonbool(var);
/* [core]
* ;# matches www.kernel.org as well
* gitproxy = netcatter-1 for kernel.org
* gitproxy = netcatter-2 for sample.xz
* gitproxy = netcatter-default
*/
for_pos = strstr(value, " for ");
if (!for_pos)
/* matches everybody */
matchlen = strlen(value);
else {
hostlen = strlen(for_pos + 5);
if (rhost_len < hostlen)
matchlen = -1;
else if (!strncmp(for_pos + 5,
rhost_name + rhost_len - hostlen,
hostlen) &&
((rhost_len == hostlen) ||
rhost_name[rhost_len - hostlen -1] == '.'))
matchlen = for_pos - value;
else
matchlen = -1;
}
if (0 <= matchlen) {
/* core.gitproxy = none for kernel.org */
if (matchlen == 4 &&
!memcmp(value, "none", 4))
matchlen = 0;
git_proxy_command = xmemdupz(value, matchlen);
}
return 0;
}
return git_default_config(var, value, cb);
}
static int git_use_proxy(const char *host)
{
git_proxy_command = getenv("GIT_PROXY_COMMAND");
git_config(git_proxy_command_options, (void*)host);
return (git_proxy_command && *git_proxy_command);
}
static struct child_process *git_proxy_connect(int fd[2], char *host)
{
const char *port = STR(DEFAULT_GIT_PORT);
struct child_process *proxy;
get_host_and_port(&host, &port);
if (looks_like_command_line_option(host))
die("strange hostname '%s' blocked", host);
if (looks_like_command_line_option(port))
die("strange port '%s' blocked", port);
proxy = xmalloc(sizeof(*proxy));
child_process_init(proxy);
argv_array_push(&proxy->args, git_proxy_command);
argv_array_push(&proxy->args, host);
argv_array_push(&proxy->args, port);
proxy->in = -1;
proxy->out = -1;
if (start_command(proxy))
die("cannot start proxy %s", git_proxy_command);
fd[0] = proxy->out; /* read from proxy stdout */
fd[1] = proxy->in; /* write to proxy stdin */
return proxy;
}
static char *get_port(char *host)
{
char *end;
char *p = strchr(host, ':');
if (p) {
long port = strtol(p + 1, &end, 10);
if (end != p + 1 && *end == '\0' && 0 <= port && port < 65536) {
*p = '\0';
return p+1;
}
}
return NULL;
}
/*
* Extract protocol and relevant parts from the specified connection URL.
* The caller must free() the returned strings.
*/
static enum protocol parse_connect_url(const char *url_orig, char **ret_host,
char **ret_path)
{
char *url;
char *host, *path;
char *end;
int separator = '/';
enum protocol protocol = PROTO_LOCAL;
if (is_url(url_orig))
url = url_decode(url_orig);
else
url = xstrdup(url_orig);
host = strstr(url, "://");
if (host) {
*host = '\0';
protocol = get_protocol(url);
host += 3;
} else {
host = url;
if (!url_is_local_not_ssh(url)) {
protocol = PROTO_SSH;
separator = ':';
}
}
/*
* Don't do destructive transforms as protocol code does
* '[]' unwrapping in get_host_and_port()
*/
end = host_end(&host, 0);
if (protocol == PROTO_LOCAL)
path = end;
else if (protocol == PROTO_FILE && has_dos_drive_prefix(end))
path = end; /* "file://$(pwd)" may be "file://C:/projects/repo" */
else
path = strchr(end, separator);
if (!path || !*path)
die("No path specified. See 'man git-pull' for valid url syntax");
/*
* null-terminate hostname and point path to ~ for URL's like this:
* ssh://host.xz/~user/repo
*/
end = path; /* Need to \0 terminate host here */
if (separator == ':')
path++; /* path starts after ':' */
if (protocol == PROTO_GIT || protocol == PROTO_SSH) {
if (path[1] == '~')
path++;
}
path = xstrdup(path);
*end = '\0';
*ret_host = xstrdup(host);
*ret_path = path;
free(url);
return protocol;
}
static const char *get_ssh_command(void)
{
const char *ssh;
if ((ssh = getenv("GIT_SSH_COMMAND")))
return ssh;
if (!git_config_get_string_const("core.sshcommand", &ssh))
return ssh;
return NULL;
}
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)
{
const char *variant = getenv("GIT_SSH_VARIANT");
if (!variant && git_config_get_string_const("ssh.variant", &variant))
return;
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 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;
override_ssh_variant(&ssh_variant);
if (ssh_variant != VARIANT_AUTO)
return ssh_variant;
if (!is_cmdline) {
p = xstrdup(ssh_command);
variant = basename(p);
} else {
const char **ssh_argv;
p = xstrdup(ssh_command);
if (split_cmdline(p, &ssh_argv) > 0) {
variant = basename((char *)ssh_argv[0]);
/*
* At this point, variant points into the buffer
* referenced by p, hence we do not need ssh_argv
* any longer.
*/
free(ssh_argv);
} else {
free(p);
return ssh_variant;
}
}
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"))
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 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
* the connection failed).
*/
struct child_process *git_connect(int fd[2], const char *url,
const char *prog, int flags)
{
char *hostandport, *path;
struct child_process *conn;
enum protocol protocol;
/* Without this we cannot rely on waitpid() to tell
* what happened to our children.
*/
signal(SIGCHLD, SIG_DFL);
protocol = parse_connect_url(url, &hostandport, &path);
if ((flags & CONNECT_DIAG_URL) && (protocol != PROTO_SSH)) {
printf("Diag: url=%s\n", url ? url : "NULL");
printf("Diag: protocol=%s\n", prot_name(protocol));
printf("Diag: hostandport=%s\n", hostandport ? hostandport : "NULL");
printf("Diag: path=%s\n", path ? path : "NULL");
conn = NULL;
} else if (protocol == PROTO_GIT) {
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);
if (looks_like_command_line_option(path))
die("strange pathname '%s' blocked", path);
strbuf_addstr(&cmd, prog);
strbuf_addch(&cmd, ' ');
sq_quote_buf(&cmd, path);
/* remove repo-local variables from the environment */
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) {
char *ssh_host = hostandport;
const char *port = NULL;
transport_check_allowed("ssh");
get_host_and_port(&ssh_host, &port);
if (!port)
port = get_port(ssh_host);
if (flags & CONNECT_DIAG_URL) {
printf("Diag: url=%s\n", url ? url : "NULL");
printf("Diag: protocol=%s\n", prot_name(protocol));
printf("Diag: userandhost=%s\n", ssh_host ? ssh_host : "NULL");
printf("Diag: port=%s\n", port ? port : "NONE");
printf("Diag: path=%s\n", path ? path : "NULL");
free(hostandport);
free(path);
free(conn);
strbuf_release(&cmd);
return NULL;
}
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);
if (start_command(conn))
die("unable to fork");
fd[0] = conn->out; /* read from child's stdout */
fd[1] = conn->in; /* write to child's stdin */
strbuf_release(&cmd);
}
free(hostandport);
free(path);
return conn;
}
int finish_connect(struct child_process *conn)
{
int code;
if (!conn || git_connection_is_socket(conn))
return 0;
code = finish_command(conn);
free(conn);
return code;
}