git/connect.c

673 lines
15 KiB
C
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#include "git-compat-util.h"
#include "cache.h"
#include "pkt-line.h"
#include "quote.h"
#include "refs.h"
#include "run-command.h"
#include "remote.h"
#include "url.h"
static char *server_capabilities;
static int check_ref(const char *name, int len, unsigned int flags)
{
if (!flags)
return 1;
if (len < 5 || memcmp(name, "refs/", 5))
return 0;
/* Skip the "refs/" part */
name += 5;
len -= 5;
/* 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) && !memcmp(name, "heads/", 6))
return 1;
/* REF_TAGS means that we want tags */
if ((flags & REF_TAGS) && !memcmp(name, "tags/", 5))
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, strlen(ref->name), flags);
}
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static void add_extra_have(struct extra_have_objects *extra, unsigned char *sha1)
{
ALLOC_GROW(extra->array, extra->nr + 1, extra->alloc);
hashcpy(&(extra->array[extra->nr][0]), sha1);
extra->nr++;
}
static void die_initial_contact(int got_at_least_one_head)
{
if (got_at_least_one_head)
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.");
}
/*
* Read all the refs from the other end
*/
struct ref **get_remote_heads(int in, struct ref **list,
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unsigned int flags,
struct extra_have_objects *extra_have)
{
int got_at_least_one_head = 0;
*list = NULL;
for (;;) {
struct ref *ref;
unsigned char old_sha1[20];
static char buffer[1000];
char *name;
int len, name_len;
len = packet_read(in, buffer, sizeof(buffer));
if (len < 0)
die_initial_contact(got_at_least_one_head);
if (!len)
break;
if (buffer[len-1] == '\n')
buffer[--len] = 0;
if (len > 4 && !prefixcmp(buffer, "ERR "))
die("remote error: %s", buffer + 4);
if (len < 42 || get_sha1_hex(buffer, old_sha1) || buffer[40] != ' ')
die("protocol error: expected sha/ref, got '%s'", buffer);
name = buffer + 41;
name_len = strlen(name);
if (len != name_len + 41) {
Avoid unnecessary "if-before-free" tests. This change removes all obvious useless if-before-free tests. E.g., it replaces code like this: if (some_expression) free (some_expression); with the now-equivalent: free (some_expression); It is equivalent not just because POSIX has required free(NULL) to work for a long time, but simply because it has worked for so long that no reasonable porting target fails the test. Here's some evidence from nearly 1.5 years ago: http://www.winehq.org/pipermail/wine-patches/2006-October/031544.html FYI, the change below was prepared by running the following: git ls-files -z | xargs -0 \ perl -0x3b -pi -e \ 's/\bif\s*\(\s*(\S+?)(?:\s*!=\s*NULL)?\s*\)\s+(free\s*\(\s*\1\s*\))/$2/s' Note however, that it doesn't handle brace-enclosed blocks like "if (x) { free (x); }". But that's ok, since there were none like that in git sources. Beware: if you do use the above snippet, note that it can produce syntactically invalid C code. That happens when the affected "if"-statement has a matching "else". E.g., it would transform this if (x) free (x); else foo (); into this: free (x); else foo (); There were none of those here, either. If you're interested in automating detection of the useless tests, you might like the useless-if-before-free script in gnulib: [it *does* detect brace-enclosed free statements, and has a --name=S option to make it detect free-like functions with different names] http://git.sv.gnu.org/gitweb/?p=gnulib.git;a=blob;f=build-aux/useless-if-before-free Addendum: Remove one more (in imap-send.c), spotted by Jean-Luc Herren <jlh@gmx.ch>. Signed-off-by: Jim Meyering <meyering@redhat.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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free(server_capabilities);
server_capabilities = xstrdup(name + name_len + 1);
}
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if (extra_have &&
name_len == 5 && !memcmp(".have", name, 5)) {
add_extra_have(extra_have, old_sha1);
continue;
}
if (!check_ref(name, name_len, flags))
continue;
ref = alloc_ref(buffer + 41);
hashcpy(ref->old_sha1, old_sha1);
*list = ref;
list = &ref->next;
got_at_least_one_head = 1;
}
return list;
}
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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;
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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;
}
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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_SSH,
PROTO_GIT
};
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"))
return PROTO_SSH;
if (!strcmp(name, "ssh+git"))
return PROTO_SSH;
if (!strcmp(name, "file"))
return PROTO_LOCAL;
die("I don't handle protocol '%s'", name);
}
#define STR_(s) # s
#define STR(s) STR_(s)
static void get_host_and_port(char **host, const char **port)
{
char *colon, *end;
if (*host[0] == '[') {
end = strchr(*host + 1, ']');
if (end) {
*end = 0;
end++;
(*host)++;
} else
end = *host;
} else
end = *host;
colon = strchr(end, ':');
if (colon) {
*colon = 0;
*port = colon + 1;
}
}
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)
strcpy(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));
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;
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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 */
static void 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);
}
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);
}
connect: treat generic proxy processes like ssh processes The git_connect function returns two ends of a pipe for talking with a remote, plus a struct child_process representing the other end of the pipe. If we have a direct socket connection, then this points to a special "no_fork" child process. The code path for doing git-over-pipes or git-over-ssh sets up this child process to point to the child git command or the ssh process. When we call finish_connect eventually, we check wait() on the command and report its return value. The code path for git://, on the other hand, always sets it to no_fork. In the case of a direct TCP connection, this makes sense; we have no child process. But in the case of a proxy command (configured by core.gitproxy), we do have a child process, but we throw away its pid, and therefore ignore its return code. Instead, let's keep that information in the proxy case, and respect its return code, which can help catch some errors (though depending on your proxy command, it will be errors reported by the proxy command itself, and not propagated from git commands. Still, it is probably better to propagate such errors than to ignore them). It also means that the child_process field can reliably be used to determine whether the returned descriptors are actually a full-duplex socket, which means we should be using shutdown() instead of a simple close. Signed-off-by: Jeff King <peff@peff.net> Helped-by: Johannes Sixt <j6t@kdbg.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-05-16 06:46:07 +00:00
static struct child_process *git_proxy_connect(int fd[2], char *host)
{
const char *port = STR(DEFAULT_GIT_PORT);
connect: treat generic proxy processes like ssh processes The git_connect function returns two ends of a pipe for talking with a remote, plus a struct child_process representing the other end of the pipe. If we have a direct socket connection, then this points to a special "no_fork" child process. The code path for doing git-over-pipes or git-over-ssh sets up this child process to point to the child git command or the ssh process. When we call finish_connect eventually, we check wait() on the command and report its return value. The code path for git://, on the other hand, always sets it to no_fork. In the case of a direct TCP connection, this makes sense; we have no child process. But in the case of a proxy command (configured by core.gitproxy), we do have a child process, but we throw away its pid, and therefore ignore its return code. Instead, let's keep that information in the proxy case, and respect its return code, which can help catch some errors (though depending on your proxy command, it will be errors reported by the proxy command itself, and not propagated from git commands. Still, it is probably better to propagate such errors than to ignore them). It also means that the child_process field can reliably be used to determine whether the returned descriptors are actually a full-duplex socket, which means we should be using shutdown() instead of a simple close. Signed-off-by: Jeff King <peff@peff.net> Helped-by: Johannes Sixt <j6t@kdbg.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-05-16 06:46:07 +00:00
const char **argv;
struct child_process *proxy;
get_host_and_port(&host, &port);
connect: treat generic proxy processes like ssh processes The git_connect function returns two ends of a pipe for talking with a remote, plus a struct child_process representing the other end of the pipe. If we have a direct socket connection, then this points to a special "no_fork" child process. The code path for doing git-over-pipes or git-over-ssh sets up this child process to point to the child git command or the ssh process. When we call finish_connect eventually, we check wait() on the command and report its return value. The code path for git://, on the other hand, always sets it to no_fork. In the case of a direct TCP connection, this makes sense; we have no child process. But in the case of a proxy command (configured by core.gitproxy), we do have a child process, but we throw away its pid, and therefore ignore its return code. Instead, let's keep that information in the proxy case, and respect its return code, which can help catch some errors (though depending on your proxy command, it will be errors reported by the proxy command itself, and not propagated from git commands. Still, it is probably better to propagate such errors than to ignore them). It also means that the child_process field can reliably be used to determine whether the returned descriptors are actually a full-duplex socket, which means we should be using shutdown() instead of a simple close. Signed-off-by: Jeff King <peff@peff.net> Helped-by: Johannes Sixt <j6t@kdbg.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-05-16 06:46:07 +00:00
argv = xmalloc(sizeof(*argv) * 4);
argv[0] = git_proxy_command;
argv[1] = host;
argv[2] = port;
argv[3] = NULL;
connect: treat generic proxy processes like ssh processes The git_connect function returns two ends of a pipe for talking with a remote, plus a struct child_process representing the other end of the pipe. If we have a direct socket connection, then this points to a special "no_fork" child process. The code path for doing git-over-pipes or git-over-ssh sets up this child process to point to the child git command or the ssh process. When we call finish_connect eventually, we check wait() on the command and report its return value. The code path for git://, on the other hand, always sets it to no_fork. In the case of a direct TCP connection, this makes sense; we have no child process. But in the case of a proxy command (configured by core.gitproxy), we do have a child process, but we throw away its pid, and therefore ignore its return code. Instead, let's keep that information in the proxy case, and respect its return code, which can help catch some errors (though depending on your proxy command, it will be errors reported by the proxy command itself, and not propagated from git commands. Still, it is probably better to propagate such errors than to ignore them). It also means that the child_process field can reliably be used to determine whether the returned descriptors are actually a full-duplex socket, which means we should be using shutdown() instead of a simple close. Signed-off-by: Jeff King <peff@peff.net> Helped-by: Johannes Sixt <j6t@kdbg.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-05-16 06:46:07 +00:00
proxy = xcalloc(1, sizeof(*proxy));
proxy->argv = argv;
proxy->in = -1;
proxy->out = -1;
if (start_command(proxy))
die("cannot start proxy %s", argv[0]);
connect: treat generic proxy processes like ssh processes The git_connect function returns two ends of a pipe for talking with a remote, plus a struct child_process representing the other end of the pipe. If we have a direct socket connection, then this points to a special "no_fork" child process. The code path for doing git-over-pipes or git-over-ssh sets up this child process to point to the child git command or the ssh process. When we call finish_connect eventually, we check wait() on the command and report its return value. The code path for git://, on the other hand, always sets it to no_fork. In the case of a direct TCP connection, this makes sense; we have no child process. But in the case of a proxy command (configured by core.gitproxy), we do have a child process, but we throw away its pid, and therefore ignore its return code. Instead, let's keep that information in the proxy case, and respect its return code, which can help catch some errors (though depending on your proxy command, it will be errors reported by the proxy command itself, and not propagated from git commands. Still, it is probably better to propagate such errors than to ignore them). It also means that the child_process field can reliably be used to determine whether the returned descriptors are actually a full-duplex socket, which means we should be using shutdown() instead of a simple close. Signed-off-by: Jeff King <peff@peff.net> Helped-by: Johannes Sixt <j6t@kdbg.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-05-16 06:46:07 +00:00
fd[0] = proxy->out; /* read from proxy stdout */
fd[1] = proxy->in; /* write to proxy stdin */
return proxy;
}
#define MAX_CMD_LEN 1024
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;
}
static struct child_process no_fork;
/*
* 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).
*
* 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_orig,
const char *prog, int flags)
{
char *url;
char *host, *path;
char *end;
int c;
connect: treat generic proxy processes like ssh processes The git_connect function returns two ends of a pipe for talking with a remote, plus a struct child_process representing the other end of the pipe. If we have a direct socket connection, then this points to a special "no_fork" child process. The code path for doing git-over-pipes or git-over-ssh sets up this child process to point to the child git command or the ssh process. When we call finish_connect eventually, we check wait() on the command and report its return value. The code path for git://, on the other hand, always sets it to no_fork. In the case of a direct TCP connection, this makes sense; we have no child process. But in the case of a proxy command (configured by core.gitproxy), we do have a child process, but we throw away its pid, and therefore ignore its return code. Instead, let's keep that information in the proxy case, and respect its return code, which can help catch some errors (though depending on your proxy command, it will be errors reported by the proxy command itself, and not propagated from git commands. Still, it is probably better to propagate such errors than to ignore them). It also means that the child_process field can reliably be used to determine whether the returned descriptors are actually a full-duplex socket, which means we should be using shutdown() instead of a simple close. Signed-off-by: Jeff King <peff@peff.net> Helped-by: Johannes Sixt <j6t@kdbg.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-05-16 06:46:07 +00:00
struct child_process *conn = &no_fork;
enum protocol protocol = PROTO_LOCAL;
int free_path = 0;
char *port = NULL;
const char **arg;
struct strbuf cmd;
/* Without this we cannot rely on waitpid() to tell
* what happened to our children.
*/
signal(SIGCHLD, SIG_DFL);
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;
c = '/';
} else {
host = url;
c = ':';
}
/*
* Don't do destructive transforms with git:// as that
* protocol code does '[]' unwrapping of its own.
*/
if (host[0] == '[') {
end = strchr(host + 1, ']');
if (end) {
if (protocol != PROTO_GIT) {
*end = 0;
host++;
}
end++;
} else
end = host;
} else
end = host;
path = strchr(end, c);
if (path && !has_dos_drive_prefix(end)) {
if (c == ':') {
protocol = PROTO_SSH;
*path++ = '\0';
}
} else
path = end;
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
*/
if (protocol != PROTO_LOCAL && host != url) {
char *ptr = path;
if (path[1] == '~')
path++;
else {
path = xstrdup(ptr);
free_path = 1;
}
*ptr = '\0';
}
/*
* Add support for ssh port: ssh://host.xy:<port>/...
*/
if (protocol == PROTO_SSH && host != url)
port = get_port(end);
if (protocol == PROTO_GIT) {
/* These underlying connection commands die() if they
* cannot connect.
*/
char *target_host = xstrdup(host);
if (git_use_proxy(host))
connect: treat generic proxy processes like ssh processes The git_connect function returns two ends of a pipe for talking with a remote, plus a struct child_process representing the other end of the pipe. If we have a direct socket connection, then this points to a special "no_fork" child process. The code path for doing git-over-pipes or git-over-ssh sets up this child process to point to the child git command or the ssh process. When we call finish_connect eventually, we check wait() on the command and report its return value. The code path for git://, on the other hand, always sets it to no_fork. In the case of a direct TCP connection, this makes sense; we have no child process. But in the case of a proxy command (configured by core.gitproxy), we do have a child process, but we throw away its pid, and therefore ignore its return code. Instead, let's keep that information in the proxy case, and respect its return code, which can help catch some errors (though depending on your proxy command, it will be errors reported by the proxy command itself, and not propagated from git commands. Still, it is probably better to propagate such errors than to ignore them). It also means that the child_process field can reliably be used to determine whether the returned descriptors are actually a full-duplex socket, which means we should be using shutdown() instead of a simple close. Signed-off-by: Jeff King <peff@peff.net> Helped-by: Johannes Sixt <j6t@kdbg.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-05-16 06:46:07 +00:00
conn = git_proxy_connect(fd, host);
else
git_tcp_connect(fd, host, flags);
/*
* Separate original protocol components prog and path
daemon: Strictly parse the "extra arg" part of the command Since 1.4.4.5 (49ba83fb67 "Add virtualization support to git-daemon") git daemon enters an infinite loop and never terminates if a client hides any extra arguments in the initial request line which is not exactly "\0host=blah\0". Since that change, a client must never insert additional extra arguments, or attempt to use any argument other than "host=", as any daemon will get stuck parsing the request line and will never complete the request. Since the client can't tell if the daemon is patched or not, it is not possible to know if additional extra args might actually be able to be safely requested. If we ever need to extend the git daemon protocol to support a new feature, we may have to do something like this to the exchange: # If both support git:// v2 # C: 000cgit://v2 S: 0010ok host user C: 0018host git.kernel.org C: 0027git-upload-pack /pub/linux-2.6.git S: ...git-upload-pack header... # If client supports git:// v2, server does not: # C: 000cgit://v2 S: <EOF> C: 003bgit-upload-pack /pub/linux-2.6.git\0host=git.kernel.org\0 S: ...git-upload-pack header... This requires the client to create two TCP connections to talk to an older git daemon, however all daemons since the introduction of daemon.c will safely reject the unknown "git://v2" command request, so the client can quite easily determine the server supports an older protocol. Signed-off-by: Shawn O. Pearce <spearce@spearce.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2009-06-05 01:33:32 +00:00
* 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(fd[1],
"%s %s%chost=%s%c",
prog, path, 0,
target_host, 0);
free(target_host);
free(url);
if (free_path)
free(path);
connect: treat generic proxy processes like ssh processes The git_connect function returns two ends of a pipe for talking with a remote, plus a struct child_process representing the other end of the pipe. If we have a direct socket connection, then this points to a special "no_fork" child process. The code path for doing git-over-pipes or git-over-ssh sets up this child process to point to the child git command or the ssh process. When we call finish_connect eventually, we check wait() on the command and report its return value. The code path for git://, on the other hand, always sets it to no_fork. In the case of a direct TCP connection, this makes sense; we have no child process. But in the case of a proxy command (configured by core.gitproxy), we do have a child process, but we throw away its pid, and therefore ignore its return code. Instead, let's keep that information in the proxy case, and respect its return code, which can help catch some errors (though depending on your proxy command, it will be errors reported by the proxy command itself, and not propagated from git commands. Still, it is probably better to propagate such errors than to ignore them). It also means that the child_process field can reliably be used to determine whether the returned descriptors are actually a full-duplex socket, which means we should be using shutdown() instead of a simple close. Signed-off-by: Jeff King <peff@peff.net> Helped-by: Johannes Sixt <j6t@kdbg.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-05-16 06:46:07 +00:00
return conn;
}
conn = xcalloc(1, sizeof(*conn));
strbuf_init(&cmd, MAX_CMD_LEN);
strbuf_addstr(&cmd, prog);
strbuf_addch(&cmd, ' ');
sq_quote_buf(&cmd, path);
if (cmd.len >= MAX_CMD_LEN)
die("command line too long");
conn->in = conn->out = -1;
conn->argv = arg = xcalloc(7, sizeof(*arg));
if (protocol == PROTO_SSH) {
const char *ssh = getenv("GIT_SSH");
int putty = ssh && strcasestr(ssh, "plink");
if (!ssh) ssh = "ssh";
*arg++ = ssh;
if (putty && !strcasestr(ssh, "tortoiseplink"))
*arg++ = "-batch";
if (port) {
/* P is for PuTTY, p is for OpenSSH */
*arg++ = putty ? "-P" : "-p";
*arg++ = port;
}
*arg++ = host;
}
else {
/* remove repo-local variables from the environment */
conn->env = local_repo_env;
conn->use_shell = 1;
}
*arg++ = cmd.buf;
*arg = NULL;
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(url);
if (free_path)
free(path);
return conn;
}
int git_connection_is_socket(struct child_process *conn)
{
return conn == &no_fork;
}
int finish_connect(struct child_process *conn)
{
int code;
if (!conn || git_connection_is_socket(conn))
return 0;
code = finish_command(conn);
free(conn->argv);
free(conn);
return code;
}