+#include "git-compat-util.h"
#include "cache.h"
#include "pkt-line.h"
-#include <sys/wait.h>
+#include "quote.h"
+#include "refs.h"
+#include "run-command.h"
+#include "remote.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_ref_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);
+}
+
+/*
+ * Read all the refs from the other end
+ */
+struct ref **get_remote_heads(int in, struct ref **list,
+ int nr_match, char **match,
+ unsigned int flags)
+{
+ *list = NULL;
+ for (;;) {
+ struct ref *ref;
+ unsigned char old_sha1[20];
+ static char buffer[1000];
+ char *name;
+ int len, name_len;
+
+ len = packet_read_line(in, buffer, sizeof(buffer));
+ if (!len)
+ break;
+ if (buffer[len-1] == '\n')
+ buffer[--len] = 0;
+
+ 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) {
+ free(server_capabilities);
+ server_capabilities = xstrdup(name + name_len + 1);
+ }
+
+ if (!check_ref(name, name_len, flags))
+ continue;
+ if (nr_match && !path_match(name, nr_match, match))
+ continue;
+ ref = alloc_ref(name_len + 1);
+ hashcpy(ref->old_sha1, old_sha1);
+ memcpy(ref->name, buffer + 41, name_len + 1);
+ *list = ref;
+ list = &ref->next;
+ }
+ return list;
+}
+
+int server_supports(const char *feature)
+{
+ return server_capabilities &&
+ strstr(server_capabilities, feature) != NULL;
+}
int get_ack(int fd, unsigned char *result_sha1)
{
line[--len] = 0;
if (!strcmp(line, "NAK"))
return 0;
- if (!strncmp(line, "ACK ", 3)) {
- if (!get_sha1_hex(line+4, result_sha1))
+ if (!prefixcmp(line, "ACK ")) {
+ if (!get_sha1_hex(line+4, result_sha1)) {
+ if (strstr(line+45, "continue"))
+ return 2;
return 1;
+ }
}
die("git-fetch_pack: expected ACK/NAK, got '%s'", line);
}
if (pathlen > len && path[pathlen - len - 1] != '/')
continue;
*s = 0;
- return 1;
+ return (i + 1);
}
return 0;
}
+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)
+
+#ifndef NO_IPV6
+
+static const char *ai_name(const struct addrinfo *ai)
+{
+ static char addr[INET_ADDRSTRLEN];
+ if ( AF_INET == ai->ai_family ) {
+ struct sockaddr_in *in;
+ in = (struct sockaddr_in *)ai->ai_addr;
+ inet_ntop(ai->ai_family, &in->sin_addr, addr, sizeof(addr));
+ } else if ( AF_INET6 == ai->ai_family ) {
+ struct sockaddr_in6 *in;
+ in = (struct sockaddr_in6 *)ai->ai_addr;
+ inet_ntop(ai->ai_family, &in->sin6_addr, addr, sizeof(addr));
+ } else {
+ strcpy(addr, "(unknown)");
+ }
+ return addr;
+}
+
/*
- * First, make it shell-safe. We do this by just disallowing any
- * special characters. Somebody who cares can do escaping and let
- * through the rest. But since we're doing to feed this to ssh as
- * a command line, we're going to be pretty damn anal for now.
+ * Returns a connected socket() fd, or else die()s.
*/
-static char *shell_safe(char *url)
+static int git_tcp_connect_sock(char *host, int flags)
{
- char *n = url;
- unsigned char c;
- static const char flags[256] = {
- ['0'...'9'] = 1,
- ['a'...'z'] = 1,
- ['A'...'Z'] = 1,
- ['.'] = 1, ['/'] = 1,
- ['-'] = 1, ['+'] = 1,
- [':'] = 1, ['_'] = 1,
- ['@'] = 1, [','] = 1,
- ['~'] = 1, ['^'] = 1,
- };
+ int sockfd = -1, saved_errno = 0;
+ char *colon, *end;
+ const char *port = STR(DEFAULT_GIT_PORT);
+ struct addrinfo hints, *ai0, *ai;
+ int gai;
+ int cnt = 0;
+
+ 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;
+ 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));
- while ((c = *n++) != 0) {
- if (flags[c] != 1)
- die("I don't like '%c'. Sue me.", c);
+ if (flags & CONNECT_VERBOSE)
+ fprintf(stderr, "done.\nConnecting to %s (port %s) ... ", host, port);
+
+ for (ai0 = ai; ai; ai = ai->ai_next) {
+ sockfd = socket(ai->ai_family,
+ ai->ai_socktype, ai->ai_protocol);
+ if (sockfd < 0) {
+ saved_errno = errno;
+ continue;
+ }
+ if (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
+ saved_errno = errno;
+ fprintf(stderr, "%s[%d: %s]: errno=%s\n",
+ host,
+ cnt,
+ ai_name(ai),
+ strerror(saved_errno));
+ close(sockfd);
+ sockfd = -1;
+ continue;
+ }
+ if (flags & CONNECT_VERBOSE)
+ fprintf(stderr, "%s ", ai_name(ai));
+ break;
}
- return url;
+
+ freeaddrinfo(ai0);
+
+ if (sockfd < 0)
+ die("unable to connect a socket (%s)", strerror(saved_errno));
+
+ if (flags & CONNECT_VERBOSE)
+ fprintf(stderr, "done.\n");
+
+ return sockfd;
}
+#else /* NO_IPV6 */
+
/*
- * Yeah, yeah, fixme. Need to pass in the heads etc.
+ * Returns a connected socket() fd, or else die()s.
*/
-int git_connect(int fd[2], char *url, const char *prog)
-{
- char command[1024];
- const char *host, *path;
- char *colon;
- int pipefd[2][2];
- pid_t pid;
-
- url = shell_safe(url);
- host = NULL;
- path = url;
- colon = strchr(url, ':');
+static int git_tcp_connect_sock(char *host, int flags)
+{
+ int sockfd = -1, saved_errno = 0;
+ char *colon, *end;
+ char *port = STR(DEFAULT_GIT_PORT), *ep;
+ struct hostent *he;
+ struct sockaddr_in sa;
+ char **ap;
+ unsigned int nport;
+ int cnt;
+
+ 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;
+ }
+
+ 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\n", 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++) {
+ sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
+ if (sockfd < 0) {
+ saved_errno = errno;
+ continue;
+ }
+
+ memset(&sa, 0, sizeof sa);
+ sa.sin_family = he->h_addrtype;
+ sa.sin_port = htons(nport);
+ memcpy(&sa.sin_addr, *ap, he->h_length);
+
+ if (connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
+ saved_errno = errno;
+ fprintf(stderr, "%s[%d: %s]: errno=%s\n",
+ host,
+ cnt,
+ inet_ntoa(*(struct in_addr *)&sa.sin_addr),
+ strerror(saved_errno));
+ 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 a socket (%s)", strerror(saved_errno));
+
+ 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 const char *rhost_name;
+static int rhost_len;
+
+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;
+
+ 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)
+{
+ rhost_name = host;
+ rhost_len = strlen(host);
+ git_proxy_command = getenv("GIT_PROXY_COMMAND");
+ git_config(git_proxy_command_options, NULL);
+ rhost_name = NULL;
+ return (git_proxy_command && *git_proxy_command);
+}
+
+static void git_proxy_connect(int fd[2], char *host)
+{
+ const char *port = STR(DEFAULT_GIT_PORT);
+ char *colon, *end;
+ const char *argv[4];
+ struct child_process proxy;
+
+ 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;
+ }
+
+ argv[0] = git_proxy_command;
+ argv[1] = host;
+ argv[2] = port;
+ argv[3] = NULL;
+ memset(&proxy, 0, sizeof(proxy));
+ proxy.argv = argv;
+ proxy.in = -1;
+ proxy.out = -1;
+ if (start_command(&proxy))
+ die("cannot start proxy %s", argv[0]);
+ fd[0] = proxy.out; /* read from proxy stdout */
+ fd[1] = proxy.in; /* write to proxy stdin */
+}
+
+#define MAX_CMD_LEN 1024
+
+char *get_port(char *host)
+{
+ char *end;
+ char *p = strchr(host, ':');
+
+ if (p) {
+ strtol(p+1, &end, 10);
+ if (*end == '\0') {
+ *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 = xstrdup(url_orig);
+ char *host, *path = url;
+ char *end;
+ int c;
+ struct child_process *conn;
+ 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);
+
+ host = strstr(url, "://");
+ if(host) {
+ *host = '\0';
+ protocol = get_protocol(url);
+ host += 3;
+ c = '/';
+ } else {
host = url;
- path = colon+1;
- }
- snprintf(command, sizeof(command), "%s %s", prog, path);
- if (pipe(pipefd[0]) < 0 || pipe(pipefd[1]) < 0)
- die("unable to create pipe pair for communication");
- pid = fork();
- if (!pid) {
- dup2(pipefd[1][0], 0);
- dup2(pipefd[0][1], 1);
- close(pipefd[0][0]);
- close(pipefd[0][1]);
- close(pipefd[1][0]);
- close(pipefd[1][1]);
- if (host)
- execlp("ssh", "ssh", host, command, NULL);
+ c = ':';
+ }
+
+ if (host[0] == '[') {
+ end = strchr(host + 1, ']');
+ if (end) {
+ *end = 0;
+ end++;
+ host++;
+ } else
+ end = host;
+ } else
+ end = host;
+
+ path = strchr(end, c);
+ if (path) {
+ 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(host);
+
+ if (protocol == PROTO_GIT) {
+ /* These underlying connection commands die() if they
+ * cannot connect.
+ */
+ char *target_host = xstrdup(host);
+ if (git_use_proxy(host))
+ git_proxy_connect(fd, host);
else
- execlp("sh", "sh", "-c", command, NULL);
- die("exec failed");
- }
- fd[0] = pipefd[0][0];
- fd[1] = pipefd[1][1];
- close(pipefd[0][1]);
- close(pipefd[1][0]);
- return pid;
+ git_tcp_connect(fd, host, flags);
+ /*
+ * Separate original protocol components prog and path
+ * from extended components with a NUL byte.
+ */
+ 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);
+ return &no_fork;
+ }
+
+ 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(6, sizeof(*arg));
+ if (protocol == PROTO_SSH) {
+ const char *ssh = getenv("GIT_SSH");
+ if (!ssh) ssh = "ssh";
+
+ *arg++ = ssh;
+ if (port) {
+ *arg++ = "-p";
+ *arg++ = port;
+ }
+ *arg++ = host;
+ }
+ else {
+ /* remove these from the environment */
+ const char *env[] = {
+ ALTERNATE_DB_ENVIRONMENT,
+ DB_ENVIRONMENT,
+ GIT_DIR_ENVIRONMENT,
+ GIT_WORK_TREE_ENVIRONMENT,
+ GRAFT_ENVIRONMENT,
+ INDEX_ENVIRONMENT,
+ NULL
+ };
+ conn->env = env;
+ *arg++ = "sh";
+ *arg++ = "-c";
+ }
+ *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 finish_connect(pid_t pid)
+int finish_connect(struct child_process *conn)
{
- int ret;
+ int code;
+ if (!conn || conn == &no_fork)
+ return 0;
- for (;;) {
- ret = waitpid(pid, NULL, 0);
- if (!ret)
- break;
- if (errno != EINTR)
- break;
- }
- return ret;
+ code = finish_command(conn);
+ free(conn->argv);
+ free(conn);
+ return code;
}