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-rw-r--r--connect.c657
1 files changed, 657 insertions, 0 deletions
diff --git a/connect.c b/connect.c
new file mode 100644
index 0000000..02e738a
--- /dev/null
+++ b/connect.c
@@ -0,0 +1,657 @@
+#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_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);
+}
+
+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++;
+}
+
+/*
+ * 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,
+ struct extra_have_objects *extra_have)
+{
+ *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 > 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) {
+ free(server_capabilities);
+ server_capabilities = xstrdup(name + name_len + 1);
+ }
+
+ 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;
+ if (nr_match && !path_match(name, nr_match, match))
+ continue;
+ ref = alloc_ref(buffer + 41);
+ hashcpy(ref->old_sha1, old_sha1);
+ *list = ref;
+ list = &ref->next;
+ }
+ return list;
+}
+
+int server_supports(const char *feature)
+{
+ return server_capabilities &&
+ strstr(server_capabilities, feature) != NULL;
+}
+
+int path_match(const char *path, int nr, char **match)
+{
+ int i;
+ int pathlen = strlen(path);
+
+ for (i = 0; i < nr; i++) {
+ char *s = match[i];
+ int len = strlen(s);
+
+ if (!len || len > pathlen)
+ continue;
+ if (memcmp(path + pathlen - len, s, len))
+ continue;
+ if (pathlen > len && path[pathlen - len - 1] != '/')
+ continue;
+ *s = 0;
+ 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)
+
+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;
+ }
+}
+
+#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)
+{
+ int sockfd = -1, saved_errno = 0;
+ 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) {
+ 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;
+ }
+
+ 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 */
+
+/*
+ * Returns a connected socket() fd, or else die()s.
+ */
+static int git_tcp_connect_sock(char *host, int flags)
+{
+ int sockfd = -1, saved_errno = 0;
+ 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++) {
+ 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 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 void git_proxy_connect(int fd[2], char *host)
+{
+ const char *port = STR(DEFAULT_GIT_PORT);
+ const char *argv[4];
+ struct child_process proxy;
+
+ get_host_and_port(&host, &port);
+
+ 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
+
+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;
+ 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);
+
+ 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(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
+ git_tcp_connect(fd, host, 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(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(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 finish_connect(struct child_process *conn)
+{
+ int code;
+ if (!conn || conn == &no_fork)
+ return 0;
+
+ code = finish_command(conn);
+ free(conn->argv);
+ free(conn);
+ return code;
+}
+
+char *git_getpass(const char *prompt)
+{
+ char *askpass;
+ struct child_process pass;
+ const char *args[3];
+ static struct strbuf buffer = STRBUF_INIT;
+
+ askpass = getenv("GIT_ASKPASS");
+
+ if (!askpass || !(*askpass))
+ return getpass(prompt);
+
+ args[0] = askpass;
+ args[1] = prompt;
+ args[2] = NULL;
+
+ memset(&pass, 0, sizeof(pass));
+ pass.argv = args;
+ pass.out = -1;
+
+ if (start_command(&pass))
+ exit(1);
+
+ strbuf_reset(&buffer);
+ if (strbuf_read(&buffer, pass.out, 20) < 0)
+ die("failed to read password from %s\n", askpass);
+
+ close(pass.out);
+
+ if (finish_command(&pass))
+ exit(1);
+
+ strbuf_setlen(&buffer, strcspn(buffer.buf, "\r\n"));
+
+ return buffer.buf;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-21 16:14:31 +0000