diff options
Diffstat (limited to 'connect.c')
| -rw-r--r-- | connect.c | 565 |
1 files changed, 394 insertions, 171 deletions
@@ -5,32 +5,33 @@ #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" static char *server_capabilities; +static const char *parse_feature_value(const char *, const char *, int *); -static int check_ref(const char *name, int len, unsigned int flags) +static int check_ref(const char *name, unsigned int flags) { if (!flags) return 1; - if (len < 5 || memcmp(name, "refs/", 5)) + if (!skip_prefix(name, "refs/", &name)) 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)) + if ((flags & REF_HEADS) && starts_with(name, "heads/")) return 1; /* REF_TAGS means that we want tags */ - if ((flags & REF_TAGS) && !memcmp(name, "tags/", 5)) + if ((flags & REF_TAGS) && starts_with(name, "tags/")) return 1; /* All type bits clear means that we are ok with anything */ @@ -39,115 +40,282 @@ static int check_ref(const char *name, int len, unsigned int flags) int check_ref_type(const struct ref *ref, int flags) { - return check_ref(ref->name, strlen(ref->name), flags); + return check_ref(ref->name, flags); +} + +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."); } -static void add_extra_have(struct extra_have_objects *extra, unsigned char *sha1) +static void parse_one_symref_info(struct string_list *symref, const char *val, int len) { - ALLOC_GROW(extra->array, extra->nr + 1, extra->alloc); - hashcpy(&(extra->array[extra->nr][0]), sha1); - extra->nr++; + 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(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 all the refs from the other end */ -struct ref **get_remote_heads(int in, struct ref **list, - unsigned int flags, - struct extra_have_objects *extra_have) +struct ref **get_remote_heads(int in, char *src_buf, size_t src_len, + struct ref **list, unsigned int flags, + struct sha1_array *extra_have, + struct sha1_array *shallow_points) { + struct ref **orig_list = list; + int got_at_least_one_head = 0; + *list = NULL; for (;;) { struct ref *ref; - unsigned char old_sha1[20]; - static char buffer[1000]; + 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(got_at_least_one_head); - 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 > 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"); + sha1_array_append(shallow_points, old_oid.hash); + continue; + } - if (len < 42 || get_sha1_hex(buffer, old_sha1) || buffer[40] != ' ') + 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 + 41; + name = buffer + GIT_SHA1_HEXSZ + 1; name_len = strlen(name); - if (len != name_len + 41) { + if (len != name_len + GIT_SHA1_HEXSZ + 1) { 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); + if (extra_have && !strcmp(name, ".have")) { + sha1_array_append(extra_have, old_oid.hash); continue; } - if (!check_ref(name, name_len, flags)) + if (!check_ref(name, flags)) continue; - ref = alloc_ref(buffer + 41); - hashcpy(ref->old_sha1, old_sha1); + ref = alloc_ref(buffer + GIT_SHA1_HEXSZ + 1); + oidcpy(&ref->old_oid, &old_oid); *list = ref; list = &ref->next; + got_at_least_one_head = 1; } + + 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_capabilities && - strstr(server_capabilities, feature) != NULL; + 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); +} + +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")) + if (!strcmp(name, "git+ssh")) /* deprecated - do not use */ return PROTO_SSH; - if (!strcmp(name, "ssh+git")) + if (!strcmp(name, "ssh+git")) /* deprecated - do not use */ return PROTO_SSH; if (!strcmp(name, "file")) - return PROTO_LOCAL; + 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; - - if (*host[0] == '[') { - end = strchr(*host + 1, ']'); - if (end) { - *end = 0; - end++; - (*host)++; - } else - end = *host; - } else - end = *host; + end = host_end(host, 1); colon = strchr(end, ':'); - if (colon) { - *colon = 0; - *port = colon + 1; + 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; + } } } @@ -167,7 +335,7 @@ 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)"); + xsnprintf(addr, sizeof(addr), "(unknown)"); return addr; } @@ -189,6 +357,10 @@ static int git_tcp_connect_sock(char *host, int flags) 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; @@ -381,29 +553,24 @@ static int git_use_proxy(const char *host) static struct child_process *git_proxy_connect(int fd[2], char *host) { const char *port = STR(DEFAULT_GIT_PORT); - const char **argv; struct child_process *proxy; get_host_and_port(&host, &port); - argv = xmalloc(sizeof(*argv) * 4); - argv[0] = git_proxy_command; - argv[1] = host; - argv[2] = port; - argv[3] = NULL; - proxy = xcalloc(1, sizeof(*proxy)); - proxy->argv = argv; + 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", argv[0]); + 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; } -#define MAX_CMD_LEN 1024 - static char *get_port(char *host) { char *end; @@ -420,37 +587,18 @@ static char *get_port(char *host) 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). + * Extract protocol and relevant parts from the specified connection URL. + * The caller must free() the returned strings. */ -struct child_process *git_connect(int fd[2], const char *url_orig, - const char *prog, int flags) +static enum protocol parse_connect_url(const char *url_orig, char **ret_host, + char **ret_path) { char *url; char *host, *path; char *end; - int c; - struct child_process *conn = &no_fork; + int separator = '/'; 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); @@ -462,37 +610,26 @@ struct child_process *git_connect(int fd[2], const char *url_orig, *host = '\0'; protocol = get_protocol(url); host += 3; - c = '/'; } else { host = url; - c = ':'; + if (!url_is_local_not_ssh(url)) { + protocol = PROTO_SSH; + separator = ':'; + } } /* - * Don't do destructive transforms with git:// as that - * protocol code does '[]' unwrapping of its own. + * Don't do destructive transforms as protocol code does + * '[]' unwrapping in get_host_and_port() */ - if (host[0] == '[') { - end = strchr(host + 1, ']'); - if (end) { - if (protocol != PROTO_GIT) { - *end = 0; - host++; - } - end++; - } else - end = host; - } else - end = host; + end = host_end(&host, 0); - path = strchr(end, c); - if (path && !has_dos_drive_prefix(end)) { - if (c == ':') { - protocol = PROTO_SSH; - *path++ = '\0'; - } - } else + 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"); @@ -501,33 +638,78 @@ struct child_process *git_connect(int fd[2], const char *url_orig, * 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; + + 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++; - else { - path = xstrdup(ptr); - free_path = 1; - } - - *ptr = '\0'; } - /* - * Add support for ssh port: ssh://host.xy:<port>/... + path = xstrdup(path); + *end = '\0'; + + *ret_host = xstrdup(host); + *ret_path = path; + free(url); + return protocol; +} + +static struct child_process no_fork = CHILD_PROCESS_INIT; + +/* + * 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, + const char *prog, int flags) +{ + char *hostandport, *path; + struct child_process *conn = &no_fork; + enum protocol protocol; + struct strbuf cmd = STRBUF_INIT; + + /* Without this we cannot rely on waitpid() to tell + * what happened to our children. */ - if (protocol == PROTO_SSH && host != url) - port = get_port(host); + 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) { + /* + * 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"); - if (protocol == PROTO_GIT) { /* These underlying connection commands die() if they * cannot connect. */ - char *target_host = xstrdup(host); - if (git_use_proxy(host)) - conn = git_proxy_connect(fd, host); + if (git_use_proxy(hostandport)) + conn = git_proxy_connect(fd, hostandport); else - git_tcp_connect(fd, host, flags); + git_tcp_connect(fd, hostandport, flags); /* * Separate original protocol components prog and path * from extended host header with a NUL byte. @@ -540,55 +722,97 @@ struct child_process *git_connect(int fd[2], const char *url_orig, prog, path, 0, target_host, 0); free(target_host); - free(url); - if (free_path) - free(path); - return conn; - } + } else { + conn = xmalloc(sizeof(*conn)); + child_process_init(conn); + + strbuf_addstr(&cmd, prog); + strbuf_addch(&cmd, ' '); + sq_quote_buf(&cmd, path); - 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; + conn->in = conn->out = -1; + if (protocol == PROTO_SSH) { + const char *ssh; + int putty = 0, tortoiseplink = 0; + 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); + return NULL; + } - if (start_command(conn)) - die("unable to fork"); + ssh = getenv("GIT_SSH_COMMAND"); + if (!ssh) { + const char *base; + char *ssh_dup; - 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); + /* + * 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"; + + ssh_dup = xstrdup(ssh); + base = basename(ssh_dup); + + tortoiseplink = !strcasecmp(base, "tortoiseplink") || + !strcasecmp(base, "tortoiseplink.exe"); + putty = tortoiseplink || + !strcasecmp(base, "plink") || + !strcasecmp(base, "plink.exe"); + + free(ssh_dup); + } + + 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 (tortoiseplink) + argv_array_push(&conn->args, "-batch"); + if (port) { + /* P is for PuTTY, p is for OpenSSH */ + argv_array_push(&conn->args, putty ? "-P" : "-p"); + argv_array_push(&conn->args, port); + } + argv_array_push(&conn->args, ssh_host); + } else { + transport_check_allowed("file"); + } + 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; } @@ -604,7 +828,6 @@ int finish_connect(struct child_process *conn) return 0; code = finish_command(conn); - free(conn->argv); free(conn); return code; } |