#include "git-compat-util.h" #include "alloc.h" #include "config.h" #include "hex.h" #include "remote.h" #include "connect.h" #include "strbuf.h" #include "walker.h" #include "http.h" #include "exec-cmd.h" #include "run-command.h" #include "pkt-line.h" #include "string-list.h" #include "sideband.h" #include "strvec.h" #include "credential.h" #include "oid-array.h" #include "send-pack.h" #include "protocol.h" #include "quote.h" #include "transport.h" static struct remote *remote; /* always ends with a trailing slash */ static struct strbuf url = STRBUF_INIT; struct options { int verbosity; unsigned long depth; char *deepen_since; struct string_list deepen_not; struct string_list push_options; char *filter; unsigned progress : 1, check_self_contained_and_connected : 1, cloning : 1, update_shallow : 1, followtags : 1, dry_run : 1, thin : 1, /* One of the SEND_PACK_PUSH_CERT_* constants. */ push_cert : 2, deepen_relative : 1, /* see documentation of corresponding flag in fetch-pack.h */ from_promisor : 1, refetch : 1, atomic : 1, object_format : 1, force_if_includes : 1; const struct git_hash_algo *hash_algo; }; static struct options options; static struct string_list cas_options = STRING_LIST_INIT_DUP; static int set_option(const char *name, const char *value) { if (!strcmp(name, "verbosity")) { char *end; int v = strtol(value, &end, 10); if (value == end || *end) return -1; options.verbosity = v; return 0; } else if (!strcmp(name, "progress")) { if (!strcmp(value, "true")) options.progress = 1; else if (!strcmp(value, "false")) options.progress = 0; else return -1; return 0; } else if (!strcmp(name, "depth")) { char *end; unsigned long v = strtoul(value, &end, 10); if (value == end || *end) return -1; options.depth = v; return 0; } else if (!strcmp(name, "deepen-since")) { options.deepen_since = xstrdup(value); return 0; } else if (!strcmp(name, "deepen-not")) { string_list_append(&options.deepen_not, value); return 0; } else if (!strcmp(name, "deepen-relative")) { if (!strcmp(value, "true")) options.deepen_relative = 1; else if (!strcmp(value, "false")) options.deepen_relative = 0; else return -1; return 0; } else if (!strcmp(name, "followtags")) { if (!strcmp(value, "true")) options.followtags = 1; else if (!strcmp(value, "false")) options.followtags = 0; else return -1; return 0; } else if (!strcmp(name, "dry-run")) { if (!strcmp(value, "true")) options.dry_run = 1; else if (!strcmp(value, "false")) options.dry_run = 0; else return -1; return 0; } else if (!strcmp(name, "check-connectivity")) { if (!strcmp(value, "true")) options.check_self_contained_and_connected = 1; else if (!strcmp(value, "false")) options.check_self_contained_and_connected = 0; else return -1; return 0; } else if (!strcmp(name, "cas")) { struct strbuf val = STRBUF_INIT; strbuf_addstr(&val, "--force-with-lease="); if (*value != '"') strbuf_addstr(&val, value); else if (unquote_c_style(&val, value, NULL)) return -1; string_list_append(&cas_options, val.buf); strbuf_release(&val); return 0; } else if (!strcmp(name, TRANS_OPT_FORCE_IF_INCLUDES)) { if (!strcmp(value, "true")) options.force_if_includes = 1; else if (!strcmp(value, "false")) options.force_if_includes = 0; else return -1; return 0; } else if (!strcmp(name, "cloning")) { if (!strcmp(value, "true")) options.cloning = 1; else if (!strcmp(value, "false")) options.cloning = 0; else return -1; return 0; } else if (!strcmp(name, "update-shallow")) { if (!strcmp(value, "true")) options.update_shallow = 1; else if (!strcmp(value, "false")) options.update_shallow = 0; else return -1; return 0; } else if (!strcmp(name, "pushcert")) { if (!strcmp(value, "true")) options.push_cert = SEND_PACK_PUSH_CERT_ALWAYS; else if (!strcmp(value, "false")) options.push_cert = SEND_PACK_PUSH_CERT_NEVER; else if (!strcmp(value, "if-asked")) options.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED; else return -1; return 0; } else if (!strcmp(name, "atomic")) { if (!strcmp(value, "true")) options.atomic = 1; else if (!strcmp(value, "false")) options.atomic = 0; else return -1; return 0; } else if (!strcmp(name, "push-option")) { if (*value != '"') string_list_append(&options.push_options, value); else { struct strbuf unquoted = STRBUF_INIT; if (unquote_c_style(&unquoted, value, NULL) < 0) die(_("invalid quoting in push-option value: '%s'"), value); string_list_append_nodup(&options.push_options, strbuf_detach(&unquoted, NULL)); } return 0; } else if (!strcmp(name, "family")) { if (!strcmp(value, "ipv4")) git_curl_ipresolve = CURL_IPRESOLVE_V4; else if (!strcmp(value, "ipv6")) git_curl_ipresolve = CURL_IPRESOLVE_V6; else if (!strcmp(value, "all")) git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER; else return -1; return 0; } else if (!strcmp(name, "from-promisor")) { options.from_promisor = 1; return 0; } else if (!strcmp(name, "refetch")) { options.refetch = 1; return 0; } else if (!strcmp(name, "filter")) { options.filter = xstrdup(value); return 0; } else if (!strcmp(name, "object-format")) { int algo; options.object_format = 1; if (strcmp(value, "true")) { algo = hash_algo_by_name(value); if (algo == GIT_HASH_UNKNOWN) die("unknown object format '%s'", value); options.hash_algo = &hash_algos[algo]; } return 0; } else { return 1 /* unsupported */; } } struct discovery { char *service; char *buf_alloc; char *buf; size_t len; struct ref *refs; struct oid_array shallow; enum protocol_version version; unsigned proto_git : 1; }; static struct discovery *last_discovery; static struct ref *parse_git_refs(struct discovery *heads, int for_push) { struct ref *list = NULL; struct packet_reader reader; packet_reader_init(&reader, -1, heads->buf, heads->len, PACKET_READ_CHOMP_NEWLINE | PACKET_READ_GENTLE_ON_EOF | PACKET_READ_DIE_ON_ERR_PACKET); heads->version = discover_version(&reader); switch (heads->version) { case protocol_v2: /* * Do nothing. This isn't a list of refs but rather a * capability advertisement. Client would have run * 'stateless-connect' so we'll dump this capability listing * and let them request the refs themselves. */ break; case protocol_v1: case protocol_v0: get_remote_heads(&reader, &list, for_push ? REF_NORMAL : 0, NULL, &heads->shallow); options.hash_algo = reader.hash_algo; break; case protocol_unknown_version: BUG("unknown protocol version"); } return list; } static const struct git_hash_algo *detect_hash_algo(struct discovery *heads) { const char *p = memchr(heads->buf, '\t', heads->len); int algo; if (!p) return the_hash_algo; algo = hash_algo_by_length((p - heads->buf) / 2); if (algo == GIT_HASH_UNKNOWN) return NULL; return &hash_algos[algo]; } static struct ref *parse_info_refs(struct discovery *heads) { char *data, *start, *mid; char *ref_name; int i = 0; struct ref *refs = NULL; struct ref *ref = NULL; struct ref *last_ref = NULL; options.hash_algo = detect_hash_algo(heads); if (!options.hash_algo) die("%sinfo/refs not valid: could not determine hash algorithm; " "is this a git repository?", transport_anonymize_url(url.buf)); data = heads->buf; start = NULL; mid = data; while (i < heads->len) { if (!start) { start = &data[i]; } if (data[i] == '\t') mid = &data[i]; if (data[i] == '\n') { if (mid - start != options.hash_algo->hexsz) die(_("%sinfo/refs not valid: is this a git repository?"), transport_anonymize_url(url.buf)); data[i] = 0; ref_name = mid + 1; ref = alloc_ref(ref_name); get_oid_hex_algop(start, &ref->old_oid, options.hash_algo); if (!refs) refs = ref; if (last_ref) last_ref->next = ref; last_ref = ref; start = NULL; } i++; } ref = alloc_ref("HEAD"); if (!http_fetch_ref(url.buf, ref) && !resolve_remote_symref(ref, refs)) { ref->next = refs; refs = ref; } else { free(ref); } return refs; } static void free_discovery(struct discovery *d) { if (d) { if (d == last_discovery) last_discovery = NULL; free(d->shallow.oid); free(d->buf_alloc); free_refs(d->refs); free(d->service); free(d); } } static int show_http_message(struct strbuf *type, struct strbuf *charset, struct strbuf *msg) { const char *p, *eol; /* * We only show text/plain parts, as other types are likely * to be ugly to look at on the user's terminal. */ if (strcmp(type->buf, "text/plain")) return -1; if (charset->len) strbuf_reencode(msg, charset->buf, get_log_output_encoding()); strbuf_trim(msg); if (!msg->len) return -1; p = msg->buf; do { eol = strchrnul(p, '\n'); fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p); p = eol + 1; } while(*eol); return 0; } static int get_protocol_http_header(enum protocol_version version, struct strbuf *header) { if (version > 0) { strbuf_addf(header, GIT_PROTOCOL_HEADER ": version=%d", version); return 1; } return 0; } static void check_smart_http(struct discovery *d, const char *service, struct strbuf *type) { const char *p; struct packet_reader reader; /* * If we don't see x-$service-advertisement, then it's not smart-http. * But once we do, we commit to it and assume any other protocol * violations are hard errors. */ if (!skip_prefix(type->buf, "application/x-", &p) || !skip_prefix(p, service, &p) || strcmp(p, "-advertisement")) return; packet_reader_init(&reader, -1, d->buf, d->len, PACKET_READ_CHOMP_NEWLINE | PACKET_READ_DIE_ON_ERR_PACKET); if (packet_reader_read(&reader) != PACKET_READ_NORMAL) die(_("invalid server response; expected service, got flush packet")); if (skip_prefix(reader.line, "# service=", &p) && !strcmp(p, service)) { /* * The header can include additional metadata lines, up * until a packet flush marker. Ignore these now, but * in the future we might start to scan them. */ for (;;) { packet_reader_read(&reader); if (reader.pktlen <= 0) { break; } } /* * v0 smart http; callers expect us to soak up the * service and header packets */ d->buf = reader.src_buffer; d->len = reader.src_len; d->proto_git = 1; } else if (!strcmp(reader.line, "version 2")) { /* * v2 smart http; do not consume version packet, which will * be handled elsewhere. */ d->proto_git = 1; } else { die(_("invalid server response; got '%s'"), reader.line); } } static struct discovery *discover_refs(const char *service, int for_push) { struct strbuf type = STRBUF_INIT; struct strbuf charset = STRBUF_INIT; struct strbuf buffer = STRBUF_INIT; struct strbuf refs_url = STRBUF_INIT; struct strbuf effective_url = STRBUF_INIT; struct strbuf protocol_header = STRBUF_INIT; struct string_list extra_headers = STRING_LIST_INIT_DUP; struct discovery *last = last_discovery; int http_ret, maybe_smart = 0; struct http_get_options http_options; enum protocol_version version = get_protocol_version_config(); if (last && !strcmp(service, last->service)) return last; free_discovery(last); strbuf_addf(&refs_url, "%sinfo/refs", url.buf); if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) && git_env_bool("GIT_SMART_HTTP", 1)) { maybe_smart = 1; if (!strchr(url.buf, '?')) strbuf_addch(&refs_url, '?'); else strbuf_addch(&refs_url, '&'); strbuf_addf(&refs_url, "service=%s", service); } /* * NEEDSWORK: If we are trying to use protocol v2 and we are planning * to perform any operation that doesn't involve upload-pack (i.e., a * fetch, ls-remote, etc), then fallback to v0 since we don't know how * to do anything else (like push or remote archive) via v2. */ if (version == protocol_v2 && strcmp("git-upload-pack", service)) version = protocol_v0; /* Add the extra Git-Protocol header */ if (get_protocol_http_header(version, &protocol_header)) string_list_append(&extra_headers, protocol_header.buf); memset(&http_options, 0, sizeof(http_options)); http_options.content_type = &type; http_options.charset = &charset; http_options.effective_url = &effective_url; http_options.base_url = &url; http_options.extra_headers = &extra_headers; http_options.initial_request = 1; http_options.no_cache = 1; http_ret = http_get_strbuf(refs_url.buf, &buffer, &http_options); switch (http_ret) { case HTTP_OK: break; case HTTP_MISSING_TARGET: show_http_message(&type, &charset, &buffer); die(_("repository '%s' not found"), transport_anonymize_url(url.buf)); case HTTP_NOAUTH: show_http_message(&type, &charset, &buffer); die(_("Authentication failed for '%s'"), transport_anonymize_url(url.buf)); case HTTP_NOMATCHPUBLICKEY: show_http_message(&type, &charset, &buffer); die(_("unable to access '%s' with http.pinnedPubkey configuration: %s"), transport_anonymize_url(url.buf), curl_errorstr); default: show_http_message(&type, &charset, &buffer); die(_("unable to access '%s': %s"), transport_anonymize_url(url.buf), curl_errorstr); } if (options.verbosity && !starts_with(refs_url.buf, url.buf)) { char *u = transport_anonymize_url(url.buf); warning(_("redirecting to %s"), u); free(u); } last= xcalloc(1, sizeof(*last_discovery)); last->service = xstrdup(service); last->buf_alloc = strbuf_detach(&buffer, &last->len); last->buf = last->buf_alloc; if (maybe_smart) check_smart_http(last, service, &type); if (last->proto_git) last->refs = parse_git_refs(last, for_push); else last->refs = parse_info_refs(last); strbuf_release(&refs_url); strbuf_release(&type); strbuf_release(&charset); strbuf_release(&effective_url); strbuf_release(&buffer); strbuf_release(&protocol_header); string_list_clear(&extra_headers, 0); last_discovery = last; return last; } static struct ref *get_refs(int for_push) { struct discovery *heads; if (for_push) heads = discover_refs("git-receive-pack", for_push); else heads = discover_refs("git-upload-pack", for_push); return heads->refs; } static void output_refs(struct ref *refs) { struct ref *posn; if (options.object_format && options.hash_algo) { printf(":object-format %s\n", options.hash_algo->name); repo_set_hash_algo(the_repository, hash_algo_by_ptr(options.hash_algo)); } for (posn = refs; posn; posn = posn->next) { if (posn->symref) printf("@%s %s\n", posn->symref, posn->name); else printf("%s %s\n", hash_to_hex_algop(posn->old_oid.hash, options.hash_algo), posn->name); } printf("\n"); fflush(stdout); } struct rpc_state { const char *service_name; char *service_url; char *hdr_content_type; char *hdr_accept; char *hdr_accept_language; char *protocol_header; char *buf; size_t alloc; size_t len; size_t pos; int in; int out; int any_written; unsigned gzip_request : 1; unsigned initial_buffer : 1; /* * Whenever a pkt-line is read into buf, append the 4 characters * denoting its length before appending the payload. */ unsigned write_line_lengths : 1; /* * Used by rpc_out; initialize to 0. This is true if a flush has been * read, but the corresponding line length (if write_line_lengths is * true) and EOF have not been sent to libcurl. Since each flush marks * the end of a request, each flush must be completely sent before any * further reading occurs. */ unsigned flush_read_but_not_sent : 1; }; #define RPC_STATE_INIT { 0 } /* * Appends the result of reading from rpc->out to the string represented by * rpc->buf and rpc->len if there is enough space. Returns 1 if there was * enough space, 0 otherwise. * * If rpc->write_line_lengths is true, appends the line length as a 4-byte * hexadecimal string before appending the result described above. * * Writes the total number of bytes appended into appended. */ static int rpc_read_from_out(struct rpc_state *rpc, int options, size_t *appended, enum packet_read_status *status) { size_t left; char *buf; int pktlen_raw; if (rpc->write_line_lengths) { left = rpc->alloc - rpc->len - 4; buf = rpc->buf + rpc->len + 4; } else { left = rpc->alloc - rpc->len; buf = rpc->buf + rpc->len; } if (left < LARGE_PACKET_MAX) return 0; *status = packet_read_with_status(rpc->out, NULL, NULL, buf, left, &pktlen_raw, options); if (*status != PACKET_READ_EOF) { *appended = pktlen_raw + (rpc->write_line_lengths ? 4 : 0); rpc->len += *appended; } if (rpc->write_line_lengths) { switch (*status) { case PACKET_READ_EOF: if (!(options & PACKET_READ_GENTLE_ON_EOF)) die(_("shouldn't have EOF when not gentle on EOF")); break; case PACKET_READ_NORMAL: set_packet_header(buf - 4, *appended); break; case PACKET_READ_DELIM: memcpy(buf - 4, "0001", 4); break; case PACKET_READ_FLUSH: memcpy(buf - 4, "0000", 4); break; case PACKET_READ_RESPONSE_END: die(_("remote server sent unexpected response end packet")); } } return 1; } static size_t rpc_out(void *ptr, size_t eltsize, size_t nmemb, void *buffer_) { size_t max = eltsize * nmemb; struct rpc_state *rpc = buffer_; size_t avail = rpc->len - rpc->pos; enum packet_read_status status; if (!avail) { rpc->initial_buffer = 0; rpc->len = 0; rpc->pos = 0; if (!rpc->flush_read_but_not_sent) { if (!rpc_read_from_out(rpc, 0, &avail, &status)) BUG("The entire rpc->buf should be larger than LARGE_PACKET_MAX"); if (status == PACKET_READ_FLUSH) rpc->flush_read_but_not_sent = 1; } /* * If flush_read_but_not_sent is true, we have already read one * full request but have not fully sent it + EOF, which is why * we need to refrain from reading. */ } if (rpc->flush_read_but_not_sent) { if (!avail) { /* * The line length either does not need to be sent at * all or has already been completely sent. Now we can * return 0, indicating EOF, meaning that the flush has * been fully sent. */ rpc->flush_read_but_not_sent = 0; return 0; } /* * If avail is non-zero, the line length for the flush still * hasn't been fully sent. Proceed with sending the line * length. */ } if (max < avail) avail = max; memcpy(ptr, rpc->buf + rpc->pos, avail); rpc->pos += avail; return avail; } static int rpc_seek(void *clientp, curl_off_t offset, int origin) { struct rpc_state *rpc = clientp; if (origin != SEEK_SET) BUG("rpc_seek only handles SEEK_SET, not %d", origin); if (rpc->initial_buffer) { if (offset < 0 || offset > rpc->len) { error("curl seek would be outside of rpc buffer"); return CURL_SEEKFUNC_FAIL; } rpc->pos = offset; return CURL_SEEKFUNC_OK; } error(_("unable to rewind rpc post data - try increasing http.postBuffer")); return CURL_SEEKFUNC_FAIL; } struct check_pktline_state { char len_buf[4]; int len_filled; int remaining; }; static void check_pktline(struct check_pktline_state *state, const char *ptr, size_t size) { while (size) { if (!state->remaining) { int digits_remaining = 4 - state->len_filled; if (digits_remaining > size) digits_remaining = size; memcpy(&state->len_buf[state->len_filled], ptr, digits_remaining); state->len_filled += digits_remaining; ptr += digits_remaining; size -= digits_remaining; if (state->len_filled == 4) { state->remaining = packet_length(state->len_buf); if (state->remaining < 0) { die(_("remote-curl: bad line length character: %.4s"), state->len_buf); } else if (state->remaining == 2) { die(_("remote-curl: unexpected response end packet")); } else if (state->remaining < 4) { state->remaining = 0; } else { state->remaining -= 4; } state->len_filled = 0; } } if (state->remaining) { int remaining = state->remaining; if (remaining > size) remaining = size; ptr += remaining; size -= remaining; state->remaining -= remaining; } } } struct rpc_in_data { struct rpc_state *rpc; struct active_request_slot *slot; int check_pktline; struct check_pktline_state pktline_state; }; /* * A callback for CURLOPT_WRITEFUNCTION. The return value is the bytes consumed * from ptr. */ static size_t rpc_in(char *ptr, size_t eltsize, size_t nmemb, void *buffer_) { size_t size = eltsize * nmemb; struct rpc_in_data *data = buffer_; long response_code; if (curl_easy_getinfo(data->slot->curl, CURLINFO_RESPONSE_CODE, &response_code) != CURLE_OK) return size; if (response_code >= 300) return size; if (size) data->rpc->any_written = 1; if (data->check_pktline) check_pktline(&data->pktline_state, ptr, size); write_or_die(data->rpc->in, ptr, size); return size; } static int run_slot(struct active_request_slot *slot, struct slot_results *results) { int err; struct slot_results results_buf; if (!results) results = &results_buf; err = run_one_slot(slot, results); if (err != HTTP_OK && err != HTTP_REAUTH) { struct strbuf msg = STRBUF_INIT; if (results->http_code && results->http_code != 200) strbuf_addf(&msg, "HTTP %ld", results->http_code); if (results->curl_result != CURLE_OK) { if (msg.len) strbuf_addch(&msg, ' '); strbuf_addf(&msg, "curl %d", results->curl_result); if (curl_errorstr[0]) { strbuf_addch(&msg, ' '); strbuf_addstr(&msg, curl_errorstr); } } error(_("RPC failed; %s"), msg.buf); strbuf_release(&msg); } return err; } static int probe_rpc(struct rpc_state *rpc, struct slot_results *results) { struct active_request_slot *slot; struct curl_slist *headers = http_copy_default_headers(); struct strbuf buf = STRBUF_INIT; int err; slot = get_active_slot(); headers = curl_slist_append(headers, rpc->hdr_content_type); headers = curl_slist_append(headers, rpc->hdr_accept); curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0); curl_easy_setopt(slot->curl, CURLOPT_POST, 1); curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url); curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL); curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000"); curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4); curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers); curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer); curl_easy_setopt(slot->curl, CURLOPT_WRITEDATA, &buf); err = run_slot(slot, results); curl_slist_free_all(headers); strbuf_release(&buf); return err; } static curl_off_t xcurl_off_t(size_t len) { uintmax_t size = len; if (size > maximum_signed_value_of_type(curl_off_t)) die(_("cannot handle pushes this big")); return (curl_off_t)size; } /* * If flush_received is true, do not attempt to read any more; just use what's * in rpc->buf. */ static int post_rpc(struct rpc_state *rpc, int stateless_connect, int flush_received) { struct active_request_slot *slot; struct curl_slist *headers = http_copy_default_headers(); int use_gzip = rpc->gzip_request; char *gzip_body = NULL; size_t gzip_size = 0; int err, large_request = 0; int needs_100_continue = 0; struct rpc_in_data rpc_in_data; /* Try to load the entire request, if we can fit it into the * allocated buffer space we can use HTTP/1.0 and avoid the * chunked encoding mess. */ if (!flush_received) { while (1) { size_t n; enum packet_read_status status; if (!rpc_read_from_out(rpc, 0, &n, &status)) { large_request = 1; use_gzip = 0; break; } if (status == PACKET_READ_FLUSH) break; } } if (large_request) { struct slot_results results; do { err = probe_rpc(rpc, &results); if (err == HTTP_REAUTH) credential_fill(&http_auth); } while (err == HTTP_REAUTH); if (err != HTTP_OK) return -1; if (results.auth_avail & CURLAUTH_GSSNEGOTIATE) needs_100_continue = 1; } headers = curl_slist_append(headers, rpc->hdr_content_type); headers = curl_slist_append(headers, rpc->hdr_accept); headers = curl_slist_append(headers, needs_100_continue ? "Expect: 100-continue" : "Expect:"); /* Add Accept-Language header */ if (rpc->hdr_accept_language) headers = curl_slist_append(headers, rpc->hdr_accept_language); /* Add the extra Git-Protocol header */ if (rpc->protocol_header) headers = curl_slist_append(headers, rpc->protocol_header); retry: slot = get_active_slot(); curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0); curl_easy_setopt(slot->curl, CURLOPT_POST, 1); curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url); curl_easy_setopt(slot->curl, CURLOPT_ENCODING, ""); if (large_request) { /* The request body is large and the size cannot be predicted. * We must use chunked encoding to send it. */ headers = curl_slist_append(headers, "Transfer-Encoding: chunked"); rpc->initial_buffer = 1; curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out); curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc); curl_easy_setopt(slot->curl, CURLOPT_SEEKFUNCTION, rpc_seek); curl_easy_setopt(slot->curl, CURLOPT_SEEKDATA, rpc); if (options.verbosity > 1) { fprintf(stderr, "POST %s (chunked)\n", rpc->service_name); fflush(stderr); } } else if (gzip_body) { /* * If we are looping to retry authentication, then the previous * run will have set up the headers and gzip buffer already, * and we just need to send it. */ curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body); curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size)); } else if (use_gzip && 1024 < rpc->len) { /* The client backend isn't giving us compressed data so * we can try to deflate it ourselves, this may save on * the transfer time. */ git_zstream stream; int ret; git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION); gzip_size = git_deflate_bound(&stream, rpc->len); gzip_body = xmalloc(gzip_size); stream.next_in = (unsigned char *)rpc->buf; stream.avail_in = rpc->len; stream.next_out = (unsigned char *)gzip_body; stream.avail_out = gzip_size; ret = git_deflate(&stream, Z_FINISH); if (ret != Z_STREAM_END) die(_("cannot deflate request; zlib deflate error %d"), ret); ret = git_deflate_end_gently(&stream); if (ret != Z_OK) die(_("cannot deflate request; zlib end error %d"), ret); gzip_size = stream.total_out; headers = curl_slist_append(headers, "Content-Encoding: gzip"); curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body); curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size)); if (options.verbosity > 1) { fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n", rpc->service_name, (unsigned long)rpc->len, (unsigned long)gzip_size); fflush(stderr); } } else { /* We know the complete request size in advance, use the * more normal Content-Length approach. */ curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf); curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(rpc->len)); if (options.verbosity > 1) { fprintf(stderr, "POST %s (%lu bytes)\n", rpc->service_name, (unsigned long)rpc->len); fflush(stderr); } } curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers); curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in); rpc_in_data.rpc = rpc; rpc_in_data.slot = slot; rpc_in_data.check_pktline = stateless_connect; memset(&rpc_in_data.pktline_state, 0, sizeof(rpc_in_data.pktline_state)); curl_easy_setopt(slot->curl, CURLOPT_WRITEDATA, &rpc_in_data); curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0); rpc->any_written = 0; err = run_slot(slot, NULL); if (err == HTTP_REAUTH && !large_request) { credential_fill(&http_auth); goto retry; } if (err != HTTP_OK) err = -1; if (!rpc->any_written) err = -1; if (rpc_in_data.pktline_state.len_filled) err = error(_("%d bytes of length header were received"), rpc_in_data.pktline_state.len_filled); if (rpc_in_data.pktline_state.remaining) err = error(_("%d bytes of body are still expected"), rpc_in_data.pktline_state.remaining); if (stateless_connect) packet_response_end(rpc->in); curl_slist_free_all(headers); free(gzip_body); return err; } static int rpc_service(struct rpc_state *rpc, struct discovery *heads, const char **client_argv, const struct strbuf *preamble, struct strbuf *rpc_result) { const char *svc = rpc->service_name; struct strbuf buf = STRBUF_INIT; struct child_process client = CHILD_PROCESS_INIT; int err = 0; client.in = -1; client.out = -1; client.git_cmd = 1; strvec_pushv(&client.args, client_argv); if (start_command(&client)) exit(1); write_or_die(client.in, preamble->buf, preamble->len); if (heads) write_or_die(client.in, heads->buf, heads->len); rpc->alloc = http_post_buffer; rpc->buf = xmalloc(rpc->alloc); rpc->in = client.in; rpc->out = client.out; strbuf_addf(&buf, "%s%s", url.buf, svc); rpc->service_url = strbuf_detach(&buf, NULL); rpc->hdr_accept_language = xstrdup_or_null(http_get_accept_language_header()); strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc); rpc->hdr_content_type = strbuf_detach(&buf, NULL); strbuf_addf(&buf, "Accept: application/x-%s-result", svc); rpc->hdr_accept = strbuf_detach(&buf, NULL); if (get_protocol_http_header(heads->version, &buf)) rpc->protocol_header = strbuf_detach(&buf, NULL); else rpc->protocol_header = NULL; while (!err) { int n = packet_read(rpc->out, rpc->buf, rpc->alloc, 0); if (!n) break; rpc->pos = 0; rpc->len = n; err |= post_rpc(rpc, 0, 0); } close(client.in); client.in = -1; if (!err) { strbuf_read(rpc_result, client.out, 0); } else { char buf[4096]; for (;;) if (xread(client.out, buf, sizeof(buf)) <= 0) break; } close(client.out); client.out = -1; err |= finish_command(&client); free(rpc->service_url); free(rpc->hdr_content_type); free(rpc->hdr_accept); free(rpc->hdr_accept_language); free(rpc->protocol_header); free(rpc->buf); strbuf_release(&buf); return err; } static int fetch_dumb(int nr_heads, struct ref **to_fetch) { struct walker *walker; char **targets; int ret, i; ALLOC_ARRAY(targets, nr_heads); if (options.depth || options.deepen_since) die(_("dumb http transport does not support shallow capabilities")); for (i = 0; i < nr_heads; i++) targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid)); walker = get_http_walker(url.buf); walker->get_verbosely = options.verbosity >= 3; walker->get_progress = options.progress; walker->get_recover = 0; ret = walker_fetch(walker, nr_heads, targets, NULL, NULL); walker_free(walker); for (i = 0; i < nr_heads; i++) free(targets[i]); free(targets); return ret ? error(_("fetch failed.")) : 0; } static int fetch_git(struct discovery *heads, int nr_heads, struct ref **to_fetch) { struct rpc_state rpc = RPC_STATE_INIT; struct strbuf preamble = STRBUF_INIT; int i, err; struct strvec args = STRVEC_INIT; struct strbuf rpc_result = STRBUF_INIT; strvec_pushl(&args, "fetch-pack", "--stateless-rpc", "--stdin", "--lock-pack", NULL); if (options.followtags) strvec_push(&args, "--include-tag"); if (options.thin) strvec_push(&args, "--thin"); if (options.verbosity >= 3) strvec_pushl(&args, "-v", "-v", NULL); if (options.check_self_contained_and_connected) strvec_push(&args, "--check-self-contained-and-connected"); if (options.cloning) strvec_push(&args, "--cloning"); if (options.update_shallow) strvec_push(&args, "--update-shallow"); if (!options.progress) strvec_push(&args, "--no-progress"); if (options.depth) strvec_pushf(&args, "--depth=%lu", options.depth); if (options.deepen_since) strvec_pushf(&args, "--shallow-since=%s", options.deepen_since); for (i = 0; i < options.deepen_not.nr; i++) strvec_pushf(&args, "--shallow-exclude=%s", options.deepen_not.items[i].string); if (options.deepen_relative && options.depth) strvec_push(&args, "--deepen-relative"); if (options.from_promisor) strvec_push(&args, "--from-promisor"); if (options.refetch) strvec_push(&args, "--refetch"); if (options.filter) strvec_pushf(&args, "--filter=%s", options.filter); strvec_push(&args, url.buf); for (i = 0; i < nr_heads; i++) { struct ref *ref = to_fetch[i]; if (!*ref->name) die(_("cannot fetch by sha1 over smart http")); packet_buf_write(&preamble, "%s %s\n", oid_to_hex(&ref->old_oid), ref->name); } packet_buf_flush(&preamble); memset(&rpc, 0, sizeof(rpc)); rpc.service_name = "git-upload-pack", rpc.gzip_request = 1; err = rpc_service(&rpc, heads, args.v, &preamble, &rpc_result); if (rpc_result.len) write_or_die(1, rpc_result.buf, rpc_result.len); strbuf_release(&rpc_result); strbuf_release(&preamble); strvec_clear(&args); return err; } static int fetch(int nr_heads, struct ref **to_fetch) { struct discovery *d = discover_refs("git-upload-pack", 0); if (d->proto_git) return fetch_git(d, nr_heads, to_fetch); else return fetch_dumb(nr_heads, to_fetch); } static void parse_fetch(struct strbuf *buf) { struct ref **to_fetch = NULL; struct ref *list_head = NULL; struct ref **list = &list_head; int alloc_heads = 0, nr_heads = 0; do { const char *p; if (skip_prefix(buf->buf, "fetch ", &p)) { const char *name; struct ref *ref; struct object_id old_oid; const char *q; if (parse_oid_hex(p, &old_oid, &q)) die(_("protocol error: expected sha/ref, got '%s'"), p); if (*q == ' ') name = q + 1; else if (!*q) name = ""; else die(_("protocol error: expected sha/ref, got '%s'"), p); ref = alloc_ref(name); oidcpy(&ref->old_oid, &old_oid); *list = ref; list = &ref->next; ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads); to_fetch[nr_heads++] = ref; } else die(_("http transport does not support %s"), buf->buf); strbuf_reset(buf); if (strbuf_getline_lf(buf, stdin) == EOF) return; if (!*buf->buf) break; } while (1); if (fetch(nr_heads, to_fetch)) exit(128); /* error already reported */ free_refs(list_head); free(to_fetch); printf("\n"); fflush(stdout); strbuf_reset(buf); } static void parse_get(const char *arg) { struct strbuf url = STRBUF_INIT; struct strbuf path = STRBUF_INIT; const char *space; space = strchr(arg, ' '); if (!space) die(_("protocol error: expected '<url> <path>', missing space")); strbuf_add(&url, arg, space - arg); strbuf_addstr(&path, space + 1); if (http_get_file(url.buf, path.buf, NULL)) die(_("failed to download file at URL '%s'"), url.buf); strbuf_release(&url); strbuf_release(&path); printf("\n"); fflush(stdout); } static int push_dav(int nr_spec, const char **specs) { struct child_process child = CHILD_PROCESS_INIT; size_t i; child.git_cmd = 1; strvec_push(&child.args, "http-push"); strvec_push(&child.args, "--helper-status"); if (options.dry_run) strvec_push(&child.args, "--dry-run"); if (options.verbosity > 1) strvec_push(&child.args, "--verbose"); strvec_push(&child.args, url.buf); for (i = 0; i < nr_spec; i++) strvec_push(&child.args, specs[i]); if (run_command(&child)) die(_("git-http-push failed")); return 0; } static int push_git(struct discovery *heads, int nr_spec, const char **specs) { struct rpc_state rpc = RPC_STATE_INIT; int i, err; struct strvec args; struct string_list_item *cas_option; struct strbuf preamble = STRBUF_INIT; struct strbuf rpc_result = STRBUF_INIT; strvec_init(&args); strvec_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status", NULL); if (options.thin) strvec_push(&args, "--thin"); if (options.dry_run) strvec_push(&args, "--dry-run"); if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS) strvec_push(&args, "--signed=yes"); else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED) strvec_push(&args, "--signed=if-asked"); if (options.atomic) strvec_push(&args, "--atomic"); if (options.verbosity == 0) strvec_push(&args, "--quiet"); else if (options.verbosity > 1) strvec_push(&args, "--verbose"); for (i = 0; i < options.push_options.nr; i++) strvec_pushf(&args, "--push-option=%s", options.push_options.items[i].string); strvec_push(&args, options.progress ? "--progress" : "--no-progress"); for_each_string_list_item(cas_option, &cas_options) strvec_push(&args, cas_option->string); strvec_push(&args, url.buf); if (options.force_if_includes) strvec_push(&args, "--force-if-includes"); strvec_push(&args, "--stdin"); for (i = 0; i < nr_spec; i++) packet_buf_write(&preamble, "%s\n", specs[i]); packet_buf_flush(&preamble); memset(&rpc, 0, sizeof(rpc)); rpc.service_name = "git-receive-pack", err = rpc_service(&rpc, heads, args.v, &preamble, &rpc_result); if (rpc_result.len) write_or_die(1, rpc_result.buf, rpc_result.len); strbuf_release(&rpc_result); strbuf_release(&preamble); strvec_clear(&args); return err; } static int push(int nr_spec, const char **specs) { struct discovery *heads = discover_refs("git-receive-pack", 1); int ret; if (heads->proto_git) ret = push_git(heads, nr_spec, specs); else ret = push_dav(nr_spec, specs); free_discovery(heads); return ret; } static void parse_push(struct strbuf *buf) { struct strvec specs = STRVEC_INIT; int ret; do { const char *arg; if (skip_prefix(buf->buf, "push ", &arg)) strvec_push(&specs, arg); else die(_("http transport does not support %s"), buf->buf); strbuf_reset(buf); if (strbuf_getline_lf(buf, stdin) == EOF) goto free_specs; if (!*buf->buf) break; } while (1); ret = push(specs.nr, specs.v); printf("\n"); fflush(stdout); if (ret) exit(128); /* error already reported */ free_specs: strvec_clear(&specs); } static int stateless_connect(const char *service_name) { struct discovery *discover; struct rpc_state rpc = RPC_STATE_INIT; struct strbuf buf = STRBUF_INIT; const char *accept_language; /* * Run the info/refs request and see if the server supports protocol * v2. If and only if the server supports v2 can we successfully * establish a stateless connection, otherwise we need to tell the * client to fallback to using other transport helper functions to * complete their request. */ discover = discover_refs(service_name, 0); if (discover->version != protocol_v2) { printf("fallback\n"); fflush(stdout); return -1; } else { /* Stateless Connection established */ printf("\n"); fflush(stdout); } accept_language = http_get_accept_language_header(); if (accept_language) rpc.hdr_accept_language = xstrfmt("%s", accept_language); rpc.service_name = service_name; rpc.service_url = xstrfmt("%s%s", url.buf, rpc.service_name); rpc.hdr_content_type = xstrfmt("Content-Type: application/x-%s-request", rpc.service_name); rpc.hdr_accept = xstrfmt("Accept: application/x-%s-result", rpc.service_name); if (get_protocol_http_header(discover->version, &buf)) { rpc.protocol_header = strbuf_detach(&buf, NULL); } else { rpc.protocol_header = NULL; strbuf_release(&buf); } rpc.buf = xmalloc(http_post_buffer); rpc.alloc = http_post_buffer; rpc.len = 0; rpc.pos = 0; rpc.in = 1; rpc.out = 0; rpc.any_written = 0; rpc.gzip_request = 1; rpc.initial_buffer = 0; rpc.write_line_lengths = 1; rpc.flush_read_but_not_sent = 0; /* * Dump the capability listing that we got from the server earlier * during the info/refs request. */ write_or_die(rpc.in, discover->buf, discover->len); /* Until we see EOF keep sending POSTs */ while (1) { size_t avail; enum packet_read_status status; if (!rpc_read_from_out(&rpc, PACKET_READ_GENTLE_ON_EOF, &avail, &status)) BUG("The entire rpc->buf should be larger than LARGE_PACKET_MAX"); if (status == PACKET_READ_EOF) break; if (post_rpc(&rpc, 1, status == PACKET_READ_FLUSH)) /* We would have an err here */ break; /* Reset the buffer for next request */ rpc.len = 0; } free(rpc.service_url); free(rpc.hdr_content_type); free(rpc.hdr_accept); free(rpc.hdr_accept_language); free(rpc.protocol_header); free(rpc.buf); strbuf_release(&buf); return 0; } int cmd_main(int argc, const char **argv) { struct strbuf buf = STRBUF_INIT; int nongit; int ret = 1; setup_git_directory_gently(&nongit); if (argc < 2) { error(_("remote-curl: usage: git remote-curl <remote> [<url>]")); goto cleanup; } options.verbosity = 1; options.progress = !!isatty(2); options.thin = 1; string_list_init_dup(&options.deepen_not); string_list_init_dup(&options.push_options); /* * Just report "remote-curl" here (folding all the various aliases * ("git-remote-http", "git-remote-https", and etc.) here since they * are all just copies of the same actual executable. */ trace2_cmd_name("remote-curl"); remote = remote_get(argv[1]); if (argc > 2) { end_url_with_slash(&url, argv[2]); } else { end_url_with_slash(&url, remote->url[0]); } http_init(remote, url.buf, 0); do { const char *arg; if (strbuf_getline_lf(&buf, stdin) == EOF) { if (ferror(stdin)) error(_("remote-curl: error reading command stream from git")); goto cleanup; } if (buf.len == 0) break; if (starts_with(buf.buf, "fetch ")) { if (nongit) die(_("remote-curl: fetch attempted without a local repo")); parse_fetch(&buf); } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) { int for_push = !!strstr(buf.buf + 4, "for-push"); output_refs(get_refs(for_push)); } else if (starts_with(buf.buf, "push ")) { parse_push(&buf); } else if (skip_prefix(buf.buf, "option ", &arg)) { char *value = strchr(arg, ' '); int result; if (value) *value++ = '\0'; else value = "true"; result = set_option(arg, value); if (!result) printf("ok\n"); else if (result < 0) printf("error invalid value\n"); else printf("unsupported\n"); fflush(stdout); } else if (skip_prefix(buf.buf, "get ", &arg)) { parse_get(arg); fflush(stdout); } else if (!strcmp(buf.buf, "capabilities")) { printf("stateless-connect\n"); printf("fetch\n"); printf("get\n"); printf("option\n"); printf("push\n"); printf("check-connectivity\n"); printf("object-format\n"); printf("\n"); fflush(stdout); } else if (skip_prefix(buf.buf, "stateless-connect ", &arg)) { if (!stateless_connect(arg)) break; } else { error(_("remote-curl: unknown command '%s' from git"), buf.buf); goto cleanup; } strbuf_reset(&buf); } while (1); http_cleanup(); ret = 0; cleanup: strbuf_release(&buf); return ret; }