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synced 2024-08-28 20:20:07 +00:00
![Jon Simons](/assets/img/avatar_default.png)
The packet_read_line() function will die if it sees any protocol or socket errors. But it will return NULL for a flush packet; some callers which are not expecting this may dereference NULL if they get an unexpected flush. This would involve the other side breaking protocol, but we should flag the error rather than segfault. Signed-off-by: Jon Simons <jon@jonsimons.org> Reviewed-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
625 lines
16 KiB
C
625 lines
16 KiB
C
#include "builtin.h"
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#include "config.h"
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#include "commit.h"
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#include "refs.h"
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#include "pkt-line.h"
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#include "sideband.h"
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#include "run-command.h"
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#include "remote.h"
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#include "connect.h"
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#include "send-pack.h"
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#include "quote.h"
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#include "transport.h"
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#include "version.h"
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#include "sha1-array.h"
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#include "gpg-interface.h"
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#include "cache.h"
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int option_parse_push_signed(const struct option *opt,
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const char *arg, int unset)
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{
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if (unset) {
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*(int *)(opt->value) = SEND_PACK_PUSH_CERT_NEVER;
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return 0;
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}
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switch (git_parse_maybe_bool(arg)) {
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case 1:
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*(int *)(opt->value) = SEND_PACK_PUSH_CERT_ALWAYS;
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return 0;
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case 0:
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*(int *)(opt->value) = SEND_PACK_PUSH_CERT_NEVER;
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return 0;
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}
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if (!strcasecmp("if-asked", arg)) {
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*(int *)(opt->value) = SEND_PACK_PUSH_CERT_IF_ASKED;
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return 0;
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}
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die("bad %s argument: %s", opt->long_name, arg);
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}
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static void feed_object(const unsigned char *sha1, FILE *fh, int negative)
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{
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if (negative && !has_sha1_file(sha1))
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return;
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if (negative)
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putc('^', fh);
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fputs(sha1_to_hex(sha1), fh);
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putc('\n', fh);
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}
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/*
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* Make a pack stream and spit it out into file descriptor fd
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*/
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static int pack_objects(int fd, struct ref *refs, struct oid_array *extra, struct send_pack_args *args)
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{
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/*
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* The child becomes pack-objects --revs; we feed
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* the revision parameters to it via its stdin and
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* let its stdout go back to the other end.
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*/
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struct child_process po = CHILD_PROCESS_INIT;
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FILE *po_in;
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int i;
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int rc;
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argv_array_push(&po.args, "pack-objects");
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argv_array_push(&po.args, "--all-progress-implied");
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argv_array_push(&po.args, "--revs");
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argv_array_push(&po.args, "--stdout");
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if (args->use_thin_pack)
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argv_array_push(&po.args, "--thin");
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if (args->use_ofs_delta)
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argv_array_push(&po.args, "--delta-base-offset");
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if (args->quiet || !args->progress)
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argv_array_push(&po.args, "-q");
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if (args->progress)
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argv_array_push(&po.args, "--progress");
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if (is_repository_shallow())
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argv_array_push(&po.args, "--shallow");
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po.in = -1;
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po.out = args->stateless_rpc ? -1 : fd;
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po.git_cmd = 1;
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if (start_command(&po))
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die_errno("git pack-objects failed");
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/*
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* We feed the pack-objects we just spawned with revision
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* parameters by writing to the pipe.
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*/
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po_in = xfdopen(po.in, "w");
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for (i = 0; i < extra->nr; i++)
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feed_object(extra->oid[i].hash, po_in, 1);
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while (refs) {
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if (!is_null_oid(&refs->old_oid))
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feed_object(refs->old_oid.hash, po_in, 1);
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if (!is_null_oid(&refs->new_oid))
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feed_object(refs->new_oid.hash, po_in, 0);
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refs = refs->next;
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}
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fflush(po_in);
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if (ferror(po_in))
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die_errno("error writing to pack-objects");
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fclose(po_in);
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if (args->stateless_rpc) {
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char *buf = xmalloc(LARGE_PACKET_MAX);
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while (1) {
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ssize_t n = xread(po.out, buf, LARGE_PACKET_MAX);
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if (n <= 0)
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break;
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send_sideband(fd, -1, buf, n, LARGE_PACKET_MAX);
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}
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free(buf);
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close(po.out);
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po.out = -1;
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}
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rc = finish_command(&po);
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if (rc) {
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/*
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* For a normal non-zero exit, we assume pack-objects wrote
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* something useful to stderr. For death by signal, though,
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* we should mention it to the user. The exception is SIGPIPE
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* (141), because that's a normal occurrence if the remote end
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* hangs up (and we'll report that by trying to read the unpack
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* status).
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*/
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if (rc > 128 && rc != 141)
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error("pack-objects died of signal %d", rc - 128);
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return -1;
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}
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return 0;
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}
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static int receive_unpack_status(int in)
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{
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const char *line = packet_read_line(in, NULL);
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if (!line)
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return error(_("unexpected flush packet while reading remote unpack status"));
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if (!skip_prefix(line, "unpack ", &line))
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return error(_("unable to parse remote unpack status: %s"), line);
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if (strcmp(line, "ok"))
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return error(_("remote unpack failed: %s"), line);
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return 0;
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}
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static int receive_status(int in, struct ref *refs)
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{
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struct ref *hint;
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int ret;
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hint = NULL;
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ret = receive_unpack_status(in);
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while (1) {
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char *refname;
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char *msg;
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char *line = packet_read_line(in, NULL);
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if (!line)
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break;
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if (!starts_with(line, "ok ") && !starts_with(line, "ng ")) {
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error("invalid ref status from remote: %s", line);
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ret = -1;
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break;
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}
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refname = line + 3;
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msg = strchr(refname, ' ');
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if (msg)
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*msg++ = '\0';
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/* first try searching at our hint, falling back to all refs */
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if (hint)
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hint = find_ref_by_name(hint, refname);
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if (!hint)
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hint = find_ref_by_name(refs, refname);
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if (!hint) {
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warning("remote reported status on unknown ref: %s",
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refname);
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continue;
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}
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if (hint->status != REF_STATUS_EXPECTING_REPORT) {
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warning("remote reported status on unexpected ref: %s",
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refname);
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continue;
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}
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if (line[0] == 'o' && line[1] == 'k')
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hint->status = REF_STATUS_OK;
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else {
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hint->status = REF_STATUS_REMOTE_REJECT;
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ret = -1;
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}
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hint->remote_status = xstrdup_or_null(msg);
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/* start our next search from the next ref */
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hint = hint->next;
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}
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return ret;
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}
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static int sideband_demux(int in, int out, void *data)
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{
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int *fd = data, ret;
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#ifdef NO_PTHREADS
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close(fd[1]);
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#endif
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ret = recv_sideband("send-pack", fd[0], out);
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close(out);
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return ret;
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}
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static int advertise_shallow_grafts_cb(const struct commit_graft *graft, void *cb)
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{
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struct strbuf *sb = cb;
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if (graft->nr_parent == -1)
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packet_buf_write(sb, "shallow %s\n", oid_to_hex(&graft->oid));
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return 0;
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}
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static void advertise_shallow_grafts_buf(struct strbuf *sb)
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{
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if (!is_repository_shallow())
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return;
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for_each_commit_graft(advertise_shallow_grafts_cb, sb);
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}
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#define CHECK_REF_NO_PUSH -1
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#define CHECK_REF_STATUS_REJECTED -2
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#define CHECK_REF_UPTODATE -3
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static int check_to_send_update(const struct ref *ref, const struct send_pack_args *args)
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{
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if (!ref->peer_ref && !args->send_mirror)
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return CHECK_REF_NO_PUSH;
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/* Check for statuses set by set_ref_status_for_push() */
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switch (ref->status) {
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case REF_STATUS_REJECT_NONFASTFORWARD:
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case REF_STATUS_REJECT_ALREADY_EXISTS:
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case REF_STATUS_REJECT_FETCH_FIRST:
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case REF_STATUS_REJECT_NEEDS_FORCE:
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case REF_STATUS_REJECT_STALE:
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case REF_STATUS_REJECT_NODELETE:
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return CHECK_REF_STATUS_REJECTED;
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case REF_STATUS_UPTODATE:
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return CHECK_REF_UPTODATE;
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default:
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return 0;
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}
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}
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/*
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* the beginning of the next line, or the end of buffer.
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*
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* NEEDSWORK: perhaps move this to git-compat-util.h or somewhere and
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* convert many similar uses found by "git grep -A4 memchr".
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*/
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static const char *next_line(const char *line, size_t len)
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{
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const char *nl = memchr(line, '\n', len);
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if (!nl)
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return line + len; /* incomplete line */
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return nl + 1;
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}
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static int generate_push_cert(struct strbuf *req_buf,
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const struct ref *remote_refs,
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struct send_pack_args *args,
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const char *cap_string,
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const char *push_cert_nonce)
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{
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const struct ref *ref;
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struct string_list_item *item;
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char *signing_key = xstrdup(get_signing_key());
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const char *cp, *np;
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struct strbuf cert = STRBUF_INIT;
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int update_seen = 0;
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strbuf_addstr(&cert, "certificate version 0.1\n");
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strbuf_addf(&cert, "pusher %s ", signing_key);
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datestamp(&cert);
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strbuf_addch(&cert, '\n');
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if (args->url && *args->url) {
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char *anon_url = transport_anonymize_url(args->url);
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strbuf_addf(&cert, "pushee %s\n", anon_url);
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free(anon_url);
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}
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if (push_cert_nonce[0])
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strbuf_addf(&cert, "nonce %s\n", push_cert_nonce);
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if (args->push_options)
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for_each_string_list_item(item, args->push_options)
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strbuf_addf(&cert, "push-option %s\n", item->string);
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strbuf_addstr(&cert, "\n");
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for (ref = remote_refs; ref; ref = ref->next) {
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if (check_to_send_update(ref, args) < 0)
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continue;
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update_seen = 1;
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strbuf_addf(&cert, "%s %s %s\n",
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oid_to_hex(&ref->old_oid),
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oid_to_hex(&ref->new_oid),
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ref->name);
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}
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if (!update_seen)
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goto free_return;
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if (sign_buffer(&cert, &cert, signing_key))
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die(_("failed to sign the push certificate"));
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packet_buf_write(req_buf, "push-cert%c%s", 0, cap_string);
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for (cp = cert.buf; cp < cert.buf + cert.len; cp = np) {
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np = next_line(cp, cert.buf + cert.len - cp);
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packet_buf_write(req_buf,
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"%.*s", (int)(np - cp), cp);
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}
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packet_buf_write(req_buf, "push-cert-end\n");
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free_return:
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free(signing_key);
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strbuf_release(&cert);
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return update_seen;
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}
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static int atomic_push_failure(struct send_pack_args *args,
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struct ref *remote_refs,
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struct ref *failing_ref)
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{
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struct ref *ref;
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/* Mark other refs as failed */
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for (ref = remote_refs; ref; ref = ref->next) {
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if (!ref->peer_ref && !args->send_mirror)
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continue;
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switch (ref->status) {
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case REF_STATUS_EXPECTING_REPORT:
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ref->status = REF_STATUS_ATOMIC_PUSH_FAILED;
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continue;
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default:
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break; /* do nothing */
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}
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}
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return error("atomic push failed for ref %s. status: %d\n",
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failing_ref->name, failing_ref->status);
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}
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#define NONCE_LEN_LIMIT 256
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static void reject_invalid_nonce(const char *nonce, int len)
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{
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int i = 0;
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if (NONCE_LEN_LIMIT <= len)
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die("the receiving end asked to sign an invalid nonce <%.*s>",
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len, nonce);
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for (i = 0; i < len; i++) {
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int ch = nonce[i] & 0xFF;
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if (isalnum(ch) ||
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ch == '-' || ch == '.' ||
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ch == '/' || ch == '+' ||
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ch == '=' || ch == '_')
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continue;
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die("the receiving end asked to sign an invalid nonce <%.*s>",
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len, nonce);
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}
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}
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int send_pack(struct send_pack_args *args,
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int fd[], struct child_process *conn,
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struct ref *remote_refs,
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struct oid_array *extra_have)
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{
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int in = fd[0];
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int out = fd[1];
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struct strbuf req_buf = STRBUF_INIT;
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struct strbuf cap_buf = STRBUF_INIT;
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struct ref *ref;
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int need_pack_data = 0;
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int allow_deleting_refs = 0;
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int status_report = 0;
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int use_sideband = 0;
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int quiet_supported = 0;
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int agent_supported = 0;
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int use_atomic = 0;
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int atomic_supported = 0;
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int use_push_options = 0;
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int push_options_supported = 0;
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unsigned cmds_sent = 0;
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int ret;
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struct async demux;
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const char *push_cert_nonce = NULL;
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/* Does the other end support the reporting? */
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if (server_supports("report-status"))
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status_report = 1;
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if (server_supports("delete-refs"))
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allow_deleting_refs = 1;
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if (server_supports("ofs-delta"))
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args->use_ofs_delta = 1;
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if (server_supports("side-band-64k"))
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use_sideband = 1;
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if (server_supports("quiet"))
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quiet_supported = 1;
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if (server_supports("agent"))
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agent_supported = 1;
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if (server_supports("no-thin"))
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args->use_thin_pack = 0;
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if (server_supports("atomic"))
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atomic_supported = 1;
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if (server_supports("push-options"))
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push_options_supported = 1;
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if (args->push_cert != SEND_PACK_PUSH_CERT_NEVER) {
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int len;
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push_cert_nonce = server_feature_value("push-cert", &len);
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if (push_cert_nonce) {
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reject_invalid_nonce(push_cert_nonce, len);
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push_cert_nonce = xmemdupz(push_cert_nonce, len);
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} else if (args->push_cert == SEND_PACK_PUSH_CERT_ALWAYS) {
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die(_("the receiving end does not support --signed push"));
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} else if (args->push_cert == SEND_PACK_PUSH_CERT_IF_ASKED) {
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warning(_("not sending a push certificate since the"
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" receiving end does not support --signed"
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" push"));
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}
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}
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if (!remote_refs) {
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fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
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"Perhaps you should specify a branch such as 'master'.\n");
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return 0;
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}
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if (args->atomic && !atomic_supported)
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die(_("the receiving end does not support --atomic push"));
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use_atomic = atomic_supported && args->atomic;
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if (args->push_options && !push_options_supported)
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die(_("the receiving end does not support push options"));
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use_push_options = push_options_supported && args->push_options;
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if (status_report)
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strbuf_addstr(&cap_buf, " report-status");
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if (use_sideband)
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strbuf_addstr(&cap_buf, " side-band-64k");
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if (quiet_supported && (args->quiet || !args->progress))
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strbuf_addstr(&cap_buf, " quiet");
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if (use_atomic)
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strbuf_addstr(&cap_buf, " atomic");
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if (use_push_options)
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strbuf_addstr(&cap_buf, " push-options");
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if (agent_supported)
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strbuf_addf(&cap_buf, " agent=%s", git_user_agent_sanitized());
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/*
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* NEEDSWORK: why does delete-refs have to be so specific to
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* send-pack machinery that set_ref_status_for_push() cannot
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* set this bit for us???
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*/
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for (ref = remote_refs; ref; ref = ref->next)
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if (ref->deletion && !allow_deleting_refs)
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ref->status = REF_STATUS_REJECT_NODELETE;
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if (!args->dry_run)
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advertise_shallow_grafts_buf(&req_buf);
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if (!args->dry_run && push_cert_nonce)
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cmds_sent = generate_push_cert(&req_buf, remote_refs, args,
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cap_buf.buf, push_cert_nonce);
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/*
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* Clear the status for each ref and see if we need to send
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* the pack data.
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*/
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for (ref = remote_refs; ref; ref = ref->next) {
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switch (check_to_send_update(ref, args)) {
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case 0: /* no error */
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break;
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case CHECK_REF_STATUS_REJECTED:
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/*
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* When we know the server would reject a ref update if
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* we were to send it and we're trying to send the refs
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* atomically, abort the whole operation.
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*/
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if (use_atomic) {
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strbuf_release(&req_buf);
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strbuf_release(&cap_buf);
|
|
return atomic_push_failure(args, remote_refs, ref);
|
|
}
|
|
/* else fallthrough */
|
|
default:
|
|
continue;
|
|
}
|
|
if (!ref->deletion)
|
|
need_pack_data = 1;
|
|
|
|
if (args->dry_run || !status_report)
|
|
ref->status = REF_STATUS_OK;
|
|
else
|
|
ref->status = REF_STATUS_EXPECTING_REPORT;
|
|
}
|
|
|
|
/*
|
|
* Finally, tell the other end!
|
|
*/
|
|
for (ref = remote_refs; ref; ref = ref->next) {
|
|
char *old_hex, *new_hex;
|
|
|
|
if (args->dry_run || push_cert_nonce)
|
|
continue;
|
|
|
|
if (check_to_send_update(ref, args) < 0)
|
|
continue;
|
|
|
|
old_hex = oid_to_hex(&ref->old_oid);
|
|
new_hex = oid_to_hex(&ref->new_oid);
|
|
if (!cmds_sent) {
|
|
packet_buf_write(&req_buf,
|
|
"%s %s %s%c%s",
|
|
old_hex, new_hex, ref->name, 0,
|
|
cap_buf.buf);
|
|
cmds_sent = 1;
|
|
} else {
|
|
packet_buf_write(&req_buf, "%s %s %s",
|
|
old_hex, new_hex, ref->name);
|
|
}
|
|
}
|
|
|
|
if (use_push_options) {
|
|
struct string_list_item *item;
|
|
|
|
packet_buf_flush(&req_buf);
|
|
for_each_string_list_item(item, args->push_options)
|
|
packet_buf_write(&req_buf, "%s", item->string);
|
|
}
|
|
|
|
if (args->stateless_rpc) {
|
|
if (!args->dry_run && (cmds_sent || is_repository_shallow())) {
|
|
packet_buf_flush(&req_buf);
|
|
send_sideband(out, -1, req_buf.buf, req_buf.len, LARGE_PACKET_MAX);
|
|
}
|
|
} else {
|
|
write_or_die(out, req_buf.buf, req_buf.len);
|
|
packet_flush(out);
|
|
}
|
|
strbuf_release(&req_buf);
|
|
strbuf_release(&cap_buf);
|
|
|
|
if (use_sideband && cmds_sent) {
|
|
memset(&demux, 0, sizeof(demux));
|
|
demux.proc = sideband_demux;
|
|
demux.data = fd;
|
|
demux.out = -1;
|
|
demux.isolate_sigpipe = 1;
|
|
if (start_async(&demux))
|
|
die("send-pack: unable to fork off sideband demultiplexer");
|
|
in = demux.out;
|
|
}
|
|
|
|
if (need_pack_data && cmds_sent) {
|
|
if (pack_objects(out, remote_refs, extra_have, args) < 0) {
|
|
for (ref = remote_refs; ref; ref = ref->next)
|
|
ref->status = REF_STATUS_NONE;
|
|
if (args->stateless_rpc)
|
|
close(out);
|
|
if (git_connection_is_socket(conn))
|
|
shutdown(fd[0], SHUT_WR);
|
|
|
|
/*
|
|
* Do not even bother with the return value; we know we
|
|
* are failing, and just want the error() side effects.
|
|
*/
|
|
if (status_report)
|
|
receive_unpack_status(in);
|
|
|
|
if (use_sideband) {
|
|
close(demux.out);
|
|
finish_async(&demux);
|
|
}
|
|
fd[1] = -1;
|
|
return -1;
|
|
}
|
|
if (!args->stateless_rpc)
|
|
/* Closed by pack_objects() via start_command() */
|
|
fd[1] = -1;
|
|
}
|
|
if (args->stateless_rpc && cmds_sent)
|
|
packet_flush(out);
|
|
|
|
if (status_report && cmds_sent)
|
|
ret = receive_status(in, remote_refs);
|
|
else
|
|
ret = 0;
|
|
if (args->stateless_rpc)
|
|
packet_flush(out);
|
|
|
|
if (use_sideband && cmds_sent) {
|
|
close(demux.out);
|
|
if (finish_async(&demux)) {
|
|
error("error in sideband demultiplexer");
|
|
ret = -1;
|
|
}
|
|
}
|
|
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (args->porcelain)
|
|
return 0;
|
|
|
|
for (ref = remote_refs; ref; ref = ref->next) {
|
|
switch (ref->status) {
|
|
case REF_STATUS_NONE:
|
|
case REF_STATUS_UPTODATE:
|
|
case REF_STATUS_OK:
|
|
break;
|
|
default:
|
|
return -1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|