thodg/got/libexec/got-read-tree/got-read-tree.c

• Show log

  Commit

• Hash : 9985f404
  Author :
  Date : 2022-05-19T06:40:09
  

  parse tree entries into an array instead of a pathlist Avoids some extra malloc/free in a performance-critical path. ok op@

Download

• libexec/got-read-tree/got-read-tree.c

• /*
   * Copyright (c) 2018, 2019, 2020 Stefan Sperling <stsp@openbsd.org>
   *
   * Permission to use, copy, modify, and distribute this software for any
   * purpose with or without fee is hereby granted, provided that the above
   * copyright notice and this permission notice appear in all copies.
   *
   * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   */
  
  #include <sys/types.h>
  #include <sys/queue.h>
  #include <sys/uio.h>
  #include <sys/time.h>
  
  #include <stdint.h>
  #include <imsg.h>
  #include <limits.h>
  #include <signal.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <sha1.h>
  #include <unistd.h>
  #include <zlib.h>
  
  #include "got_error.h"
  #include "got_object.h"
  #include "got_path.h"
  
  #include "got_lib_delta.h"
  #include "got_lib_inflate.h"
  #include "got_lib_object.h"
  #include "got_lib_object_parse.h"
  #include "got_lib_privsep.h"
  #include "got_lib_sha1.h"
  
  static volatile sig_atomic_t sigint_received;
  
  static void
  catch_sigint(int signo)
  {
  	sigint_received = 1;
  }
  
  static const struct got_error *
  read_tree_object(struct got_parsed_tree_entry **entries, int *nentries,
      uint8_t **p, FILE *f, struct got_object_id *expected_id)
  {
  	const struct got_error *err = NULL;
  	struct got_object *obj = NULL;
  	size_t len;
  	struct got_inflate_checksum csum;
  	SHA1_CTX sha1_ctx;
  	struct got_object_id id;
  
  	SHA1Init(&sha1_ctx);
  	memset(&csum, 0, sizeof(csum));
  	csum.output_sha1 = &sha1_ctx;
  
  	err = got_inflate_to_mem(p, &len, NULL, &csum, f);
  	if (err)
  		return err;
  
  	SHA1Final(id.sha1, &sha1_ctx);
  	if (memcmp(expected_id->sha1, id.sha1, SHA1_DIGEST_LENGTH) != 0) {
  		char buf[SHA1_DIGEST_STRING_LENGTH];
  		err = got_error_fmt(GOT_ERR_OBJ_CSUM,
  		    "checksum failure for object %s",
  		    got_sha1_digest_to_str(expected_id->sha1, buf,
  		    sizeof(buf)));
  		goto done;
  	}
  
  	err = got_object_parse_header(&obj, *p, len);
  	if (err)
  		goto done;
  
  	if (len < obj->hdrlen + obj->size) {
  		err = got_error(GOT_ERR_BAD_OBJ_DATA);
  		goto done;
  	}
  
  	/* Skip object header. */
  	len -= obj->hdrlen;
  	err = got_object_parse_tree(entries, nentries, *p + obj->hdrlen, len);
  done:
  	if (obj)
  		got_object_close(obj);
  	return err;
  }
  
  int
  main(int argc, char *argv[])
  {
  	const struct got_error *err = NULL;
  	struct imsgbuf ibuf;
  	size_t datalen;
  
  	signal(SIGINT, catch_sigint);
  
  	imsg_init(&ibuf, GOT_IMSG_FD_CHILD);
  
  #ifndef PROFILE
  	/* revoke access to most system calls */
  	if (pledge("stdio recvfd", NULL) == -1) {
  		err = got_error_from_errno("pledge");
  		got_privsep_send_error(&ibuf, err);
  		return 1;
  	}
  #endif
  
  	for (;;) {
  		struct imsg imsg;
  		FILE *f = NULL;
  		struct got_parsed_tree_entry *entries = NULL;
  		int nentries = 0;
  		uint8_t *buf = NULL;
  		struct got_object_id expected_id;
  
  		if (sigint_received) {
  			err = got_error(GOT_ERR_CANCELLED);
  			break;
  		}
  
  		err = got_privsep_recv_imsg(&imsg, &ibuf, 0);
  		if (err) {
  			if (err->code == GOT_ERR_PRIVSEP_PIPE)
  				err = NULL;
  			break;
  		}
  
  		if (imsg.hdr.type == GOT_IMSG_STOP)
  			break;
  
  		if (imsg.hdr.type != GOT_IMSG_TREE_REQUEST) {
  			err = got_error(GOT_ERR_PRIVSEP_MSG);
  			goto done;
  		}
  
  		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
  		if (datalen != sizeof(expected_id)) {
  			err = got_error(GOT_ERR_PRIVSEP_LEN);
  			goto done;
  		}
  		memcpy(&expected_id, imsg.data, sizeof(expected_id));
  
  		if (imsg.fd == -1) {
  			err = got_error(GOT_ERR_PRIVSEP_NO_FD);
  			goto done;
  		}
  
  		/* Always assume file offset zero. */
  		f = fdopen(imsg.fd, "rb");
  		if (f == NULL) {
  			err = got_error_from_errno("fdopen");
  			goto done;
  		}
  
  		err = read_tree_object(&entries, &nentries, &buf, f,
  		    &expected_id);
  		if (err)
  			goto done;
  
  		err = got_privsep_send_tree(&ibuf, entries, nentries);
  done:
  		free(entries);
  		free(buf);
  		if (f) {
  			if (fclose(f) == EOF && err == NULL)
  				err = got_error_from_errno("fclose");
  		} else if (imsg.fd != -1) {
  			if (close(imsg.fd) == -1 && err == NULL)
  				err = got_error_from_errno("close");
  		}
  		imsg_free(&imsg);
  		if (err)
  			break;
  	}
  
  	imsg_clear(&ibuf);
  	if (err) {
  		if (!sigint_received && err->code != GOT_ERR_PRIVSEP_PIPE) {
  			fprintf(stderr, "%s: %s\n", getprogname(), err->msg);
  			got_privsep_send_error(&ibuf, err);
  		}
  	}
  	if (close(GOT_IMSG_FD_CHILD) == -1 && err == NULL)
  		err = got_error_from_errno("close");
  	return err ? 1 : 0;
  }
  

Download