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

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• Hash : 876c234b
  Author :
  Date : 2018-09-10T12:30:47
  

  start reading pack files with privsep; still WIP

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

• /*
   * Copyright (c) 2018 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 <sys/limits.h>
  #include <sys/syslimits.h>
  
  #include <stdint.h>
  #include <imsg.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <sha1.h>
  #include <zlib.h>
  
  #include "got_error.h"
  #include "got_object.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"
  
  static const struct got_error *
  read_tree_object(struct got_tree_object **tree, struct got_object *obj, FILE *f)
  {
  	const struct got_error *err = NULL;
  	size_t len;
  	uint8_t *p;
  
  	if (obj->flags & GOT_OBJ_FLAG_PACKED)
  		err = got_read_file_to_mem(&p, &len, f);
  	else
  		err = got_inflate_to_mem(&p, &len, f);
  	if (err)
  		return err;
  
  	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(tree, p + obj->hdrlen, len);
  	free(p);
  done:
  	return err;
  }
  
  int
  main(int argc, char *argv[])
  {
  	const struct got_error *err = NULL;
  	struct got_tree_object *tree = NULL;
  	struct imsgbuf ibuf;
  	size_t datalen;
  
  	imsg_init(&ibuf, GOT_IMSG_FD_CHILD);
  
  	/* revoke access to most system calls */
  	if (pledge("stdio recvfd", NULL) == -1) {
  		err = got_error_from_errno();
  		got_privsep_send_error(&ibuf, err);
  		return 1;
  	}
  
  	while (1) {
  		struct imsg imsg;
  		struct got_imsg_object iobj;
  		FILE *f = NULL;
  		struct got_object *obj = NULL;
  	
  		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(iobj)) {
  			err = got_error(GOT_ERR_PRIVSEP_LEN);
  			goto done;
  		}
  
  		memcpy(&iobj, imsg.data, sizeof(iobj));
  		if (iobj.type != GOT_OBJ_TYPE_TREE) {
  			err = got_error(GOT_ERR_OBJ_TYPE);
  			goto done;
  		}
  
  		if (imsg.fd == -1) {
  			err = got_error(GOT_ERR_PRIVSEP_NO_FD);
  			goto done;
  		}
  
  		obj = calloc(1, sizeof(*obj));
  		if (obj == NULL) {
  			err = got_error_from_errno();
  			goto done;
  		}
  		obj->type = iobj.type;
  		obj->hdrlen = iobj.hdrlen;
  		obj->size = iobj.size;
  
  		/* Always assume file offset zero. */
  		f = fdopen(imsg.fd, "rb");
  		if (f == NULL) {
  			err = got_error_from_errno();
  			goto done;
  		}
  
  		err = read_tree_object(&tree, obj, f);
  		if (err)
  			goto done;
  
  		err = got_privsep_send_tree(&ibuf, tree);
  done:
  		if (f)
  			fclose(f);
  		else if (imsg.fd != -1)
  			close(imsg.fd);
  		imsg_free(&imsg);
  		if (obj)
  			got_object_close(obj);
  		if (err) {
  			if (err->code == GOT_ERR_PRIVSEP_PIPE)
  				err = NULL;
  			else
  				got_privsep_send_error(&ibuf, err);
  			break;
  		}
  	}
  
  	imsg_clear(&ibuf);
  	if (err)
  		fprintf(stderr, "%s: %s\n", getprogname(), err->msg);
  	close(GOT_IMSG_FD_CHILD);
  	return err ? 1 : 0;
  }
  

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