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

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• Hash : 81a12da5
  Author :
  Date : 2020-09-09T19:35:32
  

  do not rely on <zlib.h> to pull in <unistd.h> ok stsp

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

• /*
   * Copyright (c) 2018, 2019 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/syslimits.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_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 volatile sig_atomic_t sigint_received;
  
  static void
  catch_sigint(int signo)
  {
  	sigint_received = 1;
  }
  
  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, imsg_outfd;
  		FILE *f = NULL;
  		size_t size;
  		struct got_object *obj = NULL;
  		uint8_t *buf = NULL;
  
  		memset(&imsg, 0, sizeof(imsg));
  		imsg.fd = -1;
  		memset(&imsg_outfd, 0, sizeof(imsg_outfd));
  		imsg_outfd.fd = -1;
  
  		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_BLOB_REQUEST) {
  			err = got_error(GOT_ERR_PRIVSEP_MSG);
  			goto done;
  		}
  
  		if (imsg.fd == -1) {
  			err = got_error(GOT_ERR_PRIVSEP_NO_FD);
  			goto done;
  		}
  
  		err = got_privsep_recv_imsg(&imsg_outfd, &ibuf, 0);
  		if (err) {
  			if (imsg.hdr.len == 0)
  				err = NULL;
  			break;
  		}
  
  		if (imsg_outfd.hdr.type == GOT_IMSG_STOP)
  			break;
  
  		if (imsg_outfd.hdr.type != GOT_IMSG_BLOB_OUTFD) {
  			err = got_error(GOT_ERR_PRIVSEP_MSG);
  			goto done;
  		}
  
  		datalen = imsg_outfd.hdr.len - IMSG_HEADER_SIZE;
  		if (datalen != 0) {
  			err = got_error(GOT_ERR_PRIVSEP_LEN);
  			goto done;
  		}
  		if (imsg_outfd.fd == -1) {
  			err = got_error(GOT_ERR_PRIVSEP_NO_FD);
  			goto done;
  		}
  
  		err = got_object_read_header(&obj, imsg.fd);
  		if (err)
  			goto done;
  
  		if (lseek(imsg.fd, SEEK_SET, 0) == -1) {
  			err = got_error_from_errno("lseek");
  			goto done;
  		}
  
  		f = fdopen(imsg.fd, "rb");
  		if (f == NULL) {
  			err = got_error_from_errno("fdopen");
  			goto done;
  		}
  
  		if (obj->size + obj->hdrlen <=
  		    GOT_PRIVSEP_INLINE_BLOB_DATA_MAX) {
  			err = got_inflate_to_mem(&buf, &size, NULL, f);
  			if (err)
  				goto done;
  		} else {
  			err = got_inflate_to_fd(&size, f, imsg_outfd.fd);
  			if (err)
  				goto done;
  		}
  
  		if (size < obj->hdrlen) {
  			err = got_error(GOT_ERR_BAD_OBJ_HDR);
  			goto done;
  		}
  
  		err = got_privsep_send_blob(&ibuf, size, obj->hdrlen, buf);
  done:
  		free(buf);
  		if (f) {
  			if (fclose(f) != 0 && err == NULL)
  				err = got_error_from_errno("fclose");
  		} else if (imsg.fd != -1) {
  			if (close(imsg.fd) != 0 && err == NULL)
  				err = got_error_from_errno("close");
  		}
  		if (imsg_outfd.fd != -1) {
  			if (close(imsg_outfd.fd) != 0 && err == NULL)
  				err = got_error_from_errno("close");
  		}
  
  		imsg_free(&imsg);
  		imsg_free(&imsg_outfd);
  		if (obj)
  			got_object_close(obj);
  		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) != 0 && err == NULL)
  		err = got_error_from_errno("close");
  	return err ? 1 : 0;
  }
  

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