/*
* 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_privsep.h"
#ifndef nitems
#define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
#endif
#define GOT_OBJ_TAG_COMMIT "commit"
#define GOT_OBJ_TAG_TREE "tree"
#define GOT_OBJ_TAG_BLOB "blob"
static const struct got_error *
parse_object_header(struct got_object **obj, char *buf, size_t len)
{
const char *obj_tags[] = {
GOT_OBJ_TAG_COMMIT,
GOT_OBJ_TAG_TREE,
GOT_OBJ_TAG_BLOB
};
const int obj_types[] = {
GOT_OBJ_TYPE_COMMIT,
GOT_OBJ_TYPE_TREE,
GOT_OBJ_TYPE_BLOB,
};
int type = 0;
size_t size = 0, hdrlen = 0;
int i;
char *p = strchr(buf, '\0');
if (p == NULL)
return got_error(GOT_ERR_BAD_OBJ_HDR);
hdrlen = strlen(buf) + 1 /* '\0' */;
for (i = 0; i < nitems(obj_tags); i++) {
const char *tag = obj_tags[i];
size_t tlen = strlen(tag);
const char *errstr;
if (strncmp(buf, tag, tlen) != 0)
continue;
type = obj_types[i];
if (len <= tlen)
return got_error(GOT_ERR_BAD_OBJ_HDR);
size = strtonum(buf + tlen, 0, LONG_MAX, &errstr);
if (errstr != NULL)
return got_error(GOT_ERR_BAD_OBJ_HDR);
break;
}
if (type == 0)
return got_error(GOT_ERR_BAD_OBJ_HDR);
*obj = calloc(1, sizeof(**obj));
if (*obj == NULL)
return got_error_from_errno();
(*obj)->type = type;
(*obj)->hdrlen = hdrlen;
(*obj)->size = size;
return NULL;
}
static const struct got_error *
read_object_header(struct got_object **obj, int fd)
{
const struct got_error *err;
struct got_zstream_buf zb;
char *buf;
const size_t zbsize = 64;
size_t outlen, totlen;
int nbuf = 1;
buf = malloc(zbsize);
if (buf == NULL)
return got_error_from_errno();
err = got_inflate_init(&zb, buf, zbsize);
if (err)
return err;
totlen = 0;
do {
err = got_inflate_read_fd(&zb, fd, &outlen);
if (err)
goto done;
if (outlen == 0)
break;
totlen += outlen;
if (strchr(zb.outbuf, '\0') == NULL) {
char *newbuf;
nbuf++;
newbuf = recallocarray(buf, nbuf - 1, nbuf, zbsize);
if (newbuf == NULL) {
err = got_error_from_errno();
goto done;
}
buf = newbuf;
zb.outbuf = newbuf + totlen;
zb.outlen = (nbuf * zbsize) - totlen;
}
} while (strchr(zb.outbuf, '\0') == NULL);
err = parse_object_header(obj, buf, totlen);
done:
free(buf);
got_inflate_end(&zb);
return err;
}
int
main(int argc, char *argv[])
{
const struct got_error *err = NULL;
struct got_object *obj = NULL;
struct imsg imsg;
struct imsgbuf ibuf;
size_t datalen;
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();
got_privsep_send_error(&ibuf, err);
return 1;
}
#endif
while (1) {
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_OBJECT_REQUEST) {
err = got_error(GOT_ERR_PRIVSEP_MSG);
goto done;
}
datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
if (datalen != 0) {
err = got_error(GOT_ERR_PRIVSEP_LEN);
goto done;
}
err = read_object_header(&obj, imsg.fd);
if (err)
goto done;
err = got_privsep_send_obj(&ibuf, obj);
done:
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;
}
