/*
* 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/stat.h>
#include <sys/queue.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sha1.h>
#include <zlib.h>
#include <ctype.h>
#include <limits.h>
#include "got_error.h"
#include "got_object.h"
#include "got_repository.h"
#include "got_sha1_lib.h"
#include "got_delta_lib.h"
#include "got_pack_lib.h"
#include "got_zbuf_lib.h"
#include "got_object_lib.h"
#ifndef MIN
#define MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
#endif
#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"
#define GOT_COMMIT_TAG_TREE "tree "
#define GOT_COMMIT_TAG_PARENT "parent "
#define GOT_COMMIT_TAG_AUTHOR "author "
#define GOT_COMMIT_TAG_COMMITTER "committer "
const struct got_error *
got_object_id_str(char **outbuf, struct got_object_id *id)
{
static const size_t len = SHA1_DIGEST_STRING_LENGTH;
*outbuf = calloc(1, len);
if (*outbuf == NULL)
return got_error(GOT_ERR_NO_MEM);
if (got_sha1_digest_to_str(id->sha1, *outbuf, len) == NULL) {
free(*outbuf);
*outbuf = NULL;
return got_error(GOT_ERR_BAD_OBJ_ID_STR);
}
return NULL;
}
int
got_object_id_cmp(struct got_object_id *id1, struct got_object_id *id2)
{
return memcmp(id1->sha1, id2->sha1, SHA1_DIGEST_LENGTH);
}
int
got_object_get_type(struct got_object *obj)
{
switch (obj->type) {
case GOT_OBJ_TYPE_COMMIT:
case GOT_OBJ_TYPE_TREE:
case GOT_OBJ_TYPE_BLOB:
case GOT_OBJ_TYPE_TAG:
return obj->type;
default:
abort();
break;
}
/* not reached */
return 0;
}
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(GOT_ERR_NO_MEM);
(*obj)->type = type;
(*obj)->hdrlen = hdrlen;
(*obj)->size = size;
return NULL;
}
static const struct got_error *
read_object_header(struct got_object **obj, struct got_repository *repo,
FILE *f)
{
const struct got_error *err;
struct got_zstream_buf zb;
char *buf;
const size_t zbsize = 64;
size_t outlen, totlen;
int i;
buf = calloc(zbsize, sizeof(char));
if (buf == NULL)
return got_error(GOT_ERR_NO_MEM);
err = got_inflate_init(&zb, zbsize);
if (err)
return err;
i = 0;
totlen = 0;
do {
err = got_inflate_read(&zb, f, &outlen);
if (err)
goto done;
if (strchr(zb.outbuf, '\0') == NULL) {
buf = recallocarray(buf, 1 + i, 2 + i, zbsize);
if (buf == NULL) {
err = got_error(GOT_ERR_NO_MEM);
goto done;
}
}
memcpy(buf + totlen, zb.outbuf, outlen);
totlen += outlen;
i++;
} while (strchr(zb.outbuf, '\0') == NULL);
err = parse_object_header(obj, buf, totlen);
done:
got_inflate_end(&zb);
return err;
}
static const struct got_error *
object_path(char **path, struct got_object_id *id, struct got_repository *repo)
{
const struct got_error *err = NULL;
char *hex;
char *path_objects = got_repo_get_path_objects(repo);
if (path_objects == NULL)
return got_error(GOT_ERR_NO_MEM);
err = got_object_id_str(&hex, id);
if (err)
return err;
if (asprintf(path, "%s/%.2x/%s", path_objects,
id->sha1[0], hex + 2) == -1)
err = got_error(GOT_ERR_NO_MEM);
free(hex);
free(path_objects);
return err;
}
static const struct got_error *
open_loose_object(FILE **f, struct got_object *obj, struct got_repository *repo)
{
const struct got_error *err = NULL;
char *path;
err = object_path(&path, &obj->id, repo);
if (err)
return err;
*f = fopen(path, "rb");
if (*f == NULL) {
err = got_error_from_errno();
goto done;
}
done:
free(path);
return err;
}
const struct got_error *
got_object_open(struct got_object **obj, struct got_repository *repo,
struct got_object_id *id)
{
const struct got_error *err = NULL;
char *path;
FILE *f;
err = object_path(&path, id, repo);
if (err)
return err;
f = fopen(path, "rb");
if (f == NULL) {
if (errno != ENOENT) {
err = got_error_from_errno();
goto done;
}
err = got_packfile_open_object(obj, id, repo);
if (err)
goto done;
if (*obj == NULL)
err = got_error(GOT_ERR_NO_OBJ);
} else {
err = read_object_header(obj, repo, f);
if (err)
goto done;
memcpy((*obj)->id.sha1, id->sha1, SHA1_DIGEST_LENGTH);
}
done:
free(path);
if (err && f)
fclose(f);
return err;
}
const struct got_error *
got_object_open_by_id_str(struct got_object **obj, struct got_repository *repo,
const char *id_str)
{
struct got_object_id id;
if (!got_parse_sha1_digest(id.sha1, id_str))
return got_error(GOT_ERR_BAD_OBJ_ID_STR);
return got_object_open(obj, repo, &id);
}
void
got_object_close(struct got_object *obj)
{
if (obj->flags & GOT_OBJ_FLAG_DELTIFIED) {
struct got_delta *delta;
while (!SIMPLEQ_EMPTY(&obj->deltas.entries)) {
delta = SIMPLEQ_FIRST(&obj->deltas.entries);
SIMPLEQ_REMOVE_HEAD(&obj->deltas.entries, entry);
got_delta_close(delta);
}
}
if (obj->flags & GOT_OBJ_FLAG_PACKED)
free(obj->path_packfile);
free(obj);
}
static const struct got_error *
parse_commit_object(struct got_commit_object **commit, char *buf, size_t len)
{
const struct got_error *err = NULL;
char *s = buf;
size_t tlen;
ssize_t remain = (ssize_t)len;
*commit = calloc(1, sizeof(**commit));
if (*commit == NULL)
return got_error(GOT_ERR_NO_MEM);
(*commit)->tree_id = calloc(1, sizeof(*(*commit)->tree_id));
if ((*commit)->tree_id == NULL) {
free(*commit);
*commit = NULL;
return got_error(GOT_ERR_NO_MEM);
}
SIMPLEQ_INIT(&(*commit)->parent_ids);
tlen = strlen(GOT_COMMIT_TAG_TREE);
if (strncmp(s, GOT_COMMIT_TAG_TREE, tlen) == 0) {
remain -= tlen;
if (remain < SHA1_DIGEST_STRING_LENGTH) {
err = got_error(GOT_ERR_BAD_OBJ_DATA);
goto done;
}
s += tlen;
if (!got_parse_sha1_digest((*commit)->tree_id->sha1, s)) {
err = got_error(GOT_ERR_BAD_OBJ_DATA);
goto done;
}
remain -= SHA1_DIGEST_STRING_LENGTH;
s += SHA1_DIGEST_STRING_LENGTH;
} else {
err = got_error(GOT_ERR_BAD_OBJ_DATA);
goto done;
}
tlen = strlen(GOT_COMMIT_TAG_PARENT);
while (strncmp(s, GOT_COMMIT_TAG_PARENT, tlen) == 0) {
struct got_parent_id *pid;
remain -= tlen;
if (remain < SHA1_DIGEST_STRING_LENGTH) {
err = got_error(GOT_ERR_BAD_OBJ_DATA);
goto done;
}
pid = calloc(1, sizeof(*pid));
if (pid == NULL) {
err = got_error(GOT_ERR_NO_MEM);
goto done;
}
pid->id = calloc(1, sizeof(*pid->id));
if (pid->id == NULL) {
free(pid);
err = got_error(GOT_ERR_NO_MEM);
goto done;
}
s += tlen;
if (!got_parse_sha1_digest(pid->id->sha1, s)) {
err = got_error(GOT_ERR_BAD_OBJ_DATA);
free(pid->id);
free(pid);
goto done;
}
SIMPLEQ_INSERT_TAIL(&(*commit)->parent_ids, pid, entry);
(*commit)->nparents++;
remain -= SHA1_DIGEST_STRING_LENGTH;
s += SHA1_DIGEST_STRING_LENGTH;
}
tlen = strlen(GOT_COMMIT_TAG_AUTHOR);
if (strncmp(s, GOT_COMMIT_TAG_AUTHOR, tlen) == 0) {
char *p;
remain -= tlen;
if (remain <= 0) {
err = got_error(GOT_ERR_BAD_OBJ_DATA);
goto done;
}
s += tlen;
p = strchr(s, '\n');
if (p == NULL) {
err = got_error(GOT_ERR_BAD_OBJ_DATA);
goto done;
}
*p = '\0';
(*commit)->author = strdup(s);
if ((*commit)->author == NULL) {
err = got_error(GOT_ERR_NO_MEM);
goto done;
}
s += strlen((*commit)->author) + 1;
remain -= strlen((*commit)->author) + 1;
}
tlen = strlen(GOT_COMMIT_TAG_COMMITTER);
if (strncmp(s, GOT_COMMIT_TAG_COMMITTER, tlen) == 0) {
char *p;
remain -= tlen;
if (remain <= 0) {
err = got_error(GOT_ERR_BAD_OBJ_DATA);
goto done;
}
s += tlen;
p = strchr(s, '\n');
if (p == NULL) {
err = got_error(GOT_ERR_BAD_OBJ_DATA);
goto done;
}
*p = '\0';
(*commit)->committer = strdup(s);
if ((*commit)->committer == NULL) {
err = got_error(GOT_ERR_NO_MEM);
goto done;
}
s += strlen((*commit)->committer) + 1;
remain -= strlen((*commit)->committer) + 1;
}
(*commit)->logmsg = strndup(s, remain);
if ((*commit)->logmsg == NULL) {
err = got_error(GOT_ERR_NO_MEM);
goto done;
}
done:
if (err) {
got_object_commit_close(*commit);
*commit = NULL;
}
return err;
}
static void
tree_entry_close(struct got_tree_entry *te)
{
free(te->id);
free(te->name);
free(te);
}
static const struct got_error *
parse_tree_entry(struct got_tree_entry **te, size_t *elen, char *buf,
size_t maxlen)
{
char *p = buf, *space;
const struct got_error *err = NULL;
*te = calloc(1, sizeof(**te));
if (*te == NULL)
return got_error(GOT_ERR_NO_MEM);
(*te)->id = calloc(1, sizeof(*(*te)->id));
if ((*te)->id == NULL) {
free(*te);
*te = NULL;
return got_error(GOT_ERR_NO_MEM);
}
*elen = strlen(buf) + 1;
if (*elen > maxlen) {
free(*te);
*te = NULL;
return got_error(GOT_ERR_BAD_OBJ_DATA);
}
space = strchr(buf, ' ');
if (space == NULL) {
free(*te);
*te = NULL;
return got_error(GOT_ERR_BAD_OBJ_DATA);
}
while (*p != ' ') {
if (*p < '0' && *p > '7') {
err = got_error(GOT_ERR_BAD_OBJ_DATA);
goto done;
}
(*te)->mode <<= 3;
(*te)->mode |= *p - '0';
p++;
}
(*te)->name = strdup(space + 1);
if (*elen > maxlen || maxlen - *elen < SHA1_DIGEST_LENGTH) {
err = got_error(GOT_ERR_BAD_OBJ_DATA);
goto done;
}
buf += strlen(buf) + 1;
memcpy((*te)->id->sha1, buf, SHA1_DIGEST_LENGTH);
*elen += SHA1_DIGEST_LENGTH;
done:
if (err) {
tree_entry_close(*te);
*te = NULL;
}
return err;
}
static const struct got_error *
parse_tree_object(struct got_tree_object **tree, struct got_repository *repo,
char *buf, size_t len)
{
const struct got_error *err;
size_t remain = len;
*tree = calloc(1, sizeof(**tree));
if (*tree == NULL)
return got_error(GOT_ERR_NO_MEM);
SIMPLEQ_INIT(&(*tree)->entries);
while (remain > 0) {
struct got_tree_entry *te;
size_t elen;
err = parse_tree_entry(&te, &elen, buf, remain);
if (err)
return err;
(*tree)->nentries++;
SIMPLEQ_INSERT_TAIL(&(*tree)->entries, te, entry);
buf += elen;
remain -= elen;
}
if (remain != 0) {
got_object_tree_close(*tree);
return got_error(GOT_ERR_BAD_OBJ_DATA);
}
return NULL;
}
static const struct got_error *
read_to_mem(uint8_t **outbuf, size_t *outlen, FILE *f)
{
const struct got_error *err = NULL;
static const size_t blocksize = 512;
size_t n, total, remain;
uint8_t *buf;
*outbuf = NULL;
*outlen = 0;
buf = calloc(1, blocksize);
if (buf == NULL)
return got_error(GOT_ERR_NO_MEM);
remain = blocksize;
total = 0;
while (1) {
if (remain == 0) {
uint8_t *newbuf;
newbuf = reallocarray(buf, 1, total + blocksize);
if (newbuf == NULL) {
err = got_error(GOT_ERR_NO_MEM);
goto done;
}
buf = newbuf;
remain += blocksize;
}
n = fread(buf + total, 1, remain, f);
if (n == 0) {
if (ferror(f)) {
err = got_ferror(f, GOT_ERR_IO);
goto done;
}
break; /* EOF */
}
remain -= n;
total += n;
};
done:
if (err == NULL) {
*outbuf = buf;
*outlen = total;
} else
free(buf);
return err;
}
static const struct got_error *
read_commit_object(struct got_commit_object **commit,
struct got_repository *repo, 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 = read_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 = parse_commit_object(commit, p + obj->hdrlen, len);
free(p);
done:
return err;
}
const struct got_error *
got_object_commit_open(struct got_commit_object **commit,
struct got_repository *repo, struct got_object *obj)
{
const struct got_error *err = NULL;
FILE *f;
if (obj->type != GOT_OBJ_TYPE_COMMIT)
return got_error(GOT_ERR_OBJ_TYPE);
if (obj->flags & GOT_OBJ_FLAG_PACKED)
err = got_packfile_extract_object(&f, obj, repo);
else
err = open_loose_object(&f, obj, repo);
if (err)
return err;
err = read_commit_object(commit, repo, obj, f);
fclose(f);
return err;
}
void
got_object_commit_close(struct got_commit_object *commit)
{
struct got_parent_id *pid;
while (!SIMPLEQ_EMPTY(&commit->parent_ids)) {
pid = SIMPLEQ_FIRST(&commit->parent_ids);
SIMPLEQ_REMOVE_HEAD(&commit->parent_ids, entry);
free(pid->id);
free(pid);
}
free(commit->tree_id);
free(commit->author);
free(commit->committer);
free(commit->logmsg);
free(commit);
}
static const struct got_error *
read_tree_object(struct got_tree_object **tree,
struct got_repository *repo, 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 = read_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 = parse_tree_object(tree, repo, p + obj->hdrlen, len);
free(p);
done:
return err;
}
const struct got_error *
got_object_tree_open(struct got_tree_object **tree,
struct got_repository *repo, struct got_object *obj)
{
const struct got_error *err = NULL;
FILE *f;
if (obj->type != GOT_OBJ_TYPE_TREE)
return got_error(GOT_ERR_OBJ_TYPE);
if (obj->flags & GOT_OBJ_FLAG_PACKED)
err = got_packfile_extract_object(&f, obj, repo);
else
err = open_loose_object(&f, obj, repo);
if (err)
return err;
err = read_tree_object(tree, repo, obj, f);
fclose(f);
return err;
}
void
got_object_tree_close(struct got_tree_object *tree)
{
struct got_tree_entry *te;
while (!SIMPLEQ_EMPTY(&tree->entries)) {
te = SIMPLEQ_FIRST(&tree->entries);
SIMPLEQ_REMOVE_HEAD(&tree->entries, entry);
tree_entry_close(te);
}
free(tree);
}
const struct got_error *
got_object_blob_open(struct got_blob_object **blob,
struct got_repository *repo, struct got_object *obj, size_t blocksize)
{
const struct got_error *err = NULL;
if (obj->type != GOT_OBJ_TYPE_BLOB)
return got_error(GOT_ERR_OBJ_TYPE);
if (blocksize < obj->hdrlen)
return got_error(GOT_ERR_NO_SPACE);
*blob = calloc(1, sizeof(**blob));
if (*blob == NULL)
return got_error(GOT_ERR_NO_MEM);
if (obj->flags & GOT_OBJ_FLAG_PACKED) {
(*blob)->read_buf = calloc(1, blocksize);
if ((*blob)->read_buf == NULL)
return got_error(GOT_ERR_NO_MEM);
err = got_packfile_extract_object(&((*blob)->f), obj, repo);
if (err)
return err;
} else {
err = open_loose_object(&((*blob)->f), obj, repo);
if (err) {
free(*blob);
return err;
}
err = got_inflate_init(&(*blob)->zb, blocksize);
if (err != NULL) {
fclose((*blob)->f);
free(*blob);
return err;
}
(*blob)->read_buf = (*blob)->zb.outbuf;
(*blob)->flags |= GOT_BLOB_F_COMPRESSED;
}
(*blob)->hdrlen = obj->hdrlen;
(*blob)->blocksize = blocksize;
memcpy(&(*blob)->id.sha1, obj->id.sha1, SHA1_DIGEST_LENGTH);
return err;
}
void
got_object_blob_close(struct got_blob_object *blob)
{
if (blob->flags & GOT_BLOB_F_COMPRESSED)
got_inflate_end(&blob->zb);
else
free(blob->read_buf);
fclose(blob->f);
free(blob);
}
char *
got_object_blob_id_str(struct got_blob_object *blob, char *buf, size_t size)
{
return got_sha1_digest_to_str(blob->id.sha1, buf, size);
}
size_t
got_object_blob_get_hdrlen(struct got_blob_object *blob)
{
return blob->hdrlen;
}
const uint8_t *
got_object_blob_get_read_buf(struct got_blob_object *blob)
{
return blob->read_buf;
}
const struct got_error *
got_object_blob_read_block(size_t *outlenp, struct got_blob_object *blob)
{
size_t n;
if (blob->flags & GOT_BLOB_F_COMPRESSED)
return got_inflate_read(&blob->zb, blob->f, outlenp);
n = fread(blob->read_buf, 1, blob->blocksize, blob->f);
if (n == 0 && ferror(blob->f))
return got_ferror(blob->f, GOT_ERR_IO);
*outlenp = n;
return NULL;
}
