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abuild-tar: write checksum to extended header

This commit is contained in:
Timo Teräs 2014-11-01 17:09:13 +02:00
parent 18594ff66c
commit 248e9bb408
1 changed files with 157 additions and 44 deletions
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201
abuild-tar.c
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@ -1,6 +1,6 @@
/* abuild-tar.c - A TAR mangling utility for .APK packages
*
* Copyright (C) 2009 Timo Teräs <timo.teras@iki.fi>
* Copyright (C) 2009-2014 Timo Teräs <timo.teras@iki.fi>
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
@ -89,6 +89,19 @@ static void put_octal(char *s, size_t l, size_t value)
*(ptr--) = '0';
}
static void tarhdr_checksum(struct tar_header *hdr)
{
const unsigned char *src;
size_t chksum, i;
/* Recalculate checksum */
memset(hdr->chksum, ' ', sizeof(hdr->chksum));
src = (const unsigned char *) hdr;
for (i = chksum = 0; i < sizeof(*hdr); i++)
chksum += src[i];
put_octal(hdr->chksum, sizeof(hdr->chksum)-1, chksum);
}
static int usage(void)
{
fprintf(stderr,
@ -120,7 +133,7 @@ static ssize_t full_read(int fd, void *buf, size_t count)
} while (1);
if (total == 0 && n < 0)
return -1;
return -errno;
return total;
}
@ -142,7 +155,7 @@ static ssize_t full_write(int fd, const void *buf, size_t count)
} while (1);
if (total == 0 && n < 0)
return -1;
return -errno;
return total;
}
@ -163,82 +176,182 @@ static ssize_t full_splice(int from_fd, int to_fd, size_t count)
} while (1);
if (total == 0 && n < 0)
return -1;
return -errno;
return total;
}
static int do_it(const EVP_MD *md, int cut)
#define BUF_INITIALIZER {0}
struct buf {
char *ptr;
size_t size;
size_t alloc;
};
static void buf_free(struct buf *b)
{
free(b->ptr);
}
static int buf_resize(struct buf *b, size_t newsize)
{
struct tar_header hdr;
size_t size, aligned_size;
void *ptr;
int dohash = 0, r;
if (b->alloc >= newsize) return 0;
ptr = realloc(b->ptr, newsize);
if (!ptr) return -ENOMEM;
b->ptr = ptr;
b->alloc = newsize;
return 0;
}
static int buf_padto(struct buf *b, size_t alignment)
{
size_t oldsize, newsize;
oldsize = b->size;
newsize = (oldsize + alignment - 1) & -alignment;
if (buf_resize(b, newsize)) return -ENOMEM;
b->size = newsize;
memset(b->ptr + oldsize, 0, newsize - oldsize);
return 0;
}
static int buf_read_fd(struct buf *b, int fd, size_t size)
{
ssize_t r;
r = buf_resize(b, size);
if (r) return r;
r = full_read(fd, b->ptr, size);
if (r == size) {
b->size = r;
return 0;
}
b->size = 0;
if (r < 0) return r;
return -EIO;
}
static int buf_write_fd(struct buf *b, int fd)
{
ssize_t r;
r = full_write(fd, b->ptr, b->size);
if (r == b->size) return 0;
if (r < 0) return r;
return -ENOSPC;
}
static int buf_add_ext_header_hexdump(struct buf *b, const char *hdr, const char *value, int valuelen)
{
size_t oldsize = b->size;
int i, len;
/* "%u %s=%s\n" */
len = 1 + 1 + strlen(hdr) + 1 + valuelen*2 + 1;
for (i = len; i > 9; i /= 10) len++;
if (buf_resize(b, b->size + len)) return -ENOMEM;
b->size += snprintf(&b->ptr[b->size], len, "%u %s=", len, hdr);
for (i = 0; i < valuelen; i++)
b->size += snprintf(&b->ptr[b->size], 3, "%02x", (int)(unsigned char)value[i]);
b->ptr[b->size++] = '\n';
return 0;
}
static void add_legacy_checksum(struct tar_header *hdr, const EVP_MD *md, const char *digest)
{
struct {
char id[4];
uint16_t nid;
uint16_t size;
} mdinfo;
if (md != NULL) {
memcpy(mdinfo.id, "APK2", 4);
mdinfo.nid = EVP_MD_nid(md);
mdinfo.size = EVP_MD_size(md);
}
memcpy(mdinfo.id, "APK2", 4);
mdinfo.nid = EVP_MD_nid(md);
mdinfo.size = EVP_MD_size(md);
memcpy(&hdr->linkname[3], &mdinfo, sizeof(mdinfo));
memcpy(&hdr->linkname[3+sizeof(mdinfo)], digest, mdinfo.size);
tarhdr_checksum(hdr);
}
static int do_it(const EVP_MD *md, int cut)
{
char checksumhdr[32], digest[EVP_MAX_MD_SIZE];
struct buf data = BUF_INITIALIZER, pax = BUF_INITIALIZER;
struct tar_header hdr, paxhdr;
size_t size, aligned_size;
int dohash = 0, r, ret = 1;
if (md) snprintf(checksumhdr, sizeof(checksumhdr), "APK-TOOLS.checksum.%s", EVP_MD_name(md));
do {
if (full_read(STDIN_FILENO, &hdr, sizeof(hdr)) != sizeof(hdr))
return 0;
goto err;
if (cut && hdr.name[0] == 0)
return 0;
break;
size = GET_OCTAL(hdr.size);
aligned_size = (size + 511) & ~511;
if (md != NULL)
dohash = (hdr.typeflag == '0' || hdr.typeflag == '7');
if (dohash) {
const unsigned char *src;
int chksum, i;
ptr = malloc(aligned_size);
if (full_read(STDIN_FILENO, ptr, aligned_size) != aligned_size)
return 1;
memcpy(&hdr.linkname[3], &mdinfo, sizeof(mdinfo));
EVP_Digest(ptr, size, &hdr.linkname[3+sizeof(mdinfo)],
NULL, md, NULL);
/* Recalculate checksum */
memset(hdr.chksum, ' ', sizeof(hdr.chksum));
src = (const unsigned char *) &hdr;
for (i = chksum = 0; i < sizeof(hdr); i++)
chksum += src[i];
put_octal(hdr.chksum, sizeof(hdr.chksum)-1, chksum);
if (hdr.typeflag == 'x') {
memcpy(&paxhdr, &hdr, sizeof(hdr));
if (buf_read_fd(&pax, STDIN_FILENO, aligned_size)) goto err;
pax.size = size;
continue;
}
if (full_write(STDOUT_FILENO, &hdr, sizeof(hdr)) != sizeof(hdr))
return 2;
dohash = md && (hdr.typeflag == '0' || hdr.typeflag == '7' || hdr.typeflag == '2');
if (dohash) {
if (buf_read_fd(&data, STDIN_FILENO, aligned_size)) goto err;
if (hdr.typeflag != '2') {
EVP_Digest(data.ptr, size, digest, NULL, md, NULL);
add_legacy_checksum(&hdr, md, digest);
} else {
EVP_Digest(hdr.linkname, strlen(hdr.linkname), digest, NULL, md, NULL);
}
buf_add_ext_header_hexdump(&pax, checksumhdr, digest, EVP_MD_size(md));
PUT_OCTAL(paxhdr.size, pax.size);
tarhdr_checksum(&paxhdr);
}
if (pax.size) {
/* write pax header + content */
if (full_write(STDOUT_FILENO, &paxhdr, sizeof(paxhdr)) != sizeof(paxhdr) ||
buf_padto(&pax, 512) ||
buf_write_fd(&pax, STDOUT_FILENO)) goto err;
}
if (full_write(STDOUT_FILENO, &hdr, sizeof(hdr)) != sizeof(hdr)) goto err;
if (dohash) {
if (full_write(STDOUT_FILENO, ptr, aligned_size) != aligned_size)
return 2;
free(ptr);
if (buf_write_fd(&data, STDOUT_FILENO)) goto err;
} else if (aligned_size != 0) {
r = full_splice(STDIN_FILENO, STDOUT_FILENO, aligned_size);
if (r == -1) {
while (aligned_size > 0) {
if (full_read(STDIN_FILENO, &hdr, sizeof(hdr)) != sizeof(hdr))
return 1;
goto err;
if (full_write(STDOUT_FILENO, &hdr, sizeof(hdr)) != sizeof(hdr))
return 2;
goto err;
aligned_size -= sizeof(hdr);
}
} else if (r != aligned_size)
return 2;
} else if (r != aligned_size) goto err;
}
memset(&paxhdr, 0, sizeof(paxhdr));
pax.size = 0;
} while (1);
ret = 0;
err:
buf_free(&data);
buf_free(&pax);
return ret;
}
int main(int argc, char **argv)