#include <getopt.h>
#include <unistd.h>
#include <string.h>
+#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/ioctl.h>
+#include <sys/mman.h>
+#include <unistd.h>
+#include <errno.h>
+#include <v3_ctrl.h>
#define MAX_FILES 256
+/*
struct file_info {
int size;
char filename[2048];
char id[256];
};
+*/
+
+/*
+
+ The Palacios cookie encodes "v3vee" followed by a
+ 3 byte version code. There are currently two versions:
+
+ \0\0\0 => original (no checksum)
+ \0\0\1 => checksum
+*/
+
+#define COOKIE "v3vee\0\0\0"
+#define COOKIE_LEN 8
+#define COOKIE_VERSION_OFFSET 5
+#define COOKIE_VERSION_LEN 3
+
+int version = 1; // default version is now 1
+
int num_files = 0;
struct file_info files[MAX_FILES];
int copy_file(int file_index, FILE * data_file);
void usage() {
- printf("Usage: build_vm <infile> [-o outfile]\n");
+ printf("Usage: build_vm <infile> [-v version] [-o outfile]\n");
}
int main(int argc, char ** argv) {
char * outfile = NULL;
char * infile = NULL;
-
memset((char *)files, 0, sizeof(files));
opterr = 0;
- while ((c = getopt(argc, argv, "ho:")) != -1) {
+ while ((c = getopt(argc, argv, "ho:v:")) != -1) {
switch (c) {
case 'o':
outfile = optarg;
break;
+ case 'v':
+ version = atoi(optarg);
+ break;
case 'h':
usage();
return 1;
return 1;
}
+ if (version != 0 && version != 1) {
+ printf("Only versions 0 and 1 are supported\n");
+ return 1;
+ }
+
infile = argv[optind];
}
+static int generate_file_hashes (char * filename,
+ unsigned long long hdr_offset,
+ int num_files) {
+ unsigned char * file_data;
+ unsigned char * out_data;
+ struct mem_file_hdr * hdrs = NULL;
+ int i, fd, out_fd;
+ struct stat st;
+
+ out_fd = open(filename, O_RDWR);
+ if (!out_fd) {
+ fprintf(stderr, "Couldn't open output file %s\n", filename);
+ return -1;
+ }
+ fstat(out_fd, &st);
+
+ /* mmap the out file, easy access to file headers */
+ if ((out_data = mmap(0,
+ st.st_size,
+ PROT_READ|PROT_WRITE,
+ MAP_SHARED,
+ out_fd,
+ 0)) == MAP_FAILED) {
+ fprintf(stderr, "Error mapping output file (%d)\n", errno);
+ return -1;
+ }
+
+ hdrs = (struct mem_file_hdr *)(out_data + hdr_offset);
+
+ /* mmap each file, then update it's hash */
+ for (i = 0; i < num_files; i++) {
+
+ fd = open(files[i].filename, O_RDONLY);
+ if (!fd) {
+ fprintf(stderr, "Error opening file %s\n",
+ files[i].filename);
+ return -1;
+ }
+
+ if ((file_data = mmap(0,
+ hdrs[i].file_size,
+ PROT_READ,
+ MAP_PRIVATE,
+ fd,
+ 0)) == MAP_FAILED) {
+ fprintf(stderr, "Could not mmap file for hashing\n");
+ return -1;
+ }
+
+ /* generate the hash and save it */
+ hdrs[i].file_hash = v3_hash_buffer(file_data, hdrs[i].file_size);
+ printf("Generating hash for file %s (hash=0x%lx)\n",
+ files[i].filename, hdrs[i].file_hash);
+
+ munmap(file_data, hdrs[i].file_size);
+ close(fd);
+ }
+
+ munmap(out_data, st.st_size);
+ return 0;
+}
+
+void gen_cookie(char *dest)
+{
+ memcpy(dest,COOKIE,COOKIE_LEN);
+ dest[COOKIE_VERSION_OFFSET] = (((unsigned)version) >> 16) & 0xff;
+ dest[COOKIE_VERSION_OFFSET+1] = (((unsigned)version) >> 8) & 0xff;
+ dest[COOKIE_VERSION_OFFSET+2] = (((unsigned)version) >> 0) & 0xff;
+}
+
+
int write_output(char * filename, ezxml_t cfg_output) {
FILE * data_file = fopen(filename, "w+");
char * new_cfg_str = ezxml_toxml(cfg_output);
int i = 0;
unsigned long long offset = 0;
unsigned long long file_cnt = num_files;
+ unsigned long long hdr_offset = 0;
+ char cookie[COOKIE_LEN];
- fwrite("v3vee\0\0\0", 8, 1, data_file);
- offset += 8;
+ gen_cookie(cookie);
+
+ fwrite(cookie, COOKIE_LEN, 1, data_file);
+ offset += COOKIE_LEN;
// printf("New config: \n%s\n", new_cfg_str);
fwrite(&file_cnt, 8, 1, data_file);
offset += 8;
- // each index entry is 16 bytes long plus end padding
- offset += (16 * num_files) + 8;
+ if (version==0) {
+ // for version 0, we simply have the file num, offset, size list
+ // each index entry is 16 bytes long plus end padding
+ offset += (16 * num_files) + 8;
+ } else if (version==1) {
+ // For a version 1, we have the file num, offset, size, and hash list
+ // We need to remember where this begins in the file, though...
+ hdr_offset = offset;
+
+ // each index entry is (16+sizeof(unsigned long)) bytes long plus end padding
+ offset += ((16 + sizeof(unsigned long)) * num_files) + 8;
+ }
+
for (i = 0; i < num_files; i++) {
fwrite(&i, 4, 1, data_file);
fwrite(&(files[i].size), 4, 1, data_file);
fwrite(&offset, 8, 1, data_file);
+ if (version==1) {
+ /* we can't generate the hash yet, zero for now */
+ fwrite(&zero, sizeof(unsigned long), 1, data_file);
+ }
+
offset += files[i].size;
}
}
+ fclose(data_file);
+ if (version==1) {
+ // We now will go back and place the hashes
+ if (generate_file_hashes(filename,
+ hdr_offset,
+ num_files) < 0) {
+ fprintf(stderr, "Error generating file hashes\n");
+ return -1;
+ }
+ }
- fclose(data_file);
return 0;
}
