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Add c utility for reading confluent multipart images

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This commit is contained in:
Jarrod Johnson 2021-07-15 12:39:19 -04:00
parent 46c0852b6f
commit 1570d3dbe3
1 changed files with 70 additions and 0 deletions
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confluent_osdeploy/utils/confluent_imginfo.c Normal file
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#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
int read_part(FILE* img, long int imgsize) {
char mountpath[65537];
char devpath[65537];
char fstype[65537];
uint16_t shortlength;
uint32_t length;
uint64_t longlength;
fread(&shortlength, 2, 1, img);
shortlength = be16toh(shortlength);
fread(mountpath, 1, shortlength, img);
mountpath[shortlength] = 0;
fread(&length, 4, 1, img);
length = be32toh(length);
fseek(img, length, SEEK_CUR); // skip json section that we don't support
fread(&longlength, 8, 1, img); // minimum size in bytes
longlength = be64toh(longlength);
printf("%ld\t", longlength);
fread(&longlength, 8, 1, img); // default size in bytes
longlength = be64toh(longlength);
printf("%ld\t", longlength);
fread(&shortlength, 2, 1, img); // length of filesystem type
shortlength = be16toh(shortlength);
fread(fstype, 1, shortlength, img);
fstype[shortlength] = 0;
fread(&shortlength, 2, 1, img); // length of DEVICE
shortlength = be16toh(shortlength);
fread(devpath, 1, shortlength, img);
devpath[shortlength] = 0;
fread(&shortlength, 2, 1, img);
shortlength = be16toh(shortlength);
fseek(img, shortlength, SEEK_CUR); // Skip the padding
fread(&longlength, 8, 1, img);
longlength = be64toh(longlength);
printf("%ld\t", ftell(img) / 512);
printf("%ld\t", longlength / 512);
printf("%s\t%s\t%s\n", fstype, devpath, mountpath);
fseek(img, longlength, SEEK_CUR);
return (ftell(img) < imgsize);
}
int main(int argc, char* argv[]) {
FILE* img;
long int imgsize;
char buffer[20];
img = fopen(argv[1], "rb");
fseek(img, 0, SEEK_END);
imgsize = ftell(img);
fseek(img, 0, SEEK_SET);
if (fread(buffer, 1, 16, img) < 16) {
fprintf(stderr, "Unable to read header of image\n");
exit(1);
}
if ((memcmp(buffer, "hsqs", 4) == 0) || (memcmp(buffer, "sqsh", 4) == 0)) {
printf("Format: squashfs\n");
exit(0);
}
if (memcmp(buffer, "\x63\x7b\x9d\x26\xb7\xfd\x48\x30\x89\xf9\x11\xcf\x18\xfd\xff\xa1", 16) != 0) {
fprintf(stderr, "Unrecognized image format\n");
exit(1);
}
printf("Format: confluent_multisquash\nminsize\tdefsize\toffset\tsize\tfstype\torigdev\tmount\n");
fseek(img, 31, SEEK_SET);
while (read_part(img, imgsize));
}