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/*
* Anonymise binary sa data files: rewrite sa files
* from users that are suitable for sharing/qa'ing.
*
* When sniffing out starting offsets of hostnames,
* something like this command can prove handy:
* dd if=rhel5-sa20.bin bs=1 skip=109 count=100
*/
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>
#define SA_UTSNAME_LEN 65
long
seek_magic_and_reposition_for_hostname(int fd)
{
int i;
unsigned short sa_magic;
struct magic {
unsigned short magic_offset;
/* check magic - not endian neutral in sa ... :| */
unsigned short numeric;
unsigned short swabbed;
/* fortunately, all same length so far (65 bytes) */
unsigned long utsname_offset;
} magic[] = {
{ 0, 0xd596, 0xd596, 89 }, /* sysstat-9.x & -10.x */
{ 40, 0x216e, 0x6e21, 113 }, /* sysstat-8.x */
{ 36, 0x2169, 0x6921, 109 }, /* sysstat-7.x */
};
for (i = 0; i < sizeof(magic) / sizeof(struct magic); i++) {
if ((lseek(fd, magic[i].magic_offset, SEEK_SET)) < 0) {
perror("lseek magic");
continue;
}
if (read(fd, &sa_magic, sizeof(sa_magic)) < 0) {
perror("read magic");
continue;
}
if (sa_magic == magic[i].numeric || sa_magic == magic[i].swabbed) {
if ((lseek(fd, magic[i].utsname_offset, SEEK_SET)) < 0) {
perror("hostname lseek");
return -1;
}
return magic[i].utsname_offset; /* all good */
}
}
printf(" non-sa data file - cannot find any sa magic - ignored\n");
return -1;
}
int main(int argc, char **argv)
{
int count, fixit = 0, updates = 0;
for (count = 1; count < argc; count++) {
char hostname[SA_UTSNAME_LEN] = { 0 };
char *file = argv[count];
int fd, bytes, length;
long offset;
if (strcmp(file, "-f") == 0) {
fixit = 1;
continue;
}
printf("Filename: %s\n", file);
if ((fd = open(file, O_RDWR)) < 0) {
perror("open");
continue;
}
if ((offset = seek_magic_and_reposition_for_hostname(fd)) < 0) {
close(fd);
continue;
}
if ((bytes = read(fd, hostname, sizeof(hostname))) < 0) {
perror("read");
close(fd);
continue;
}
hostname[sizeof(hostname)-1] = '\0';
length = strlen(hostname);
printf(" hostname: %s (%d bytes)\n", hostname, length);
if (fixit) {
memset(hostname, 0, length); // clear old name
strcpy(hostname, "pcp.qa.org"); // reset it
if ((lseek(fd, offset, SEEK_SET)) < 0) {
perror("lseek2");
close(fd);
continue;
}
if (write(fd, hostname, length) < 0) {
perror("write");
close(fd);
continue;
}
updates++;
}
close(fd);
}
printf("%d files scanned, %d files updated\n", count-1-fixit, updates);
return 0;
}
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