/*
* Get the linker file list from kldstat(8) output.
* The "run" flag tells if kldstat(8) should run now.
* Of course, kldstat(1) can run in a live system only, but its output
* can be saved beforehand and fed to this function later via stdin.
*/
void
asf_prog(int run)
{
char buf[LINE_MAX];
char *token[MAXTOKEN];
char *endp;
FILE *kldstat;
caddr_t base;
int tokens;
if (run) {
if ((kldstat = popen("kldstat", "r")) == NULL)
err(2, "can't start kldstat");
} else
kldstat = stdin;
while (fgets(buf, sizeof(buf), kldstat)) {
/* Skip header line and main kernel file */
if (buf[0] == 'I' || strstr(buf, KERNFILE))
continue;
tokens = tokenize(buf, token, MAXTOKEN);
if (tokens < 4)
continue;
base = (caddr_t)(uintptr_t)strtoumax(token[2], &endp, 16);
if (endp == NULL || *endp != '\0')
continue;
kfile_add(token[4], base);
}
}
/*
* Get the linker file list using the kld interface.
* Works with a live kernel only.
*/
void
asf_kld()
{
struct kld_file_stat kfs;
int fid = 0; /* indicates the beginning of the linker file list */
while ((fid = kldnext(fid)) != 0) {
if (fid == -1)
err(2, "kldnext");
kfs.version = sizeof(kfs); /* must be set for kldstat(2) */
/* Get info on this linker file */
if (kldstat(fid, &kfs) == -1)
err(2, "kldstat");
if (strcmp(kfs.name, KERNFILE) == 0)
continue;
/* Add to our list of linker files */
kfile_add(kfs.name, kfs.address);
}
}
/*
* Get the list of linker files using kvm(3).
* Can work with a live kernel as well as with a crash dump.
*/
void
asf_kvm(const char *kernfile, const char *corefile)
{
char errbuf[LINE_MAX];
char name[PATH_MAX];
kvm_t *kd;
struct nlist nl[2];
struct linker_file lf;
linker_file_list_t linker_files;
ssize_t n;
void *kp;
kd = kvm_openfiles(kernfile, corefile, NULL, O_RDONLY, errbuf);
if (kd == NULL)
errx(2, "open kernel memory: %s", errbuf);
/*
* Locate the head of the linker file list using kernel symbols.
*/
strcpy(name, LINKER_HEAD);
nl[0].n_name = name; /* can't use LINKER_HEAD here because it's const */
nl[1].n_name = NULL; /* terminate the array for kvm_nlist() */
switch (kvm_nlist(kd, nl)) {
case 0:
break;
case -1:
warnx("%s: %s", LINKER_HEAD, kvm_geterr(kd));
kvm_close(kd);
exit(2);
default:
kvm_close(kd);
errx(2, "%s: symbol not found", LINKER_HEAD);
}
/*
* Read the head of the linker file list from kernel memory.
*/
n = kvm_read(kd, nl[0].n_value, &linker_files, sizeof(linker_files));
if (n == -1)
goto read_err;
if (n != sizeof(linker_files)) {
kvm_close(kd);
errx(2, "%s: short read", LINKER_HEAD);
}
/*
* Traverse the linker file list starting at its head.
*/
for (kp = linker_files.tqh_first; kp; kp = lf.link.tqe_next) {
/* Read a linker file structure */
n = kvm_read(kd, (u_long)kp, &lf, sizeof(lf));
if (n == -1)
goto read_err;
if (n != sizeof(lf)) {
kvm_close(kd);
errx(2, "kvm: short read");
}
/* Read the name of the file stored separately */
bzero(name, sizeof(name));
n = kvm_read(kd, (u_long)lf.filename, name, sizeof(name) - 1);
if (n == -1)
goto read_err;
if (strcmp(name, KERNFILE) == 0)
continue;
/* Add this file to our list of linker files */
kfile_add(name, lf.address);
}
kvm_close(kd);
return;
read_err: /* A common error case */
warnx("read kernel memory: %s", kvm_geterr(kd));
kvm_close(kd);
exit(2);
}