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truss: decode sysctl names.

Browse Source 
Submitted by:	Pawel Biernacki
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D21688
This commit is contained in:
Konstantin Belousov 2019-09-18 16:15:05 +00:00
parent 230754ccca
commit 43ce0d902c
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=352488
2 changed files with 73 additions and 0 deletions
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1
usr.bin/truss/syscall.h
View File

@ -131,6 +131,7 @@ enum Argtype {
Sockprotocol,
Socktype,
Sysarch,
Sysctl,
Umtxop,
Waitoptions,
Whence,

72
usr.bin/truss/syscalls.c
View File

@ -51,6 +51,7 @@ __FBSDID("$FreeBSD$");
#include <sys/socket.h>
#define _WANT_FREEBSD11_STAT
#include <sys/stat.h>
#include <sys/sysctl.h>
#include <sys/time.h>
#include <sys/un.h>
#include <sys/wait.h>
@ -506,6 +507,12 @@ static struct syscall decoded_syscalls[] = {
.args = { { Name, 0 }, { Atfd, 1 }, { Name, 2 } } },
{ .name = "sysarch", .ret_type = 1, .nargs = 2,
.args = { { Sysarch, 0 }, { Ptr, 1 } } },
{ .name = "__sysctl", .ret_type = 1, .nargs = 6,
.args = { { Sysctl, 0 }, { Sizet, 1 }, { Ptr, 2 }, { Ptr, 3 },
{ Ptr, 4 }, { Sizet, 5 } } },
{ .name = "__sysctlbyname", .ret_type = 1, .nargs = 6,
.args = { { Name, 0 }, { Sizet, 1 }, { Ptr, 2 }, { Ptr, 3 },
{ Ptr, 4}, { Sizet, 5 } } },
{ .name = "thr_kill", .ret_type = 1, .nargs = 2,
.args = { { Long, 0 }, { Signal, 1 } } },
{ .name = "thr_self", .ret_type = 1, .nargs = 1,
@ -1551,6 +1558,15 @@ print_cmsgs(FILE *fp, pid_t pid, bool receive, struct msghdr *msghdr)
free(cmsgbuf);
}
static void
print_sysctl_oid(FILE *fp, int *oid, int len)
{
int i;
for (i = 0; i < len; i++)
fprintf(fp, ".%d", oid[i]);
}
/*
* Converts a syscall argument into a string. Said string is
* allocated via malloc(), so needs to be free()'d. sc is
@ -2267,6 +2283,62 @@ print_arg(struct syscall_args *sc, unsigned long *args, register_t *retval,
print_integer_arg(sysdecode_sysarch_number, fp,
args[sc->offset]);
break;
case Sysctl: {
char name[BUFSIZ];
int oid[CTL_MAXNAME + 2], qoid[CTL_MAXNAME + 2];
size_t i;
int len;
memset(name, 0, sizeof(name));
len = args[sc->offset + 1];
if (get_struct(pid, (void *)args[sc->offset], oid,
len * sizeof(oid[0])) != -1) {
fprintf(fp, "\"");
if (oid[0] == CTL_SYSCTL) {
fprintf(fp, "sysctl.");
switch (oid[1]) {
case CTL_SYSCTL_DEBUG:
fprintf(fp, "debug");
break;
case CTL_SYSCTL_NAME:
fprintf(fp, "name");
print_sysctl_oid(fp, oid + 2, len - 2);
break;
case CTL_SYSCTL_NEXT:
fprintf(fp, "next");
break;
case CTL_SYSCTL_NAME2OID:
fprintf(fp, "name2oid");
break;
case CTL_SYSCTL_OIDFMT:
fprintf(fp, "oidfmt");
print_sysctl_oid(fp, oid + 2, len - 2);
break;
case CTL_SYSCTL_OIDDESCR:
fprintf(fp, "oiddescr");
print_sysctl_oid(fp, oid + 2, len - 2);
break;
case CTL_SYSCTL_OIDLABEL:
fprintf(fp, "oidlabel");
print_sysctl_oid(fp, oid + 2, len - 2);
break;
default:
print_sysctl_oid(fp, oid + 1, len - 1);
}
} else {
qoid[0] = CTL_SYSCTL;
qoid[1] = CTL_SYSCTL_NAME;
memcpy(qoid + 2, oid, len * sizeof(int));
i = sizeof(name);
if (sysctl(qoid, len + 2, name, &i, 0, 0) == -1)
print_sysctl_oid(fp, qoid + 2, len);
else
fprintf(fp, "%s", name);
}
fprintf(fp, "\"");
}
break;
}
case PipeFds:
/*
* The pipe() system call in the kernel returns its