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/* ptrace.c - Wrappers for the ptrace system call.
Copyright (C) 2017 Jakob Kreuze, All Rights Reserved.
This file is part of Hypodermic.
Hypodermic is free software: you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation, either version 3 of the License, or (at
your option) any later version.
Hypodermic is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with Hypodermic. If not, see <http://www.gnu.org/licenses/>. */
#include <sys/ptrace.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <stddef.h>
#include <unistd.h>
static void run_target(const char *path) {
if (ptrace(PTRACE_TRACEME, 0, NULL, NULL) < 0) {
return;
}
execl(path, path, 0);
}
int new_proc(const char *path) {
int wait_stat;
pid_t pid;
if (path == NULL) {
return -1;
}
pid = fork();
if (pid == 0) {
run_target(path);
} else if (pid > 0) {
wait(&wait_stat);
} else {
return -1;
}
return pid;
}
int attach(int pid) {
if ((ptrace(PTRACE_ATTACH, pid, NULL, NULL)) < 0) {
return -1;
}
waitpid(pid, NULL, WUNTRACED);
return 0;
}
int detach(int pid) {
return ptrace(PTRACE_DETACH, pid, NULL, NULL) < 0;
}
int cont(int pid) {
int s;
if ((ptrace(PTRACE_CONT, pid, NULL, NULL)) < 0) {
return -1;
}
while (!WIFSTOPPED(s)) {
waitpid(pid, &s, WNOHANG);
}
return 0;
}
/* user_regs_struct is copied from sys/user.h so that we can debug a
32-bit executable on a 64-bit platform. */
struct amd64_user_regs_struct {
__extension__ unsigned long long r15;
__extension__ unsigned long long r14;
__extension__ unsigned long long r13;
__extension__ unsigned long long r12;
__extension__ unsigned long long rbp;
__extension__ unsigned long long rbx;
__extension__ unsigned long long r11;
__extension__ unsigned long long r10;
__extension__ unsigned long long r9;
__extension__ unsigned long long r8;
__extension__ unsigned long long rax;
__extension__ unsigned long long rcx;
__extension__ unsigned long long rdx;
__extension__ unsigned long long rsi;
__extension__ unsigned long long rdi;
__extension__ unsigned long long orig_rax;
__extension__ unsigned long long rip;
__extension__ unsigned long long cs;
__extension__ unsigned long long eflags;
__extension__ unsigned long long rsp;
__extension__ unsigned long long ss;
__extension__ unsigned long long fs_base;
__extension__ unsigned long long gs_base;
__extension__ unsigned long long ds;
__extension__ unsigned long long es;
__extension__ unsigned long long fs;
__extension__ unsigned long long gs;
};
struct i386_user_regs_struct {
unsigned long ebx;
unsigned long ecx;
unsigned long edx;
unsigned long esi;
unsigned long edi;
unsigned long ebp;
unsigned long eax;
unsigned long xds;
unsigned long xes;
unsigned long xfs;
unsigned long xgs;
unsigned long orig_eax;
unsigned long eip;
unsigned long xcs;
unsigned long eflags;
unsigned long esp;
unsigned long xss;
};
unsigned long long getreg64(int pid, int idx) {
struct amd64_user_regs_struct regs;
ptrace(PTRACE_GETREGS, pid, NULL, ®s);
return ((unsigned long long *) ®s)[idx];
}
unsigned long getreg32(int pid, int idx) {
struct i386_user_regs_struct regs;
ptrace(PTRACE_GETREGS, pid, NULL, ®s);
return ((unsigned long *) ®s)[idx];
}
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