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util.c
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util.c
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/*
* graftcp
* Copyright (C) 2018, 2021 Hmgle <[email protected]>
*
* This program 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.
*
* This program 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.
*/
#include "graftcp.h"
struct socket_info *SOCKET_INFO_TAB = NULL;
void add_socket_info(struct socket_info *s)
{
HASH_ADD_INT(SOCKET_INFO_TAB, magic_fd, s);
}
void del_socket_info(struct socket_info *s)
{
HASH_DEL(SOCKET_INFO_TAB, s);
}
struct socket_info *find_socket_info(uint64_t magic_fd)
{
struct socket_info *s;
HASH_FIND_INT(SOCKET_INFO_TAB, &magic_fd, s);
return s;
}
struct proc_info *PROC_INFO_TAB = NULL;
void add_proc_info(struct proc_info *p)
{
HASH_ADD_INT(PROC_INFO_TAB, pid, p);
}
void del_proc_info(struct proc_info *p)
{
HASH_DEL(PROC_INFO_TAB, p);
}
struct proc_info *find_proc_info(pid_t pid)
{
struct proc_info *p;
HASH_FIND_INT(PROC_INFO_TAB, &pid, p);
return p;
}
struct proc_info *alloc_proc_info(pid_t pid)
{
struct proc_info *newp = calloc(1, sizeof(*newp));
newp->pid = pid;
add_proc_info(newp);
return newp;
}
#ifndef offsetof
#define offsetof(a, b) __builtin_offsetof(a,b)
#endif
#if defined(__arm64__) || defined(__aarch64__)
struct arm_pt_regs {
uint32_t uregs[18];
};
#define ARM_cpsr uregs[16]
#define ARM_pc uregs[15]
#define ARM_lr uregs[14]
#define ARM_sp uregs[13]
#define ARM_ip uregs[12]
#define ARM_fp uregs[11]
#define ARM_r10 uregs[10]
#define ARM_r9 uregs[9]
#define ARM_r8 uregs[8]
#define ARM_r7 uregs[7]
#define ARM_r6 uregs[6]
#define ARM_r5 uregs[5]
#define ARM_r4 uregs[4]
#define ARM_r3 uregs[3]
#define ARM_r2 uregs[2]
#define ARM_r1 uregs[1]
#define ARM_r0 uregs[0]
#define ARM_ORIG_r0 uregs[17]
static union {
struct user_pt_regs aarch64_r;
struct arm_pt_regs arm_r;
} arm_regs_union;
#endif
int get_syscall_number(pid_t pid)
{
#if defined(__x86_64__)
#if 1
errno = 0;
int offset = offsetof(struct user, regs.orig_rax);
long val = ptrace(PTRACE_PEEKUSER, pid, offset);
assert(errno == 0);
return (int)val;
#else /* another way */
struct user_regs_struct regs;
ptrace(PTRACE_GETREGS, pid, 0, ®s);
assert(errno == 0);
return regs.orig_rax;
#endif
#elif defined(__i386__)
struct user_regs_struct regs;
ptrace(PTRACE_GETREGS, pid, 0, ®s);
assert(errno == 0);
return regs.orig_eax;
#elif defined(__arm__)
errno = 0;
struct pt_regs regs;
ptrace(PTRACE_GETREGS, pid, 0, ®s);
assert(errno == 0);
return regs.ARM_r7;
#elif defined(__arm64__) || defined(__aarch64__)
struct iovec iov = {
.iov_base = &arm_regs_union,
.iov_len = sizeof(struct user_pt_regs)
};
ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &iov);
assert(errno == 0);
switch (iov.iov_len) {
case sizeof(struct user_pt_regs):
return arm_regs_union.aarch64_r.regs[8];
case sizeof(struct arm_pt_regs):
return arm_regs_union.arm_r.ARM_r7;
}
return -1;
#endif
}
int get_retval(pid_t pid)
{
#if defined(__x86_64__)
#if 1
errno = 0;
int offset = offsetof(struct user, regs.rax);
long val = ptrace(PTRACE_PEEKUSER, pid, offset);
return (int)val;
#else /* another way */
struct user_regs_struct regs;
ptrace(PTRACE_GETREGS, pid, 0, ®s);
return regs.rax;
#endif
#elif defined(__i386__)
errno = 0;
struct user_regs_struct regs;
ptrace(PTRACE_GETREGS, pid, 0, ®s);
return regs.eax;
#elif defined(__arm__)
errno = 0;
struct pt_regs regs;
ptrace(PTRACE_GETREGS, pid, 0, ®s);
return regs.ARM_r0;
#elif defined(__arm64__) || defined(__aarch64__)
struct iovec iov = {
.iov_base = &arm_regs_union,
.iov_len = sizeof(struct user_pt_regs)
};
ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &iov);
assert(errno == 0);
switch (iov.iov_len) {
case sizeof(struct user_pt_regs):
return arm_regs_union.aarch64_r.regs[0];
case sizeof(struct arm_pt_regs):
return arm_regs_union.arm_r.ARM_r0;
}
return -1;
#endif
}
void set_retval(pid_t pid, long new_val)
{
#if defined(__x86_64__)
struct user_regs_struct regs;
ptrace(PTRACE_GETREGS, pid, 0, ®s);
assert(errno == 0);
if ((long)regs.rax == new_val)
return;
regs.rax = new_val;
ptrace(PTRACE_SETREGS, pid, 0, ®s);
assert(errno == 0);
#elif defined(__i386__)
struct user_regs_struct regs;
ptrace(PTRACE_GETREGS, pid, 0, ®s);
assert(errno == 0);
if ((long)regs.eax == new_val)
return;
regs.eax = new_val;
ptrace(PTRACE_SETREGS, pid, 0, ®s);
assert(errno == 0);
#elif defined(__arm__)
struct pt_regs regs;
ptrace(PTRACE_GETREGS, pid, 0, ®s);
assert(errno == 0);
if ((long)regs.ARM_r0 == new_val)
return;
regs.ARM_r0 = new_val;
ptrace(PTRACE_SETREGS, pid, 0, ®s);
assert(errno == 0);
#elif defined(__arm64__) || defined(__aarch64__)
struct iovec iov = {
.iov_base = &arm_regs_union,
.iov_len = sizeof(struct user_pt_regs)
};
ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &iov);
assert(errno == 0);
switch (iov.iov_len) {
case sizeof(struct user_pt_regs):
arm_regs_union.aarch64_r.regs[0] = new_val;
case sizeof(struct arm_pt_regs):
arm_regs_union.arm_r.ARM_r0 = new_val;
}
ptrace(PTRACE_SETREGSET, pid, NT_PRSTATUS, &iov);
assert(errno == 0);
#endif
}
long get_syscall_arg(pid_t pid, int order)
{
long val;
#if defined(__x86_64__)
int offset;
switch (order) {
case 0:
offset = offsetof(struct user, regs.rdi);
break;
case 1:
offset = offsetof(struct user, regs.rsi);
break;
case 2:
offset = offsetof(struct user, regs.rdx);
break;
case 3:
offset = offsetof(struct user, regs.r10);
break;
case 4:
offset = offsetof(struct user, regs.r8);
break;
case 5:
offset = offsetof(struct user, regs.r9);
break;
default:
return -1;
}
errno = 0;
val = ptrace(PTRACE_PEEKUSER, pid, offset);
assert(errno == 0);
#elif defined(__i386__)
struct user_regs_struct regs;
ptrace(PTRACE_GETREGS, pid, 0, ®s);
switch (order) {
case 0:
val = regs.ebx;
break;
case 1:
val = regs.ecx;
break;
case 2:
val = regs.edx;
break;
case 3:
val = regs.esi;
break;
case 4:
val = regs.edi;
break;
case 5:
val = regs.ebp;
break;
default:
return -1;
}
#elif defined(__arm__)
struct pt_regs regs;
ptrace(PTRACE_GETREGS, pid, 0, ®s);
switch (order) {
case 0:
val = regs.ARM_ORIG_r0;
break;
case 1:
val = regs.ARM_r1;
break;
case 2:
val = regs.ARM_r2;
break;
case 3:
val = regs.ARM_r3;
break;
case 4:
val = regs.ARM_r4;
break;
case 5:
val = regs.ARM_r5;
break;
default:
return -1;
}
#elif defined(__arm64__) || defined(__aarch64__)
switch (order) {
case 0:
val = arm_regs_union.aarch64_r.regs[0];
break;
case 1:
val = arm_regs_union.aarch64_r.regs[1];
break;
case 2:
val = arm_regs_union.aarch64_r.regs[2];
break;
case 3:
val = arm_regs_union.aarch64_r.regs[3];
break;
case 4:
val = arm_regs_union.aarch64_r.regs[4];
break;
case 5:
val = arm_regs_union.aarch64_r.regs[5];
break;
default:
return -1;
}
#endif
return val;
}
void getdata(pid_t child, long addr, char *dst, int len)
{
char *laddr;
int i, j;
union u {
long val;
char chars[sizeof(long)];
} data;
i = 0;
j = len / sizeof(long);
laddr = dst;
while (i < j) {
data.val = ptrace(PTRACE_PEEKDATA, child, addr + i * 8, NULL);
memcpy(laddr, data.chars, sizeof(long));
++i;
laddr += sizeof(long);
}
j = len % sizeof(long);
if (j != 0) {
data.val = ptrace(PTRACE_PEEKDATA, child, addr + i * 8, NULL);
memcpy(laddr, data.chars, j);
}
}
void putdata(pid_t child, long addr, char *src, int len)
{
char *laddr;
int i, j;
union u {
long val;
char chars[sizeof(long)];
} data;
i = 0;
j = len / sizeof(long);
laddr = src;
while (i < j) {
memcpy(data.chars, laddr, sizeof(long));
ptrace(PTRACE_POKEDATA, child, addr + i * 8, data.val);
++i;
laddr += sizeof(long);
}
j = len % sizeof(long);
if (j != 0) {
memcpy(data.chars, laddr, j);
ptrace(PTRACE_POKEDATA, child, addr + i * 8, data.val);
}
}