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main.c
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#include "readelf.h"
#include "ppptra.h"
#include "disas.h"
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
static void invalid(void){
fprintf(stderr, "Invalid argument! use -h for help~\n");
}
static void usage(void)
{
fprintf(stderr,
"ppptra usage:\n"
" ./ppptra executable-file [args]\n"
"how to debug:\n"
" r -E Display the ELF file header\n"
" r -S Display the sections' header\n"
" r -S all Display all sections details\n"
" r -S [sectionName] Display the section details\n"
" r -P Display the program headers\n"
" r s Display the stack 10 lines\n"
" r s [num] Display the stack num lines\n"
" r r Display the value of all registers\n"
" x @[address] Display the value of the address\n"
" disas [funcName or @address] Disassemble the code\n"
" b [funcName or @address] Set a breakpoint at here\n"
" c Continue running\n"
" s Step into\n"
" n Single step\n"
" finish Exit this function\n"
" set [register_name] [value] Modify the value of the register\n"
" set @[address] [value] Modify the value of the address\n");
}
long get_true_bpaddr(char * str)
{
long addr;
if(*str == '@'){
addr = strtol(str+1, NULL, 16);
return addr;
}
return (long)get_addr_bysym(str);
}
int print_s_got()
{
printf("\n<SECTION .got>\n");
if(get_shdr_byname(".got")!=NULL){
Elf32_Shdr* shdr = get_shdr_byname(".got");
void* addr = (void*)shdr->sh_addr;
int num = shdr->sh_size/4;
for(int i=0;i<num;i++){
long data = ptrace(PTRACE_PEEKTEXT, child_pid, addr, NULL);
printf("GOT[%d] 0x%08lx: 0x%08lx\n", i, (long)addr, data);
addr += 4;
}
}
if(get_shdr_byname(".got.plt")!=NULL){
Elf32_Shdr* shdr1 = get_shdr_byname(".got.plt");
void* addr1 = (void*)shdr1->sh_addr;
int num1 = shdr1->sh_size/4;
for(int i=0;i<num1;i++){
long data1 = ptrace(PTRACE_PEEKTEXT, child_pid, addr1, NULL);
printf("GOT.PLT[%d] 0x%08lx: 0x%08lx\n", i, (long)addr1, data1);
addr1 += 4;
}
}
return 0;
}
int main(int argc, char *argv[]) {
if (argv[1]==NULL) {
usage();
exit(0);
}
char* filename = argv[1];
if(strcmp(filename,"-h")==0){
usage();
exit(0);
}
char c[50];
char c2[50]="\n";
char* op[3];
init_readelf(filename);
hang_up(filename);
pkill();
//print_ehdr();
//print_shdr();
//print_s_symtab();
//print_s_dynsym();
//print_s_text();
while (1) {
printf("\n\033[34m>\033[0m");
fgets(c, 50, stdin);
if(strcmp(c, "\n")==0){
strcpy(c, c2);
}
else{
int l = strlen(c);
c[l-1] = '\0';
strcpy(c2, c);
}
op[0] = strtok(c, " ");
op[1] = strtok(NULL, " ");
op[2] = strtok(NULL, " ");
if(strcmp("disas", op[0])==0){
//disas
if(op[2]!=NULL || op[1]==NULL){
invalid();usage();exit(0);
}
long bpaddr = get_true_bpaddr(op[1]);
if(bpaddr==0){
printf("%s\n", "invalid address");
}else{
print_all_func((void *)bpaddr);
}
}else if(strcmp("finish", op[0])==0){
//finish
}else if(strcmp("set", op[0])==0){
//set
if(op[2]==NULL || op[1]==NULL){
invalid();usage();exit(0);
}
if(*op[1] == '@'){
long addr = strtoul(op[1]+1, NULL, 16);
long val = strtoul(op[2], NULL, 16);
if(ptrace(PTRACE_POKETEXT, child_pid, addr, val)==-1){
printf("set value FAILED\n");
}else{
printf("%lx_%lx\n", addr, val);
printf("set value SUCCESS\n");
}
}else{
ptrace(PTRACE_GETREGS, child_pid, NULL, ®s);
if(strcmp(op[1],"eip")==0){
regs.eip = strtol(op[2], NULL, 16);
}else if(strcmp(op[1],"esp")==0){
regs.esp = strtol(op[2], NULL, 16);
}else if(strcmp(op[1],"eax")==0){
regs.eax = strtol(op[2], NULL, 16);
}else if(strcmp(op[1],"ebx")==0){
regs.ebx = strtol(op[2], NULL, 16);
}else if(strcmp(op[1],"ecx")==0){
regs.ecx = strtol(op[2], NULL, 16);
}else if(strcmp(op[1],"edx")==0){
regs.edx = strtol(op[2], NULL, 16);
}else if(strcmp(op[1],"esi")==0){
regs.esi = strtol(op[2], NULL, 16);
}else if(strcmp(op[1],"edi")==0){
regs.edi = strtol(op[2], NULL, 16);
}else if(strcmp(op[1],"ebp")==0){
regs.ebp = strtol(op[2], NULL, 16);
}else{
printf("set FAILED\n");
}
ptrace(PTRACE_SETREGS, child_pid, NULL, ®s);
}
}else switch (* op[0]) {
case 'q':
if(op[1]!=NULL){
invalid();usage();exit(0);
}
exit(0);
case 'b':
if(op[2]!=NULL || op[1]==NULL){
invalid();usage();exit(0);
}
long bpaddr = get_true_bpaddr(op[1]);
if(bpaddr==0){
printf("%s\n", "invalid breakpoint");
break;
}
bp(bpaddr);
break;
case 'c':
if(op[1]!=NULL){
invalid();usage();exit(0);
}
contn();break;
case 's':
if(op[1]!=NULL){
invalid();usage();exit(0);
}
next_step();break;
case 'n':
break;
case 'x':
if(op[2]!=NULL || op[1]==NULL){
invalid();usage();exit(0);
}
long addr = get_true_bpaddr(op[1]);
if(addr==0){
printf("%s\n", "invalid address");
break;
}
long data = ptrace(PTRACE_PEEKTEXT, child_pid, addr, NULL);
printf("[%lx~%lx]: %08lx\n", addr+4, addr, data);
break;
case 'r':
if(op[1]==NULL){
printf("no such a command\n");
break;
}
//r -E
if(strcmp(op[1], "-E")==0 && op[2]==NULL){
print_ehdr();
break;
}
//r -S
else if(strcmp(op[1], "-S")==0){
if(op[2]==NULL){
print_shdr();
break;
}else if(strcmp(op[2],".text")==0){
print_s_text();
break;
}else if(strcmp(op[2],".symtab")==0){
print_s_symtab();
break;
}else if(strcmp(op[2],".dynsym")==0){
print_s_dynsym();
break;
}else if(strcmp(op[2],".plt")==0){
print_s_plt();
break;
}else if(strcmp(op[2],".got")==0){
print_s_got();
break;
}else if(strcmp(op[2],".interp")==0){
print_s_interp();
break;
}else if(strcmp(op[2],".rel")==0){
print_s_rel();
break;
}else if(strcmp(op[2],".dynamic")==0){
print_s_dynamic();
break;
}else if(strcmp(op[2],"all")==0){
print_s_text();
print_s_symtab();
print_s_dynsym();
print_s_plt();
print_s_got();
print_s_interp();
print_s_rel();
print_s_dynamic();
break;
}
}
//r -P
else if(strcmp(op[1], "-P")==0 && op[2]==NULL){
}
//r r
else if(strcmp(op[1], "r")==0 && op[2]==NULL){
ptrace(PTRACE_GETREGS, child_pid, NULL, ®s);
printf("eip : %08lx\n", regs.eip);
printf("eax : %08lx\n", regs.eax);
printf("ebx : %08lx\n", regs.ebx);
printf("ecx : %08lx\n", regs.ecx);
printf("edx : %08lx\n", regs.edx);
printf("esi : %08lx\n", regs.esi);
printf("edi : %08lx\n", regs.edi);
printf("esp : %08lx\n", regs.esp);
printf("ebp : %08lx\n", regs.ebp);
}
else if(strcmp(op[1], "s")==0 && op[2]==NULL){
ptrace(PTRACE_GETREGS, child_pid, NULL, ®s);
for(int i=0;i<10;i++){
printf("0x%08lx = %08lx\n", regs.esp+i*4, ptrace(PTRACE_PEEKTEXT, child_pid, regs.esp+i*4, NULL));
}
}
else if(strcmp(op[1], "s")==0 && op[2]!=NULL){
int num = strtol(op[2], NULL, 10);
ptrace(PTRACE_GETREGS, child_pid, NULL, ®s);
for(int i=0;i<num;i++){
printf("0x%08lx = %08lx\n", regs.esp+i*4, ptrace(PTRACE_PEEKTEXT, child_pid, regs.esp+i*4, NULL));
}
}
break;
//no such a command
default:printf("no such a command\n");
}
}
return 0;
}