Prints the address of args, env vars and stored eip, ebp of the main frame

getaddrs.c

/*
gcc -m32 -o getaddrs getaddrs.c
*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

void
p_data_string(char* string) {
	char *p_c;
	char c;
	for (p_c = string; *p_c != 0; p_c++) {
		c = *p_c;
		if (c == '\\') {
			printf("\\\\");
		} else if (c == '\n') {
			printf("\\n");
		} else if (c >= 32 && c < 127) {
			printf("%c", c);
		} else {
			printf("\\x%02hhx", c);
		}
	}
}

void
p_envs(char* envp[]) {
	char* value_p;

	printf("----[ENVS]----------------------------\n");
	for(; *envp != 0; envp++) {
		value_p = strstr(*envp, "=");
		if (value_p) value_p += 1;

		printf("[%8p]->[ %8p - %8p\t] : ", envp, *envp, value_p);
		p_data_string(*envp);
		printf("\n");
	}
}

void
p_args(int argc,char *argv[]) {
	int i;

	printf("----[ARGS]----------------------------\n");
	for(i = 0; i < argc; i++) {
		printf("ARGV[%02d] - [%8p]->[%8p] : ", i, (argv+i), *(argv+i));
		p_data_string(*(argv+i));
		printf("\n");
	}
}

int
main(int argc,char *argv[], char* envp[]) {
	/* print envs and args */
	p_envs(envp);
	p_args(argc, argv);

	printf("----[FRAME]---------------------------\n");
	register unsigned int* s_ebp asm("ebp");
	unsigned int* s_eip = s_ebp+1;

	printf("ARGV: %8p\n", argv);
	printf("EBP : %8p -> %8p\n", s_ebp, (void*)*s_ebp);
	printf("EIP : %8p -> %8p\n", s_eip, (void*)*s_eip);

	return 0;
}