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x25_utils.c
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x25_utils.c
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#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <ctype.h>
#include <arpa/inet.h>
#include "x25_utils.h"
// TODO: currently hardcoded to 10 bytes of output
// returns number of digits
int to_bcd(unsigned char *buf, char *str) {
int ret = 0;
memset(buf, 0, 10);
buf[0] = 0x36; // first byte must be 0x36, why?
unsigned char tmpbuf[10];
memset(tmpbuf, 0, 10);
int i = 0, len = strlen(str);
for (i = 0; i < len; i++) {
if (!isdigit(str[i])) continue;
unsigned char num = str[i] - '0';
tmpbuf[ret/2] |= num << (4 * !(ret%2));
ret++;
}
// reuse the var for encoded length
len = ret/2;
if (ret % 2) {
// odd number of digits
tmpbuf[ret/2] |= 0x0f;
len++;
}
for (i = 0; i < len; i++) {
buf[10-len+i] = tmpbuf[i];
}
return ret;
}
struct packet *login_packet(unsigned short sessid, char *hostname, char *username, char *password, char *newpassword, unsigned char reopen) {
char pwd[256] = "";
char npwd[256] = "";
strcpy(pwd, password);
if (newpassword) strcpy(npwd, newpassword);
char *idx = index(pwd, ' ');
if (idx) {
// the user wants to change the password (separated by space)
*idx = 0;
strcpy(npwd, idx+1);
}
struct packet *ret = packet_alloc();
ret->family = 0xf1;
ret->unk1 = 0xe0;
ret->dir = 0x04;
ret->pltype = 0x00;
ret->connid = 0;
ret->subseq = 0;
ret->unk2 = 0;
ret->sessid = sessid;
ret->tail = 0;
ret->data = block_alloc();
ret->data->id = 1;
ret->data->data = NULL;
ret->data->nchildren = 0;
unsigned char xxx[1024];
xxx[0] = 0x01;
block_addchild(ret->data, "1", xxx, 1);
*(unsigned short *)(xxx) = htons(0);
*(unsigned short *)(xxx+2) = htons(0); // job nr.
*(unsigned short *)(xxx+4) = htons(sessid);
*(unsigned short *)(xxx+6) = htons(0);
*(unsigned short *)(xxx+8) = htons(0);
block_addchild(ret->data, "2", xxx, 0x0a);
block_addchild(ret->data, "4-1", (unsigned char *)hostname, strlen(hostname));
memset(xxx, 0xff, 0x01b8);
block_addchild(ret->data, "4-3-1", xxx, 0x01b8);
memset(xxx, 0x00, 2);
block_addchild(ret->data, "4-3-2-1", xxx, 2);
block_addchild(ret->data, "4-3-2-2", (unsigned char *)username, strlen(username));
block_addchild(ret->data, "4-3-2-3", (unsigned char *)pwd, strlen(pwd));
if (strlen(npwd)) {
block_addchild(ret->data, "4-3-2-4", (unsigned char *)npwd, strlen(npwd));
}
xxx[0] = reopen;
block_addchild(ret->data, "4-3-2-5", xxx, 1);
return ret;
}
struct packet *logout_packet(unsigned short sessid) {
struct packet *ret = packet_alloc();
ret->family = 0xf1;
ret->unk1 = 0xe0;
ret->dir = 0x0e;
ret->pltype = 0x00;
ret->connid = 0;
ret->subseq = 0;
ret->unk2 = 0;
ret->sessid = sessid;
ret->tail = 0;
ret->data = block_alloc();
ret->data->id = 0x0b;
ret->data->data = NULL;
ret->data->nchildren = 0;
unsigned char xxx[1024];
xxx[0] = 0x04;
block_addchild(ret->data, "1", xxx, 1);
*(unsigned short *)(xxx) = htons(0);
*(unsigned short *)(xxx+2) = htons(0); // job nr.
*(unsigned short *)(xxx+4) = htons(sessid);
*(unsigned short *)(xxx+6) = htons(0);
*(unsigned short *)(xxx+8) = htons(0);
block_addchild(ret->data, "2", xxx, 0x0a);
return ret;
}
struct packet *command_packet(unsigned short sessid, char *c, int len) {
struct packet *ret = packet_alloc();
ret->family = 0xf1;
ret->unk1 = 0xe0;
ret->dir = 0x02;
ret->pltype = 0x00;
ret->connid = 0;
ret->subseq = 0;
ret->unk2 = 0;
ret->sessid = sessid;
ret->tail = 0;
ret->data = block_alloc();
ret->data->id = 4;
ret->data->data = NULL;
ret->data->nchildren = 0;
unsigned char xxx[1024];
xxx[0] = 0x04;
block_addchild(ret->data, "1", xxx, 1);
*(unsigned short *)(xxx) = htons(0);
*(unsigned short *)(xxx+2) = htons(0); // job nr.
*(unsigned short *)(xxx+4) = htons(0);
*(unsigned short *)(xxx+6) = htons(0);
xxx[8] = 0;
block_addchild(ret->data, "2", xxx, 0x09);
block_addchild(ret->data, "6-1", (unsigned char *)c, len);
return ret;
}
struct packet *command_confirmation_packet(unsigned short connid, unsigned short sessid, unsigned char tail, char *c, int len) {
struct packet *ret = packet_alloc();
ret->family = 0xf1;
ret->unk1 = 0xe0;
ret->dir = 0x03;
ret->pltype = 0x01;
ret->connid = connid;
ret->subseq = 0;
ret->unk2 = 0;
ret->sessid = sessid;
ret->tail = tail;
ret->data = block_alloc();
ret->data->id = 8;
ret->data->data = NULL;
ret->data->nchildren = 0;
unsigned char xxx[1024];
xxx[0] = 0x04;
block_addchild(ret->data, "1", xxx, 1);
*(unsigned short *)(xxx) = htons(0);
*(unsigned short *)(xxx+2) = htons(0);
*(unsigned short *)(xxx+4) = htons(0);
*(unsigned short *)(xxx+6) = htons(0);
*(unsigned short *)(xxx+8) = htons(0);
block_addchild(ret->data, "2", xxx, 0x0a);
block_addchild(ret->data, "6-1", (unsigned char *)c, len);
return ret;
}
struct packet *command_cancel_packet(unsigned short connid, unsigned short sessid, unsigned char tail, unsigned short jobnr) {
struct packet *ret = packet_alloc();
ret->family = 0xf1;
ret->unk1 = 0xe0;
ret->dir = 0x03;
ret->pltype = 0x01;
ret->connid = connid;
ret->subseq = 0;
ret->unk2 = 0;
ret->sessid = sessid;
ret->tail = tail;
ret->data = block_alloc();
ret->data->id = 0x0a;
ret->data->data = NULL;
ret->data->nchildren = 0;
unsigned char xxx[1024];
xxx[0] = 0x05;
block_addchild(ret->data, "1", xxx, 1);
*(unsigned short *)(xxx) = htons(0);
*(unsigned short *)(xxx+2) = htons(jobnr);
*(unsigned short *)(xxx+4) = htons(0);
*(unsigned short *)(xxx+6) = htons(0);
*(unsigned short *)(xxx+8) = htons(0);
block_addchild(ret->data, "2", xxx, 0x0a);
return ret;
}