Attachment 836 Details for Bug 2147 – dumb program, used to extract names from the packet

dumb program, used to extract names from the packet

extract_name.c (text/plain), 3.28 KB, created by Timur Bakeyev on 2004-12-10 16:26:50 UTC

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Creator: Timur Bakeyev

Created: 2004-12-10 16:26:50 UTC

Size: 3.28 KB

patch

obsolete

>#include <stdio.h>
>#include <string.h>
>#include <fcntl.h>
>#include <err.h>
>
>#include "byteorder.h"
>
>#define PSTRING_LEN 1024
>#define FSTRING_LEN 256
>
>#define uint16 unsigned short
>
>typedef char pstring[PSTRING_LEN];
>typedef char fstring[FSTRING_LEN];
>
>/* pointer difference macro */
>#define PTR_DIFF(p1,p2) ((unsigned int)(((const char *)(p1)) - (const char *)(p2)))
>
>/****************************************************************************
> Return the total storage length of a mangled name.
>****************************************************************************/
>
>int name_len(char *s1)
>{
>	/* NOTE: this argument _must_ be unsigned */
>	unsigned char *s = (unsigned char *)s1;
>	int len;
>
>	/* If the two high bits of the byte are set, return 2. */
>	if (0xC0 == (*s & 0xC0))
>		return(2);
>
>	/* Add up the length bytes. */
>	for (len = 1; (*s); s += (*s) + 1) {
>		len += *s + 1;
>		//SMB_ASSERT(len < 80);
>		if(len < 80) {
>		    fprintf(stderr, "Assert: len < 80; %d\n", len);
>		}
>	}
>
>	return(len);
>}
>
>/****************************************************************************
> Find a pointer to a netbios name.
>****************************************************************************/
>
>static char *name_ptr(char *buf,int ofs)
>{
>	unsigned char c = *(unsigned char *)(buf+ofs);
>
>	if ((c & 0xC0) == 0xC0) {
>		uint16 l = RSVAL(buf, ofs) & 0x3FFF;
>		fprintf(stderr, "name ptr to pos %d from %d is %s\n",l,ofs,buf+l);
>		return(buf + l);
>	} else {
>		return(buf+ofs);
>	}
>}  
>
>/****************************************************************************
> Interpret the weird netbios "name" into a unix fstring. Return the name type.
>****************************************************************************/
>
>static int name_interpret(char *in, fstring name)
>{
>	int ret;
>	int len = (*in++) / 2;
>	fstring out_string;
>	char *out = out_string;
>
>	*out=0;
>
>	if (len > 30 || len<1)
>		return(0);
>
>	while (len--) {
>		if (in[0] < 'A' || in[0] > 'P' || in[1] < 'A' || in[1] > 'P') {
>			*out = 0;
>			return(0);
>		}
>		*out = ((in[0]-'A')<<4) + (in[1]-'A');
>		in += 2;
>		out++;
>	}
>	ret = out[-1];
>	out[-1] = 0;
>
>#ifdef NETBIOS_SCOPE
>	/* Handle any scope names */
>	while(*in) {
>		*out++ = '.'; /* Scope names are separated by periods */
>		len = *(unsigned char *)in++;
>		StrnCpy(out, in, len);
>		out += len;
>		*out=0;
>		in += len;
>	}
>#endif
>	//pull_ascii_fstring(name, out_string);
>	strcpy(name, out_string);
>
>	return(ret);
>}
>
>/****************************************************************************
> Extract a netbios name from a buf (into a unix string) return name type.
>****************************************************************************/
>
>int name_extract(char *buf,int ofs, fstring name)
>{
>	char *p = name_ptr(buf,ofs);
>	int d = PTR_DIFF(p,buf+ofs);
>
>	name[0] = '\0';
>	if (d < -50 || d > 50)
>		return(0);
>	return(name_interpret(p,name));
>}
>
>int main(int argc, char *argv[]) {
>    int fd, len;
>    char buf[4096];
>    fstring name1, name2;
>    
>    *name1 = *name2 = 0;
>    
>    fd=open(argv[1], O_RDONLY);
>    if(fd < 0) {
>	err(1, "Failed to open the file");
>    }
>    read(fd, buf, sizeof(buf));
>    
>    close(fd);
>    
>    len = name_len(buf+4);
>    
>    printf("Len: %d\n", len);
>    
>    name_extract(buf,4,name1);
>    
>    printf("|%s|\n", name1);
>
>    name_extract(buf,4 + name_len(buf + 4),name2);
>
>    printf("|%s|\n", name2);
>
>}
>

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Attachments on bug 2147: 835 | 836