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f6f59a7cd7441dc88a0690ae726e41048308fdfd
nmap/nbase/nbase_str.c

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/***************************************************************************
* nbase_str.c -- string related functions in the nbase library. These *
* were written by fyodor@nmap.org . *
* *
***********************IMPORTANT NMAP LICENSE TERMS************************
* *
* The Nmap Security Scanner is (C) 1996-2013 Insecure.Com LLC. Nmap is *
* also a registered trademark of Insecure.Com LLC. This program is free *
* software; you may redistribute and/or modify it under the terms of the *
* GNU General Public License as published by the Free Software *
* Foundation; Version 2 ("GPL"), BUT ONLY WITH ALL OF THE CLARIFICATIONS *
* AND EXCEPTIONS DESCRIBED HEREIN. This guarantees your right to use, *
* modify, and redistribute this software under certain conditions. If *
* you wish to embed Nmap technology into proprietary software, we sell *
* alternative licenses (contact sales@nmap.com). Dozens of software *
* vendors already license Nmap technology such as host discovery, port *
* scanning, OS detection, version detection, and the Nmap Scripting *
* Engine. *
* *
* Note that the GPL places important restrictions on "derivative works", *
* yet it does not provide a detailed definition of that term. To avoid *
* misunderstandings, we interpret that term as broadly as copyright law *
* allows. For example, we consider an application to constitute a *
* derivative work for the purpose of this license if it does any of the *
* following with any software or content covered by this license *
* ("Covered Software"): *
* *
* o Integrates source code from Covered Software. *
* *
* o Reads or includes copyrighted data files, such as Nmap's nmap-os-db *
* or nmap-service-probes. *
* *
* o Is designed specifically to execute Covered Software and parse the *
* results (as opposed to typical shell or execution-menu apps, which will *
* execute anything you tell them to). *
* *
* o Includes Covered Software in a proprietary executable installer. The *
* installers produced by InstallShield are an example of this. Including *
* Nmap with other software in compressed or archival form does not *
* trigger this provision, provided appropriate open source decompression *
* or de-archiving software is widely available for no charge. For the *
* purposes of this license, an installer is considered to include Covered *
* Software even if it actually retrieves a copy of Covered Software from *
* another source during runtime (such as by downloading it from the *
* Internet). *
* *
* o Links (statically or dynamically) to a library which does any of the *
* above. *
* *
* o Executes a helper program, module, or script to do any of the above. *
* *
* This list is not exclusive, but is meant to clarify our interpretation *
* of derived works with some common examples. Other people may interpret *
* the plain GPL differently, so we consider this a special exception to *
* the GPL that we apply to Covered Software. Works which meet any of *
* these conditions must conform to all of the terms of this license, *
* particularly including the GPL Section 3 requirements of providing *
* source code and allowing free redistribution of the work as a whole. *
* *
* As another special exception to the GPL terms, Insecure.Com LLC grants *
* permission to link the code of this program with any version of the *
* OpenSSL library which is distributed under a license identical to that *
* listed in the included docs/licenses/OpenSSL.txt file, and distribute *
* linked combinations including the two. *
* *
* Any redistribution of Covered Software, including any derived works, *
* must obey and carry forward all of the terms of this license, including *
* obeying all GPL rules and restrictions. For example, source code of *
* the whole work must be provided and free redistribution must be *
* allowed. All GPL references to "this License", are to be treated as *
* including the terms and conditions of this license text as well. *
* *
* Because this license imposes special exceptions to the GPL, Covered *
* Work may not be combined (even as part of a larger work) with plain GPL *
* software. The terms, conditions, and exceptions of this license must *
* be included as well. This license is incompatible with some other open *
* source licenses as well. In some cases we can relicense portions of *
* Nmap or grant special permissions to use it in other open source *
* software. Please contact fyodor@nmap.org with any such requests. *
* Similarly, we don't incorporate incompatible open source software into *
* Covered Software without special permission from the copyright holders. *
* *
* If you have any questions about the licensing restrictions on using *
* Nmap in other works, are happy to help. As mentioned above, we also *
* offer alternative license to integrate Nmap into proprietary *
* applications and appliances. These contracts have been sold to dozens *
* of software vendors, and generally include a perpetual license as well *
* as providing for priority support and updates. They also fund the *
* continued development of Nmap. Please email sales@nmap.com for further *
* information. *
* *
* If you have received a written license agreement or contract for *
* Covered Software stating terms other than these, you may choose to use *
* and redistribute Covered Software under those terms instead of these. *
* *
* Source is provided to this software because we believe users have a *
* right to know exactly what a program is going to do before they run it. *
* This also allows you to audit the software for security holes. *
* *
* Source code also allows you to port Nmap to new platforms, fix bugs, *
* and add new features. You are highly encouraged to send your changes *
* to the dev@nmap.org mailing list for possible incorporation into the *
* main distribution. By sending these changes to Fyodor or one of the *
* Insecure.Org development mailing lists, or checking them into the Nmap *
* source code repository, it is understood (unless you specify otherwise) *
* that you are offering the Nmap Project (Insecure.Com LLC) the *
* unlimited, non-exclusive right to reuse, modify, and relicense the *
* code. Nmap will always be available Open Source, but this is important *
* because the inability to relicense code has caused devastating problems *
* for other Free Software projects (such as KDE and NASM). We also *
* occasionally relicense the code to third parties as discussed above. *
* If you wish to specify special license conditions of your *
* contributions, just say so when you send them. *
* *
* 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 Nmap *
* license file for more details (it's in a COPYING file included with *
* Nmap, and also available from https://svn.nmap.org/nmap/COPYING *
* *
***************************************************************************/
/* $Id$ */
#include "nbase.h"
#include <assert.h>
#include <string.h>
#include <stdarg.h>
#include <stdio.h>
#ifndef HAVE_STRCASESTR
char *strcasestr(const char *haystack, const char *pneedle) {
char buf[512];
unsigned int needlelen;
const char *p;
char *needle, *q, *foundto;
/* Should crash if !pneedle -- this is OK */
if (!*pneedle)
return (char *)haystack;
if (!haystack)
return NULL;
needlelen = (unsigned int)strlen(pneedle);
if (needlelen >= sizeof(buf))
needle = (char *)safe_malloc(needlelen + 1);
else
needle = buf;
p = pneedle;
q = needle;
while ((*q++ = tolower((int)(unsigned char)*p++)))
;
p = haystack - 1;
foundto = needle;
while (*++p) {
if (tolower((int)(unsigned char)*p) == *foundto) {
if (!*++foundto) {
/* Yeah, we found it */
if (needlelen >= sizeof(buf))
free(needle);
return (char *)(p - needlelen + 1);
}
} else
foundto = needle;
}
if (needlelen >= sizeof(buf))
free(needle);
return NULL;
}
#endif
int Strncpy(char *dest, const char *src, size_t n) {
strncpy(dest, src, n);
if (dest[n - 1] == '\0')
return 0;
dest[n - 1] = '\0';
return -1;
}
int Vsnprintf(char *s, size_t n, const char *fmt, va_list ap) {
int ret;
ret = vsnprintf(s, n, fmt, ap);
if (ret < 0 || (unsigned)ret >= n)
s[n - 1] = '\0';
return ret;
}
int Snprintf(char *s, size_t n, const char *fmt, ...) {
va_list ap;
int ret;
va_start(ap, fmt);
ret = Vsnprintf(s, n, fmt, ap);
va_end(ap);
return ret;
}
/* Make a new allocated null-terminated string from the bytes [start, end). */
char *mkstr(const char *start, const char *end) {
char *s;
assert(end >= start);
s = (char *)safe_malloc(end - start + 1);
memcpy(s, start, end - start);
s[end - start] = '\0';
return s;
}
/* vsprintf into a dynamically allocated buffer, similar to asprintf in
Glibc. Return the length of the buffer or -1 on error. */
int alloc_vsprintf(char **strp, const char *fmt, va_list va) {
va_list va_tmp;
char *s;
int size = 32;
int n;
s = NULL;
size = 32;
for (;;) {
s = (char *)safe_realloc(s, size);
#ifdef WIN32
va_tmp = va;
#else
va_copy(va_tmp, va);
#endif
n = vsnprintf(s, size, fmt, va_tmp);
if (n >= size)
size = n + 1;
else if (n < 0)
size = size * 2;
else
break;
}
*strp = s;
return n;
}
/* Used by escape_windows_command_arg to append a character to the given buffer
at a given position, resizing the buffer if necessary. The position gets
moved by one byte after the call. */
static char* safe_append_char(char* buf, char byte, unsigned int *rpos, unsigned int *rsize)
{
if (*rpos >= *rsize) {
*rsize += 512;
buf = (char*) safe_realloc(buf, *rsize);
}
buf[(*rpos)++] = byte;
return buf;
}
/* Escape a string so that it can be round-tripped into a command line string
and retrieved by the default C/C++ command line parser. You can escape a list
of strings with this function, join them with spaces, pass them to
CreateProcess, and the new process will get the same list of strings in its
argv array.
http://msdn.microsoft.com/en-us/library/17w5ykft%28v=vs.85%29.aspx
http://blogs.msdn.com/b/twistylittlepassagesallalike/archive/2011/04/23/everyone-quotes-arguments-the-wrong-way.aspx
Returns a dynamically allocated string.
This function has a test program in test/test-escape_windows_command_arg.c.
Run that program after making any changes. */
char *escape_windows_command_arg(const char *arg)
{
const char *p;
char *ret;
unsigned int rpos = 0, rsize = 1;
ret = (char *) safe_malloc(rsize);
ret = safe_append_char(ret, '"', &rpos, &rsize);
for (p = arg; *p != '\0'; p++) {
unsigned int num_backslashes;
unsigned int i;
num_backslashes = 0;
for (; *p == '\\'; p++)
num_backslashes++;
if (*p == '\0') {
/* Escape all backslashes, but let the terminating double quotation
mark we add below be interpreted as a metacharacter. */
for (i = 0; i < num_backslashes*2; i++)
ret = safe_append_char(ret, '\\', &rpos, &rsize);
break;
} else if (*p == '"') {
/* Escape all backslashes and the following double quotation
mark. */
for (i = 0; i < num_backslashes*2 + 1; i++)
ret = safe_append_char(ret, '\\', &rpos, &rsize);
ret[rpos++] = *p;
} else {
/* Backslashes aren't special here. */
for (i = 0; i < num_backslashes; i++)
ret = safe_append_char(ret, '\\', &rpos, &rsize);
ret = safe_append_char(ret, *p, &rpos, &rsize);
}
}
ret = safe_append_char(ret, '"', &rpos, &rsize);
ret = safe_append_char(ret, '\0', &rpos, &rsize);
return ret;
}
/* Convert non-printable characters to replchar in the string */
void replacenonprintable(char *str, int strlength, char replchar) {
int i;
for (i = 0; i < strlength; i++)
if (!isprint((int)(unsigned char)str[i]))
str[i] = replchar;
return;
}
/* Returns the position of the last directory separator (slash, also backslash
on Win32) in a path. Returns -1 if none was found. */
static int find_last_path_separator(const char *path) {
#ifndef WIN32
const char *PATH_SEPARATORS = "/";
#else
const char *PATH_SEPARATORS = "\\/";
#endif
const char *p;
p = path + strlen(path) - 1;
while (p >= path) {
if (strchr(PATH_SEPARATORS, *p) != NULL)
return (int)(p - path);
p--;
}
return -1;
}
/* Returns the directory name part of a path (everything up to the last
directory separator). If there is no separator, returns ".". If there is only
one separator and it is the first character, returns "/". Returns NULL on
error. The returned string must be freed. */
char *path_get_dirname(const char *path) {
char *result;
int i;
i = find_last_path_separator(path);
if (i == -1)
return strdup(".");
if (i == 0)
return strdup("/");
result = (char *)safe_malloc(i + 1);
strncpy(result, path, i);
result[i] = '\0';
return result;
}
/* Returns the file name part of a path (everything after the last directory
separator). Returns NULL on error. The returned string must be freed. */
char *path_get_basename(const char *path) {
int i;
i = find_last_path_separator(path);
return strdup(path + i + 1);
}
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