X-Git-Url: https://tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Futils.c;h=fadfd05fd7d96946fe77a8118d45ca4a7b451efb;hp=773ad18b07f24020419828df5a5bfad88c37a61d;hb=c2dc3784f127ef6db6e9960a4abecc1aab6f4e31;hpb=d917c8cb6b69475d568ccbe82389b9f2b3eb5e80 diff --git a/src/utils.c b/src/utils.c index 773ad18b..fadfd05f 100644 --- a/src/utils.c +++ b/src/utils.c @@ -1,7 +1,7 @@ /* utils.c -- gathering of some stupid small functions Copyright (C) 1999-2005 Ivo Timmermans - 2000-2009 Guus Sliepen + 2000-2013 Guus Sliepen This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -18,13 +18,32 @@ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ +#include "logger.h" #include "system.h" - -#include "../src/logger.h" #include "utils.h" +#include "xalloc.h" static const char hexadecimals[] = "0123456789ABCDEF"; -static const char base64imals[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; +static const char base64_original[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; +static const char base64_urlsafe[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_"; +static const char base64_decode[256] = { + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, 62, -1, 63, + 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1, + -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, + 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, 63, + -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, + 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, +}; static int charhex2bin(char c) { if(isdigit(c)) @@ -33,27 +52,16 @@ static int charhex2bin(char c) { return toupper(c) - 'A' + 10; } -static int charb64decode(char c) { - if(c >= 'a') - return c - 'a' + 26; - else if(c >= 'A') - return c - 'A'; - else if(c >= '0') - return c - '0' + 52; - else if(c == '+') - return 62; - else - return 63; -} - -int hex2bin(const char *src, char *dst, int length) { +int hex2bin(const char *src, void *vdst, int length) { + char *dst = vdst; int i; for(i = 0; i < length && isxdigit(src[i * 2]) && isxdigit(src[i * 2 + 1]); i++) dst[i] = charhex2bin(src[i * 2]) * 16 + charhex2bin(src[i * 2 + 1]); return i; } -int bin2hex(const char *src, char *dst, int length) { +int bin2hex(const void *vsrc, char *dst, int length) { + const char *src = vsrc; for(int i = length - 1; i >= 0; i--) { dst[i * 2 + 1] = hexadecimals[(unsigned char) src[i] & 15]; dst[i * 2] = hexadecimals[(unsigned char) src[i] >> 4]; @@ -62,14 +70,16 @@ int bin2hex(const char *src, char *dst, int length) { return length * 2; } -int b64decode(const char *src, char *dst, int length) { +int b64decode(const char *src, void *dst, int length) { int i; uint32_t triplet = 0; unsigned char *udst = (unsigned char *)dst; - for(i = 0; i < length / 3 * 4 && src[i]; i++) { - triplet |= charb64decode(src[i]) << (6 * (i & 3)); + for(i = 0; i < length && src[i]; i++) { + triplet |= base64_decode[src[i] & 0xff] << (6 * (i & 3)); if((i & 3) == 3) { + if(triplet & 0xff000000U) + return 0; udst[0] = triplet & 0xff; triplet >>= 8; udst[1] = triplet & 0xff; triplet >>= 8; udst[2] = triplet; @@ -77,6 +87,8 @@ int b64decode(const char *src, char *dst, int length) { udst += 3; } } + if(triplet & 0xff000000U) + return 0; if((i & 3) == 3) { udst[0] = triplet & 0xff; triplet >>= 8; udst[1] = triplet & 0xff; @@ -89,7 +101,7 @@ int b64decode(const char *src, char *dst, int length) { } } -int b64encode(const char *src, char *dst, int length) { +static int b64encode_internal(const void *src, char *dst, int length, const char *alphabet) { uint32_t triplet; const unsigned char *usrc = (unsigned char *)src; int si = length / 3 * 3; @@ -98,18 +110,18 @@ int b64encode(const char *src, char *dst, int length) { switch(length % 3) { case 2: triplet = usrc[si] | usrc[si + 1] << 8; - dst[di] = base64imals[triplet & 63]; triplet >>= 6; - dst[di + 1] = base64imals[triplet & 63]; triplet >>= 6; - dst[di + 2] = base64imals[triplet]; + dst[di] = alphabet[triplet & 63]; triplet >>= 6; + dst[di + 1] = alphabet[triplet & 63]; triplet >>= 6; + dst[di + 2] = alphabet[triplet]; dst[di + 3] = 0; - length = di + 2; + length = di + 3; break; case 1: triplet = usrc[si]; - dst[di] = base64imals[triplet & 63]; triplet >>= 6; - dst[di + 1] = base64imals[triplet]; + dst[di] = alphabet[triplet & 63]; triplet >>= 6; + dst[di + 1] = alphabet[triplet]; dst[di + 2] = 0; - length = di + 1; + length = di + 2; break; default: dst[di] = 0; @@ -121,15 +133,23 @@ int b64encode(const char *src, char *dst, int length) { di -= 4; si -= 3; triplet = usrc[si] | usrc[si + 1] << 8 | usrc[si + 2] << 16; - dst[di] = base64imals[triplet & 63]; triplet >>= 6; - dst[di + 1] = base64imals[triplet & 63]; triplet >>= 6; - dst[di + 2] = base64imals[triplet & 63]; triplet >>= 6; - dst[di + 3] = base64imals[triplet]; + dst[di] = alphabet[triplet & 63]; triplet >>= 6; + dst[di + 1] = alphabet[triplet & 63]; triplet >>= 6; + dst[di + 2] = alphabet[triplet & 63]; triplet >>= 6; + dst[di + 3] = alphabet[triplet]; } return length; } +int b64encode(const void *src, char *dst, int length) { + return b64encode_internal(src, dst, length, base64_original); +} + +int b64encode_urlsafe(const void *src, char *dst, int length) { + return b64encode_internal(src, dst, length, base64_urlsafe); +} + #if defined(HAVE_MINGW) || defined(HAVE_CYGWIN) #ifdef HAVE_CYGWIN #include @@ -138,7 +158,7 @@ int b64encode(const char *src, char *dst, int length) { const char *winerror(int err) { static char buf[1024], *ptr; - ptr = buf + sprintf(buf, "(%d) ", err); + ptr = buf + snprintf(buf, sizeof buf, "(%d) ", err); if (!FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, NULL, err, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), ptr, sizeof(buf) - (ptr - buf), NULL)) { @@ -159,3 +179,70 @@ unsigned int bitfield_to_int(const void *bitfield, size_t size) { memcpy(&value, bitfield, size); return value; } + +bool check_id(const char *id) { + if(!id || !*id) + return false; + + for(; *id; id++) + if(!isalnum(*id) && *id != '_') + return false; + + return true; +} + +bool check_netname(const char *netname, bool strict) { + if(!netname || !*netname || *netname == '.') + return false; + + for(const char *c = netname; *c; c++) { + if(iscntrl(*c)) + return false; + if(*c == '/' || *c == '\\') + return false; + if(strict && strchr(" $%<>:`\"|?*", *c)) + return false; + } + + return true; +} + +/* Windows doesn't define HOST_NAME_MAX. */ +#ifndef HOST_NAME_MAX +#define HOST_NAME_MAX 255 +#endif + +char *replace_name(const char *name) { + char *ret_name; + + if (name[0] == '$') { + char *envname = getenv(name + 1); + char hostname[HOST_NAME_MAX+1]; + if (!envname) { + if (strcmp(name + 1, "HOST")) { + logger(DEBUG_ALWAYS, LOG_ERR, "Invalid Name: environment variable %s does not exist\n", name + 1); + return NULL; + } + if (gethostname(hostname, sizeof hostname) || !*hostname) { + logger(DEBUG_ALWAYS, LOG_ERR, "Could not get hostname: %s\n", sockstrerror(sockerrno)); + return NULL; + } + hostname[HOST_NAME_MAX] = 0; + envname = hostname; + } + ret_name = xstrdup(envname); + for (char *c = ret_name; *c; c++) + if (!isalnum(*c)) + *c = '_'; + } else { + ret_name = xstrdup(name); + } + + if (!check_id(ret_name)) { + logger(DEBUG_ALWAYS, LOG_ERR, "Invalid name for myself!"); + free(ret_name); + return NULL; + } + + return ret_name; +}