[SR-Dev] git:janakj/kcore: Moving strcommon.[ch] from kamailio core to libkcore

Module: sip-router Branch: janakj/kcore Commit: b38ce3c5b7b3cbe36c75422cd9aff7760ccb66b6 URL: http://git.sip-router.org/cgi-bin/gitweb.cgi/sip-router/?a=commit;h=b38ce3c… Author: Jan Janak &lt;jan(a)iptel.org&gt; Committer: Jan Janak &lt;jan(a)iptel.org&gt; Date: Tue Mar 3 17:10:47 2009 +0100 Moving strcommon.[ch] from kamailio core to libkcore --- lib/kcore/strcommon.c | 369 +++++++++++++++++++++++++++++++++++++++++++++++++ lib/kcore/strcommon.h | 54 +++++++ 2 files changed, 423 insertions(+), 0 deletions(-) diff --git a/lib/kcore/strcommon.c b/lib/kcore/strcommon.c new file mode 100644 index 0000000..84c54bf --- /dev/null +++ b/lib/kcore/strcommon.c @@ -0,0 +1,369 @@ +/* + * $Id$ + * + * Copyright (C) 2007 voice-system.ro + * + * This file is part of Kamailio, a free SIP server. + * + * Kamailio is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version + * + * Kamailio 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 + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + + */ +/*! + * \file + * \brief Generic string handling functions + */ + +#include "../../ut.h" +#include "strcommon.h" + +/*! \brief + * add backslashes to special characters + */ +int escape_common(char *dst, char *src, int src_len) +{ + int i, j; + + if(dst==0 || src==0 || src_len<=0) + return 0; + j = 0; + for(i=0; i<src_len; i++) + { + switch(src[i]) + { + case '\'': + dst[j++] = '\\'; + dst[j++] = src[i]; + break; + case '"': + dst[j++] = '\\'; + dst[j++] = src[i]; + break; + case '\\': + dst[j++] = '\\'; + dst[j++] = src[i]; + break; + case '\0': + dst[j++] = '\\'; + dst[j++] = '0'; + break; + default: + dst[j++] = src[i]; + } + } + return j; +} + +/*! \brief + * remove backslashes to special characters + */ +int unescape_common(char *dst, char *src, int src_len) +{ + int i, j; + + if(dst==0 || src==0 || src_len<=0) + return 0; + j = 0; + i = 0; + while(i<src_len) + { + if(src[i]=='\\' && i+1<src_len) + { + switch(src[i+1]) + { + case '\'': + dst[j++] = '\''; + i++; + break; + case '"': + dst[j++] = '"'; + i++; + break; + case '\\': + dst[j++] = '\\'; + i++; + break; + case '0': + dst[j++] = '\0'; + i++; + break; + default: + dst[j++] = src[i]; + } + } else { + dst[j++] = src[i]; + } + i++; + } + return j; +} + +/*! \brief Compute MD5 checksum */ +void compute_md5(char *dst, char *src, int src_len) +{ + MD5_CTX context; + unsigned char digest[16]; + MD5Init (&context); + MD5Update (&context, src, src_len); + MD5Final (digest, &context); + string2hex(digest, 16, dst); +} + +/*! \brief Unscape all printable ASCII characters */ +int unescape_user(str *sin, str *sout) +{ + char *at, *p, c; + + if(sin==NULL || sout==NULL || sin->s==NULL || sout->s==NULL + || sin->len<0 || sout->len < sin->len+1) + return -1; + + at = sout->s; + p = sin->s; + while(p < sin->s+sin->len) + { + if (*p == '%') + { + p++; + switch (*p) + { + case '0': + case '1': + case '2': + case '3': + case '4': + case '5': + case '6': + case '7': + case '8': + case '9': + c = (*p - '0') << 4; + break; + case 'a': + case 'b': + case 'c': + case 'd': + case 'e': + case 'f': + c = (*p - 'a' + 10) << 4; + break; + case 'A': + case 'B': + case 'C': + case 'D': + case 'E': + case 'F': + c = (*p - 'A' + 10) << 4; + break; + default: + LM_ERR("invalid hex digit <%u>\n", (unsigned int)*p); + return -1; + } + p++; + switch (*p) + { + case '0': + case '1': + case '2': + case '3': + case '4': + case '5': + case '6': + case '7': + case '8': + case '9': + c = c + (*p - '0'); + break; + case 'a': + case 'b': + case 'c': + case 'd': + case 'e': + case 'f': + c = c + (*p - 'a' + 10); + break; + case 'A': + case 'B': + case 'C': + case 'D': + case 'E': + case 'F': + c = c + (*p - 'A' + 10); + break; + default: + LM_ERR("invalid hex digit <%u>\n", (unsigned int)*p); + return -1; + } + if ((c < 32) || (c > 126)) + { + LM_ERR("invalid escaped character <%u>\n", (unsigned int)c); + return -1; + } + *at++ = c; + } else { + *at++ = *p; + } + p++; + } + + *at = 0; + sout->len = at - sout->s; + + LM_DBG("unescaped string is <%s>\n", sout->s); + return 0; +} + +/*! \brief + * Escape all printable characters that are not valid in user + * part of request uri + * no_need_to_escape = unreserved | user-unreserved + * unreserved = aplhanum | mark + * mark = - | _ | . | ! | ~ | * | ' | ( | ) + * user-unreserved = & | = | + | $ | , | ; | ? | / + */ +int escape_user(str *sin, str *sout) +{ + + char *at, *p; + unsigned char x; + + if(sin==NULL || sout==NULL || sin->s==NULL || sout->s==NULL + || sin->len<0 || sout->len < 3*sin->len+1) + return -1; + + + at = sout->s; + p = sin->s; + while (p < sin->s+sin->len) + { + if (*p < 32 || *p > 126) + { + LM_ERR("invalid escaped character <%u>\n", (unsigned int)*p); + return -1; + } + if (isdigit((int)*p) || ((*p >= 'A') && (*p <= 'Z')) || + ((*p >= 'a') && (*p <= 'z'))) + { + *at = *p; + } else { + switch (*p) { + case '-': + case '_': + case '.': + case '!': + case '~': + case '*': + case '\'': + case '(': + case ')': + case '&': + case '=': + case '+': + case '$': + case ',': + case ';': + case '?': + *at = *p; + break; + default: + *at++ = '%'; + x = (*p) >> 4; + if (x < 10) + { + *at++ = x + '0'; + } else { + *at++ = x - 10 + 'a'; + } + x = (*p) & 0x0f; + if (x < 10) { + *at = x + '0'; + } else { + *at = x - 10 + 'a'; + } + } + } + at++; + p++; + } + *at = 0; + sout->len = at - sout->s; + LM_DBG("escaped string is <%s>\n", sout->s); + return 0; +} + + +int unescape_param(str *sin, str *sout) +{ + return unescape_user(sin, sout); +} + + +/*! \brief + * Escape all printable characters that are not valid in + * a param part of request uri: = | ; | , | | " | ? | & + */ +int escape_param(str *sin, str *sout) +{ + char *at, *p; + unsigned char x; + + if (sin==NULL || sout==NULL || sin->s==NULL || sout->s==NULL || + sin->len<0 || sout->len < 3*sin->len+1) + return -1; + + at = sout->s; + p = sin->s; + while (p < sin->s+sin->len) { + if (*p < 32 || *p > 126) { + LM_ERR("invalid escaped character <%u>\n", (unsigned int)*p); + return -1; + } + switch (*p) { + case ' ': + case '?': + case '&': + case '=': + case ',': + case ';': + case '"': + case '+': + *at++ = '%'; + x = (*p) >> 4; + if (x < 10) + { + *at++ = x + '0'; + } else { + *at++ = x - 10 + 'a'; + } + x = (*p) & 0x0f; + if (x < 10) { + *at = x + '0'; + } else { + *at = x - 10 + 'a'; + } + break; + default: + *at = *p; + } + at++; + p++; + } + *at = 0; + sout->len = at - sout->s; + LM_DBG("escaped string is <%s>\n", sout->s); + + return 0; +} + diff --git a/lib/kcore/strcommon.h b/lib/kcore/strcommon.h new file mode 100644 index 0000000..8d7d61e --- /dev/null +++ b/lib/kcore/strcommon.h @@ -0,0 +1,54 @@ +/* + * $Id$ + * + * Copyright (C) 2007 voice-system.ro + * + * This file is part of Kamailio, a free SIP server. + * + * Kamailio is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version + * + * Kamailio 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 + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ +/*! + * \file + * \brief Common string handling functions + */ + +#ifndef _STRCOMMON_H_ +#define _STRCOMMON_H_ + +#include "../../str.h" +#include "../../md5.h" + +/* + * add backslashes to special characters + */ +int escape_common(char *dst, char *src, int src_len); +/* + * remove backslashes to special characters + */ +int unescape_common(char *dst, char *src, int src_len); + +void compute_md5(char *dst, char *src, int src_len); + +int escape_user(str *sin, str *sout); + +int unescape_user(str *sin, str *sout); + +int escape_param(str *sin, str *sout); + +int unescape_param(str *sin, str *sout); + +#endif +