/* * Copyright (C) 2010-2015 Mamadou DIOP. * * This file is part of Open Source Doubango Framework. * * DOUBANGO 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 3 of the License, or * (at your option) any later version. * * DOUBANGO 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 DOUBANGO. * */ /**@file tmedia_content_cpim.c * @brief Common Presence and Instant Messaging (CPIM): Message Format (RFC 3862) */ #include "tinymedia/content/tmedia_content_cpim.h" #include "tsk_debug.h" #include "tsk_memory.h" #include "tsk_string.h" #include "tsk_ragel_state.h" #include /* RFC 3862 - 2. Overall Message Structure A complete message looks something like this: m: Content-type: Message/CPIM s: h: (message-metadata-headers) s: e: (encapsulated MIME message-body) The end of the message body is defined by the framing mechanism of the protocol used. The tags 'm:', 's:', 'h:', 'e:', and 'x:' are not part of the message format and are used here to indicate the different parts of the message, thus: m: MIME headers for the overall message s: a blank separator line h: message headers e: encapsulated MIME object containing the message content x: MIME security multipart message wrapper */ /*********************************** * Ragel state machine. */ %%{ machine tmedia_machine_content_cpim; # Includes include tmedia_machine_utils "./ragel/tmedia_machine_utils.rl"; action tag{ tag_start = p; } action is_parsing_mime_headers{ parsing_mime_headers = tsk_true; } action is_parsing_message_headers{ parsing_mime_headers = tsk_false; } action parse_hname{ TSK_PARSER_SET_STRING(hname); } action parse_hvalue{ tmedia_content_header_t* header; TSK_PARSER_SET_STRING(hvalue); header = tmedia_content_header_create(hname, hvalue); TSK_FREE(hname); TSK_FREE(hvalue); if(parsing_mime_headers){ if(!TMEDIA_CONTENT_CPIM(self)->m_headers){ TMEDIA_CONTENT_CPIM(self)->m_headers = tsk_list_create(); } tsk_list_push_back_data(TMEDIA_CONTENT_CPIM(self)->m_headers, (void**)&header); } else{ if(!TMEDIA_CONTENT_CPIM(self)->h_headers){ TMEDIA_CONTENT_CPIM(self)->h_headers = tsk_list_create(); } tsk_list_push_back_data(TMEDIA_CONTENT_CPIM(self)->h_headers, (void**)&header); } } action parse_e{ int len = (int)(p - tag_start); if(len && tag_start){ if(TMEDIA_CONTENT_CPIM(self)->e){ TSK_OBJECT_SAFE_FREE(TMEDIA_CONTENT_CPIM(self)->e); \ } TMEDIA_CONTENT_CPIM(self)->e = tsk_buffer_create(tag_start, len); } } hname = token>tag %parse_hname; hvalue = any*>tag %parse_hvalue; Header = hname :>SP*:> ":" SP*<: hvalue :> CRLF; m = Header+ >is_parsing_mime_headers; s = CRLF; h = Header+ >is_parsing_message_headers; e = any*>tag %parse_e; # Entry point main := m s h s e; }%% static int tmedia_content_cpim_parse(tmedia_content_t* self, const void* in_data, tsk_size_t in_size) { int cs = 0; const char *p = in_data; const char *pe = p + in_size; const char *eof = pe; const char *tag_start = tsk_null; char* hname = tsk_null; char* hvalue = tsk_null; tsk_bool_t parsing_mime_headers = tsk_true; TSK_RAGEL_DISABLE_WARNINGS_BEGIN() %%write data; (void)(eof); (void)(tmedia_machine_content_cpim_first_final); (void)(tmedia_machine_content_cpim_error); (void)(tmedia_machine_content_cpim_en_main); %%write init; %%write exec; TSK_RAGEL_DISABLE_WARNINGS_END() TSK_FREE(hname); TSK_FREE(hvalue); if( cs < %%{ write first_final; }%% ){ TSK_DEBUG_ERROR("Failed to parse CPIM content"); return -1; } return 0; } static tsk_buffer_t* tmedia_content_cpim_get_data(tmedia_content_t* self) { tsk_buffer_t* data = tsk_buffer_create_null(); tmedia_content_cpim_t *cpim = TMEDIA_CONTENT_CPIM(self); const tsk_list_item_t* item; /* m: Content-type: Message/CPIM s: h: (message-metadata-headers) s: e: (encapsulated MIME message-body) x: MIME security multipart message wrapper */ if(cpim->m_headers){ tsk_list_foreach(item, cpim->m_headers){ char* hstring = tmedia_content_header_tostring(TMEDIA_CONTENT_HEADER(item->data)); tsk_buffer_append_2(data, TSK_LIST_IS_LAST(cpim->m_headers, item) ? "%s\r\n\r\n" : "%s\r\n", hstring); TSK_FREE(hstring); } } if(cpim->h_headers){ tsk_list_foreach(item, cpim->h_headers){ char* hstring = tmedia_content_header_tostring(TMEDIA_CONTENT_HEADER(item->data)); tsk_buffer_append_2(data, TSK_LIST_IS_LAST(cpim->h_headers, item) ? "%s\r\n\r\n" : "%s\r\n", hstring); TSK_FREE(hstring); } } if(cpim->e){ tsk_buffer_append(data, TSK_BUFFER_DATA(cpim->e), TSK_BUFFER_SIZE(cpim->e)); } if(cpim->x){ tsk_buffer_append(data, TSK_BUFFER_DATA(cpim->x), TSK_BUFFER_SIZE(cpim->x)); } return data; } //================================================================================================= // object/plugin definitions // /* constructor */ static tsk_object_t* tmedia_content_cpim_ctor(tsk_object_t * self, va_list * app) { tmedia_content_cpim_t *cpim = self; if(cpim){ /* init base: called by tmedia_content_create() */ /* init self */ } return self; } /* destructor */ static tsk_object_t* tmedia_content_cpim_dtor(tsk_object_t * self) { tmedia_content_cpim_t *cpim = self; if(cpim){ /* deinit base */ tmedia_content_deinit(TMEDIA_CONTENT(cpim)); /* deinit self */ TSK_OBJECT_SAFE_FREE(cpim->m_headers); TSK_OBJECT_SAFE_FREE(cpim->h_headers); TSK_OBJECT_SAFE_FREE(cpim->e); TSK_OBJECT_SAFE_FREE(cpim->x); } return self; } /* object definition */ static const tsk_object_def_t tmedia_content_cpim_def_s = { sizeof(tmedia_content_cpim_t), tmedia_content_cpim_ctor, tmedia_content_cpim_dtor, tsk_null, }; /* plugin definition*/ static const tmedia_content_plugin_def_t tmedia_content_cpim_plugin_def_s = { &tmedia_content_cpim_def_s, TMEDIA_CONTENT_CPIM_TYPE, tmedia_content_cpim_parse, tmedia_content_cpim_get_data }; const tmedia_content_plugin_def_t *tmedia_content_cpim_plugin_def_t = &tmedia_content_cpim_plugin_def_s;