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| version 1.73, 2016/07/26 15:22:36 | version 1.79, 2017/02/07 22:00:43 |
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| Line 1 | Line 1 |
| /** @file | /** @file |
| Parser: http support functions. | Parser: http support functions. |
| Copyright (c) 2001-2015 Art. Lebedev Studio (http://www.artlebedev.com) | Copyright (c) 2001-2017 Art. Lebedev Studio (http://www.artlebedev.com) |
| Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru) | Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru) |
| */ | */ |
| Line 47 volatile const char * IDENT_PA_HTTP_C="$ | Line 47 volatile const char * IDENT_PA_HTTP_C="$ |
| // helpers | // helpers |
| bool ResponseHeaders::add_header(const char *line){ | |
| const char *value=strchr(line, ':'); | |
| if(value && value != line){ // we need only headers, not the response code | |
| Header header(str_upper(line, value-line), String::Body(value+1).trim(String::TRIM_BOTH, " \t\n\r")); | |
| if(header.name == String::Body(HTTP_CONTENT_TYPE_UPPER) && content_type.is_empty()) | |
| content_type=header.value; | |
| if(header.name == String::Body("CONTENT-LENGTH") && content_length==0) | |
| content_length=pa_atoul(header.value.cstr(), 10); | |
| headers+=header; | |
| return true; | |
| } | |
| return false; | |
| } | |
| class Cookies_table_template_columns: public ArrayString { | class Cookies_table_template_columns: public ArrayString { |
| public: | public: |
| Cookies_table_template_columns() { | Cookies_table_template_columns() { |
| Line 76 static bool set_addr(struct sockaddr_in | Line 95 static bool set_addr(struct sockaddr_in |
| return false; | return false; |
| } | } |
| size_t guess_content_length(char* buf) { | class HTTP_response { |
| char* ptr; | public: |
| if((ptr=strstr(buf, "Content-Length:"))) // Apache | char *buf; |
| goto found; | size_t length; |
| if((ptr=strstr(buf, "content-length:"))) // Parser 3 before 3.4.0 | size_t buf_size; |
| goto found; | size_t body_offset; |
| if((ptr=strstr(buf, "Content-length:"))) // maybe 1 | |
| goto found; | |
| if((ptr=strstr(buf, "CONTENT-LENGTH:"))) // maybe 2 | |
| goto found; | |
| return 0; | |
| found: | |
| char *error_pos; | |
| size_t result=(size_t)strtol(ptr+15/*strlen("Content-Length:")*/, &error_pos, 0); | |
| const size_t reasonable_initial_max=0x400*0x400*10 /*10M*/; | |
| if(result>reasonable_initial_max) // sanity check | |
| return reasonable_initial_max; | |
| return 0;//result; | |
| } | |
| static int http_read_response(char*& response, size_t& response_size, int sock, bool fail_on_status_ne_200) { | ResponseHeaders headers; |
| int result=0; | String &url; |
| // fetching some to local buffer, guessing on possible Content-Length | |
| response_size=0x400*20; // initial size if Content-Length could not be determined | HTTP_response(String& aurl) : buf(NULL), length(0), buf_size(0), body_offset(0), url(aurl){} |
| const size_t preview_size=0x400*20; | |
| char preview_buf[preview_size+1/*terminator*/]; // 20K buffer to preview headers | |
| ssize_t received_size=recv(sock, preview_buf, preview_size, 0); | |
| if(received_size==0) | |
| goto done; | |
| if(received_size<0) { | |
| if(int no=pa_socks_errno()) | |
| throw Exception("http.timeout", 0, "error receiving response header: %s (%d)", pa_socks_strerr(no), no); | |
| goto done; | |
| } | |
| // terminator [helps futher string searches] | |
| preview_buf[received_size]=0; | |
| // checking status | |
| if(char* EOLat=strstr(preview_buf, "\n")) { | |
| const String status_line(pa_strdup(preview_buf, EOLat-preview_buf)); | |
| ArrayString astatus; | |
| size_t pos_after=0; | |
| status_line.split(astatus, pos_after, " "); | |
| const String& status_code=*astatus.get(astatus.count()>1?1:0); | |
| result=status_code.as_int(); | |
| if(fail_on_status_ne_200 && result!=200) | void resize(size_t size){ |
| throw Exception("http.status", &status_code, "invalid HTTP response status"); | buf_size=size; |
| buf=(char *)pa_realloc(buf, size + 1); | |
| } | } |
| // detecting response_size | |
| { | bool read(int sock, size_t size){ |
| if(size_t content_length=guess_content_length(preview_buf)) | if(length+size>buf_size) |
| response_size=preview_size+content_length; // a little more than needed, will adjust response_size by actual received size later | resize(buf_size*2 + size); |
| ssize_t received_size=recv(sock, buf + length, size, 0); | |
| if(received_size==0) | |
| return false; | |
| if(received_size<0) { | |
| if(int no=pa_socks_errno()) | |
| throw Exception("http.timeout", &url, "error receiving response body: %s (%d)", pa_socks_strerr(no), no); | |
| return false; | |
| } | |
| length+=received_size; | |
| buf[length]='\0'; | |
| return true; | |
| } | } |
| // [gcc is happier this way, see goto above] | size_t status_size(){ |
| { | char *headers=strchr(buf, '\n'); |
| // allocating initial buf | if(!headers) |
| response=(char*)pa_malloc_atomic(response_size+1/*terminator*/); // just setting memory block type | return false; |
| char* ptr=response; | |
| size_t todo_size=response_size; | return headers-buf; |
| // coping part of already received body | } |
| memcpy(ptr, preview_buf, received_size); | |
| ptr+=received_size; | const char *status_code(char *status_line, int &result){ |
| todo_size-=received_size; | char* status_start = strchr(status_line, ' '); |
| // we use terminator byte for two purposes here: | if(!(status_start++)) |
| // 1. we return there zero always, not knowing: maybe they would want to create String form $file.body? | return status_line; |
| // invariant: all Strings should have zero-terminated buffers | |
| // 2. we use that out-of-size byte to detect if our Content-Length guess was wrong | char* status_end=strchr(status_start, ' '); |
| // when recv gets more than we expected | |
| // a) we know that the Content-Length guess was wrong | if(!status_end) |
| // b) we have space to put the first byte of extra data | return status_line; |
| // c) we use less code to detect normal situation: on last while-cycle recv expected to just return 0 | |
| while(true) { | if(status_end==status_start) |
| received_size=recv(sock, ptr, todo_size+1/*there is always a place for terminator*/, 0); | return status_line; |
| if(received_size==0) { | |
| response_size-=todo_size; // in case we received less than expected, cut down the reported size | const char *result_str=pa_strdup(status_start, status_end-status_start); |
| result=atoi(result_str); | |
| return result_str; | |
| } | |
| bool body_start(){ | |
| char *p=buf; | |
| while((p=strchr(p, '\n'))) { | |
| if(p[1]=='\r' && p[2]=='\n'){ // \r\n\r\n | |
| *p='\0'; | |
| body_offset=p-buf+3; | |
| return true; | |
| } | |
| if(p[1]=='\n') { // \n\n | |
| *p='\0'; | |
| body_offset=p-buf+2; | |
| return true; | |
| } | |
| p++; | |
| } | |
| return false; | |
| } | |
| void parse_headers(){ | |
| const String header_block(buf, String::L_TAINTED); | |
| ArrayString aheaders; | |
| header_block.split(aheaders, 0, "\n"); | |
| Array_iterator<const String*> i(aheaders); | |
| i.next(); // skipping status | |
| for(;i.has_next();){ | |
| const char *line=i.next()->cstr(); | |
| if(!headers.add_header(line)) | |
| throw Exception("http.response", &url, "bad response from host - bad header \"%s\"", line); | |
| } | |
| } | |
| }; | |
| enum HTTP_response_state { | |
| HTTP_STATUS_CODE, | |
| HTTP_HEADERS, | |
| HTTP_BODY | |
| }; | |
| static int http_read_response(HTTP_response& response, int sock, bool fail_on_status_ne_200) { | |
| HTTP_response_state state=HTTP_STATUS_CODE; | |
| int result=0; | |
| size_t chunk_size=0x400*16; | |
| response.resize(2*chunk_size); | |
| while(response.read(sock, chunk_size)){ | |
| switch(state){ | |
| case HTTP_STATUS_CODE: { | |
| size_t status_size=response.status_size(); | |
| if(!status_size) | |
| break; | |
| const char *status=response.status_code(pa_strdup(response.buf, status_size), result); | |
| if(!result || fail_on_status_ne_200 && result!=200) | |
| throw Exception("http.status", status ? new String(status) : &String::Empty, "invalid HTTP response status"); | |
| state=HTTP_HEADERS; | |
| } | |
| case HTTP_HEADERS: { | |
| if(!response.body_start()) | |
| break; | |
| response.parse_headers(); | |
| size_t content_length=check_file_size(response.headers.content_length, response.url); | |
| if(content_length>0 && (content_length + response.body_offset) > response.length){ | |
| response.resize(content_length + response.body_offset + 0x400*64); | |
| } | |
| state=HTTP_BODY; | |
| break; | break; |
| } | } |
| if(received_size<0) { | |
| if(int no=pa_socks_errno()) | case HTTP_BODY: { |
| throw Exception("http.timeout", 0, "error receiving response body: %s (%d)", pa_socks_strerr(no), no); | chunk_size=0x400*64; |
| break; | break; |
| } | } |
| // they've touched the terminator? | |
| if((size_t)received_size>todo_size) | |
| { | |
| // that means that our guessed response_size was not big enough | |
| const size_t grow_chunk_size=0x400*0x400; // 1M | |
| response_size+=grow_chunk_size; | |
| size_t ptr_offset=ptr-response; | |
| response=(char*)pa_realloc(response, response_size+1/*terminator*/); | |
| ptr=response+ptr_offset; | |
| todo_size+=grow_chunk_size; | |
| } | |
| // can't do this before realloc: we need <todo_size check | |
| ptr+=received_size; | |
| todo_size-=received_size; | |
| } | } |
| } | } |
| done: | |
| if(result) | if(state==HTTP_STATUS_CODE) |
| { | throw Exception("http.response", &response.url, "bad response from host - no status found (size=%u)", response.length); |
| response[response_size]=0; | |
| return result; | if(state==HTTP_HEADERS){ |
| response.parse_headers(); | |
| response.body_offset=response.length; | |
| } | } |
| else | |
| throw Exception("http.response", 0, "bad response from host - no status found (size=%u)", response_size); | return result; |
| } | } |
| /* ********************** request *************************** */ | /* ********************** request *************************** */ |
| Line 200 static void timeout_handler(int /*sig*/) | Line 264 static void timeout_handler(int /*sig*/) |
| } | } |
| #endif | #endif |
| static int http_request(char*& response, size_t& response_size, | static int http_request(HTTP_response& response, const char* host, short port, const char* request, size_t request_size, int timeout_secs, bool fail_on_status_ne_200) { |
| const char* host, short port, | |
| const char* request, size_t request_size, | |
| int timeout_secs, | |
| bool fail_on_status_ne_200) { | |
| if(!host) | if(!host) |
| throw Exception("http.host", 0, "zero hostname"); //never | throw Exception("http.host", 0, "zero hostname"); //never |
| Line 253 static int http_request(char*& response, | Line 313 static int http_request(char*& response, |
| if(connect(sock, (struct sockaddr *)&dest, sizeof(dest))) { | if(connect(sock, (struct sockaddr *)&dest, sizeof(dest))) { |
| int no=pa_socks_errno(); | int no=pa_socks_errno(); |
| throw Exception("http.connect", 0, "can not connect to host \"%s\": %s (%d)", host, pa_socks_strerr(no), no); | throw Exception("http.connect", 0, "can not connect to host \"%s\": %s (%d)", host, pa_socks_strerr(no), no); |
| } | } |
| if(send(sock, request, request_size, 0)!=(ssize_t)request_size) { | if(send(sock, request, request_size, 0)!=(ssize_t)request_size) { |
| int no=pa_socks_errno(); | int no=pa_socks_errno(); |
| throw Exception("http.timeout", 0, "error sending request: %s (%d)", pa_socks_strerr(no), no); | throw Exception("http.timeout", 0, "error sending request: %s (%d)", pa_socks_strerr(no), no); |
| } | } |
| result=http_read_response(response, response_size, sock, fail_on_status_ne_200); | result=http_read_response(response, sock, fail_on_status_ne_200); |
| closesocket(sock); | closesocket(sock); |
| #ifdef PA_USE_ALARM | #ifdef PA_USE_ALARM |
| alarm(0); | alarm(0); |
| #endif | #endif |
| return result; | return result; |
| } catch(...) { | } catch(...) { |
| #ifdef PA_USE_ALARM | #ifdef PA_USE_ALARM |
| alarm(0); | alarm(0); |
| #endif | #endif |
| if(sock>=0) | if(sock>=0) |
| closesocket(sock); | closesocket(sock); |
| rethrow; | rethrow; |
| } | } |
| #ifdef PA_USE_ALARM | #ifdef PA_USE_ALARM |
| Line 475 const char* pa_form2string_multipart(Has | Line 535 const char* pa_form2string_multipart(Has |
| return formpart.post(post_size); | return formpart.post(post_size); |
| } | } |
| static void find_headers_end(char* p, char*& headers_end_at, char*& raw_body) { | |
| raw_body=p; | |
| // \n\n | |
| // \r\n\r\n | |
| while((p=strchr(p, '\n'))) { | |
| headers_end_at=++p; // \n>.< | |
| if(*p=='\r') // \r\n>\r?<\n | |
| p++; | |
| if(*p=='\n') { // \r\n\r>\n?< | |
| raw_body=p+1; | |
| return; | |
| } | |
| } | |
| headers_end_at=0; | |
| } | |
| // Set-Cookie: name=value; Domain=docs.foo.com; Path=/accounts; Expires=Wed, 13-Jan-2021 22:23:01 GMT; Secure; HttpOnly | // Set-Cookie: name=value; Domain=docs.foo.com; Path=/accounts; Expires=Wed, 13-Jan-2021 22:23:01 GMT; Secure; HttpOnly |
| static ArrayString* parse_cookie(Request& r, const String& cookie) { | static ArrayString* parse_cookie(Request& r, const String& cookie) { |
| char *current=pa_strdup(cookie.cstr()); | char *current=pa_strdup(cookie.cstr()); |
| Line 567 Table* parse_cookies(Request& r, Table * | Line 611 Table* parse_cookies(Request& r, Table * |
| return &result; | return &result; |
| } | } |
| void *tables_update(HashStringValue& tables, const String::Body name, const String& value){ | void tables_update(HashStringValue& tables, const String::Body name, const String& value){ |
| Table *table; | Table *table; |
| if(Value *valready=tables.get(name)) { | if(Value *valready=tables.get(name)) { |
| // second+ appearence | // second+ appearence |
| Line 646 File_read_http_result pa_internal_file_r | Line 690 File_read_http_result pa_internal_file_r |
| omit_post_charset=vomit_post_charset->as_bool(); | omit_post_charset=vomit_post_charset->as_bool(); |
| } | } |
| if(Value* vcharset_name=options->get(PA_CHARSET_NAME)) { | if(Value* vcharset_name=options->get(PA_CHARSET_NAME)) { |
| asked_remote_charset=&charsets.get(vcharset_name->as_string().change_case(r.charsets.source(), String::CC_UPPER)); | asked_remote_charset=&pa_charsets.get(vcharset_name->as_string()); |
| } | } |
| if(Value* vresponse_charset_name=options->get(PA_RESPONSE_CHARSET_NAME)) { | if(Value* vresponse_charset_name=options->get(PA_RESPONSE_CHARSET_NAME)) { |
| valid_options++; | valid_options++; |
| real_remote_charset=&charsets.get(vresponse_charset_name->as_string().change_case(r.charsets.source(), String::CC_UPPER)); | real_remote_charset=&pa_charsets.get(vresponse_charset_name->as_string()); |
| } | } |
| if(Value* vuser=options->get(HTTP_USER)) { | if(Value* vuser=options->get(HTTP_USER)) { |
| valid_options++; | valid_options++; |
| Line 816 File_read_http_result pa_internal_file_r | Line 860 File_read_http_result pa_internal_file_r |
| } | } |
| } | } |
| char* response_str; | |
| size_t response_size; | HTTP_response response(connect_string); |
| // sending request | // sending request |
| int status_code=http_request(response_str, response_size, idna_host, port, request, request_size, timeout_secs, fail_on_status_ne_200); | int status_code=http_request(response, idna_host, port, request, request_size, timeout_secs, fail_on_status_ne_200); |
| // processing results | // processing results |
| char* raw_body; size_t raw_body_size; | char* raw_body=response.buf + response.body_offset; |
| char* headers_end_at; | size_t raw_body_size=response.length - response.body_offset; |
| find_headers_end(response_str, headers_end_at, raw_body); | |
| raw_body_size=response_size-(raw_body-response_str); | |
| result.headers=new HashStringValue; | result.headers=new HashStringValue; |
| VHash* vtables=new VHash; | VHash* vtables=new VHash; |
| result.headers->put("tables", vtables); | result.headers->put("tables", vtables); |
| ResponseHeaders response; | if (!real_remote_charset && !response.headers.content_type.is_empty()) |
| real_remote_charset=detect_charset(response.headers.content_type.cstr()); | |
| if(headers_end_at) { | |
| *headers_end_at=0; | |
| const String header_block(String::C(response_str, headers_end_at-response_str), String::L_TAINTED); | |
| ArrayString aheaders; | |
| size_t pos_after=0; | |
| header_block.split(aheaders, pos_after, "\n"); | |
| Array_iterator<const String*> i(aheaders); | |
| i.next(); // skipping status | |
| for(;i.has_next();){ | |
| const char *line=i.next()->cstr(); | |
| if(!response.add_header(line)) | |
| throw Exception("http.response", &connect_string, "bad response from host - bad header \"%s\"", line); | |
| } | |
| } | |
| if (!real_remote_charset && !response.content_type.is_empty()) | |
| real_remote_charset= detect_charset(response.content_type.cstr()); | |
| if(as_text) | if(as_text) |
| real_remote_charset=charsets.checkBOM(raw_body, raw_body_size, real_remote_charset); | real_remote_charset=pa_charsets.checkBOM(raw_body, raw_body_size, real_remote_charset); |
| if (!real_remote_charset) | if (!real_remote_charset) |
| real_remote_charset=asked_remote_charset; // never null | real_remote_charset=asked_remote_charset; // never null |
| for(Array_iterator<ResponseHeaders::Header> i(response.headers); i.has_next(); ){ | for(Array_iterator<ResponseHeaders::Header> i(response.headers.headers); i.has_next(); ){ |
| ResponseHeaders::Header header=i.next(); | ResponseHeaders::Header header=i.next(); |
| header.transcode(*real_remote_charset, r.charsets.source()); | header.transcode(*real_remote_charset, r.charsets.source()); |