int handle_response(char *ip, char *filename) { int i; char buffer[RESPONSE_BUFFER_SIZE]; int buffer_size = 0; int pointer = 0; char status_line[HEADER_LINE_LENGTH]; char header[HEADER_LINE_LENGTH]; char value[HEADER_LINE_LENGTH]; int status_ok; char header_content_length[HEADER_LINE_LENGTH]; char header_content_type[HEADER_LINE_LENGTH]; char header_last_modified[HEADER_LINE_LENGTH]; time_t curtime; char current_time[HEADER_LINE_LENGTH]; FILE *fp; /* fill buffer with first part of response */ buffer_size = get_response_header(buffer, RESPONSE_BUFFER_SIZE); if (buffer_size < 0) { printf("Request failed: could not retrieve response from server\n"); return 0; } /* read status line */ pointer = parse_status_line(buffer, buffer_size, status_line, HEADER_LINE_LENGTH, &status_ok); if (pointer < 0) { printf("Request failed: invalid response status code sent by server\n"); return 0; } /* default value for headers */ snprintf(header_content_length, HEADER_LINE_LENGTH, "Unknown"); snprintf(header_content_type, HEADER_LINE_LENGTH, "Unknown"); snprintf(header_last_modified, HEADER_LINE_LENGTH, "Unknown"); /* read headers */ while ((i = parse_header(buffer + pointer, buffer_size - pointer, header, HEADER_LINE_LENGTH, value, HEADER_LINE_LENGTH)) > 0) { pointer += i; if (strcmp(header, "Content-Length") == 0) { memcpy(header_content_length, value, HEADER_LINE_LENGTH); } else if (strcmp(header, "Content-Type") == 0) { memcpy(header_content_type, value, HEADER_LINE_LENGTH); } else if (strcmp(header, "Last-Modified") == 0) { memcpy(header_last_modified, value, HEADER_LINE_LENGTH); } } i = read_separator(buffer + pointer, buffer_size - pointer); if (i < 0) { printf("Request failed: invalid response sent by server\n"); return 0; } pointer += i; /* get current time */ time(&curtime); strftime(current_time, HEADER_LINE_LENGTH, DATE_TIME_FORMAT, gmtime(&curtime)); /* print some output */ printf("Request sent to http server at %s. Received response:\n", ip); printf(" The return code was: %s\n", status_line); printf(" Date of retrieval: %s\n", current_time); printf(" Document last modified at: %s\n", header_last_modified); printf(" Document size: %s bytes\n", header_content_length); printf(" Document's mime type: %s\n", header_content_type); if (!status_ok) { printf("Since the status code was not '200 OK', no data has been written\nto %s\n", filename); return 1; } /* open file for writing */ if ((fp = fopen(filename, "w")) == (FILE *)0) { switch (errno) { case EACCES: printf("No permissions to open file for writing: %s\n", filename); return 0; break; default: printf("Could not open file for writing: %s\n", filename); return 0; } } /* read until end of stream */ do { /* write buffer contents to file */ while (pointer < buffer_size) { putc(buffer[pointer], fp); pointer++; } signal(SIGALRM, alarm_handler); alarm(TIME_OUT); buffer_size = tcp_read(buffer, RESPONSE_BUFFER_SIZE); alarm(0); /* failed reading */ if (buffer_size < 0 || alarm_went_off) { /* Actually, we should write to a temp file and delete it here. Only if all data is received, copy temp file to real file. But this is a problem if we have write rights on filename, but not to create temp file. So we leave this for the time being. */ fclose(fp); printf("Request failed: could not retrieve message body\n"); printf("Wrote partial message body to file: %s\n", filename); return 0; } pointer = 0; } while (buffer_size); fclose(fp); printf("Wrote message body to file: %s\n", filename); return 1; }
/** * Function for modifying an event. * @param settings A pointer to caldav_settings. @see caldav_settings * @param error A pointer to caldav_error. @see caldav_error * @return TRUE in case of error, FALSE otherwise. */ gboolean caldav_modify(caldav_settings* settings, caldav_error* error) { CURL* curl; CURLcode res = 0; char error_buf[CURL_ERROR_SIZE]; struct config_data data; struct MemoryStruct chunk; struct MemoryStruct headers; struct curl_slist *http_header = NULL; gchar* search; gchar* uid; gboolean result = FALSE; gboolean LOCKSUPPORT = FALSE; gchar* lock_token = NULL; chunk.memory = NULL; /* we expect realloc(NULL, size) to work */ chunk.size = 0; /* no data at this point */ headers.memory = NULL; headers.size = 0; curl = get_curl(settings); if (!curl) { error->code = -1; error->str = g_strdup("Could not initialize libcurl"); g_free(settings->file); settings->file = NULL; return TRUE; } http_header = curl_slist_append(http_header, "Content-Type: application/xml; charset=\"utf-8\""); http_header = curl_slist_append(http_header, "Depth: 1"); http_header = curl_slist_append(http_header, "Expect:"); http_header = curl_slist_append(http_header, "Transfer-Encoding:"); http_header = curl_slist_append(http_header, "Connection: close"); data.trace_ascii = settings->trace_ascii; curl_easy_setopt(curl, CURLOPT_HTTPHEADER, http_header); /* send all data to this function */ curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteMemoryCallback); /* we pass our 'chunk' struct to the callback function */ curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void *)&chunk); /* send all data to this function */ curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, WriteHeaderCallback); /* we pass our 'headers' struct to the callback function */ curl_easy_setopt(curl, CURLOPT_WRITEHEADER, (void *)&headers); curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, (char *) &error_buf); if (settings->debug) { curl_easy_setopt(curl, CURLOPT_DEBUGFUNCTION, my_trace); curl_easy_setopt(curl, CURLOPT_DEBUGDATA, &data); curl_easy_setopt(curl, CURLOPT_VERBOSE, 1); } gchar* file = g_strdup(settings->file); if ((uid = get_response_header("uid", file, FALSE)) == NULL) { g_free(file); error->code = 1; error->str = g_strdup("Error: Missing required UID for object"); return TRUE; } g_free(file); /* * collation is not supported by ICalendar. * <C:text-match collation=\"i;ascii-casemap\">%s</C:text-match> */ search = g_strdup_printf( "%s\r\n<C:text-match>%s</C:text-match>\r\n%s", search_head, uid, search_tail); g_free(uid); /* enable uploading */ curl_easy_setopt(curl, CURLOPT_POSTFIELDS, search); curl_easy_setopt (curl, CURLOPT_POSTFIELDSIZE, strlen(search)); curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, "REPORT"); curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1); curl_easy_setopt(curl, CURLOPT_UNRESTRICTED_AUTH, 1); curl_easy_setopt(curl, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL); res = curl_easy_perform(curl); curl_slist_free_all(http_header); http_header = NULL; g_free(search); if (res != 0) { error->code = -1; error->str = g_strdup_printf("%s", error_buf); g_free(settings->file); settings->file = NULL; result = TRUE; } else { long code; res = curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &code); if (code != 207) { error->code = code; error->str = g_strdup(chunk.memory); result = TRUE; } else { /* enable uploading */ gchar* url = NULL; gchar* etag = NULL; url = get_url(chunk.memory); if (url) { etag = get_etag(chunk.memory); if (etag) { gchar* host = get_host(settings->url); if (host) { file = g_strdup(url); g_free(url); url = g_strdup_printf("%s%s", host, file); g_free(file); g_free(host); } else { g_free(etag); g_free(url); url = NULL; } } else { g_free(url); url = NULL; } if (url) { int lock = 0; caldav_error lock_error; file = g_strdup(etag); g_free(etag); etag = g_strdup_printf("If-Match: %s", file); g_free(file); http_header = curl_slist_append(http_header, etag); g_free(etag); http_header = curl_slist_append(http_header, "Content-Type: text/calendar; charset=\"utf-8\""); http_header = curl_slist_append(http_header, "Expect:"); http_header = curl_slist_append( http_header, "Transfer-Encoding:"); http_header = curl_slist_append(http_header, "Connection: close"); if (settings->use_locking) LOCKSUPPORT = caldav_lock_support(settings, &lock_error); else LOCKSUPPORT = FALSE; if (LOCKSUPPORT) { lock_token = caldav_lock_object(url, settings, &lock_error); if (lock_token) { http_header = curl_slist_append( http_header, g_strdup_printf( "If: (%s)", lock_token)); } /* * If error code is 423 (Resource is LOCKED) bail out */ else if (lock_error.code == 423) { lock = -1; } /* * If error code is 501 (Not implemented) we continue * hoping for the best. */ else if (lock_error.code == 501) { lock_token = g_strdup(""); } else { lock = -1; } } if (! LOCKSUPPORT || (LOCKSUPPORT && lock_token && lock_error.code != 423)) { curl_easy_setopt(curl, CURLOPT_HTTPHEADER, http_header); curl_easy_setopt(curl, CURLOPT_URL, rebuild_url(settings, url)); curl_easy_setopt(curl, CURLOPT_POSTFIELDS, settings->file); curl_easy_setopt (curl, CURLOPT_POSTFIELDSIZE, strlen(settings->file)); curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1); curl_easy_setopt(curl, CURLOPT_UNRESTRICTED_AUTH, 1); curl_easy_setopt(curl, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL); curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, "PUT"); res = curl_easy_perform(curl); if (LOCKSUPPORT && lock_token) { caldav_unlock_object( lock_token, url, settings, &lock_error); } } g_free(url); g_free(lock_token); if (res != 0 || lock < 0) { /* Is this a lock_error don't change error*/ if (lock == 0 || lock_error.code == 423) { error->code = code; error->str = g_strdup(chunk.memory); } else { error->code = lock_error.code; error->str = g_strdup(lock_error.str); } result = TRUE; g_free(settings->file); settings->file = NULL; } else { long code; res = curl_easy_getinfo( curl, CURLINFO_RESPONSE_CODE, &code); if (code != 204) { error->code = code; error->str = g_strdup(chunk.memory); result = TRUE; } } curl_slist_free_all(http_header); } else { error->code = code; if (chunk.memory) error->str = g_strdup(chunk.memory); else error->str = g_strdup("No object found"); result = TRUE; } } else { /* * No object found on server. Posible synchronization * problem or a server side race condition */ error->code = 409; error->str = g_strdup("No object found"); result = TRUE; } } } if (chunk.memory) free(chunk.memory); if (headers.memory) free(headers.memory); curl_easy_cleanup(curl); return result; }