1 /* $OpenBSD: pptp_subr.c,v 1.3 2010/07/02 21:20:57 yasuoka Exp $ */ 2 3 /*- 4 * Copyright (c) 2009 Internet Initiative Japan Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 /* utility functions for the pptp.c */ 30 31 #include <sys/types.h> 32 #include <sys/socket.h> 33 #include <sys/time.h> 34 #include <netinet/in.h> 35 #include <stdio.h> 36 #include <string.h> 37 #include <event.h> 38 39 #include "bytebuf.h" 40 #include "hash.h" 41 #include "slist.h" 42 43 #include "pptp.h" 44 #include "pptp_local.h" 45 #include "pptp_subr.h" 46 47 /* convert the Faming Capability bit as CSV strings */ 48 const char * 49 pptp_framing_string(uint32_t bits) 50 { 51 static char framing_cap_buf[40]; 52 53 snprintf(framing_cap_buf, sizeof(framing_cap_buf), "%s%s", 54 (bits & PPTP_CTRL_FRAMING_ASYNC)? ",async" : "", 55 (bits & PPTP_CTRL_FRAMING_SYNC)? ",sync" : ""); 56 57 if (strlen(framing_cap_buf) > 0) 58 return &framing_cap_buf[1]; 59 60 return ""; 61 } 62 63 64 /* convert the Bearer Capability bit as CSV strings */ 65 const char * 66 pptp_bearer_string(uint32_t bits) 67 { 68 static char bearer_cap_buf[40]; 69 70 snprintf(bearer_cap_buf, sizeof(bearer_cap_buf), "%s%s", 71 (bits &PPTP_CTRL_BEARER_ANALOG)? ",analog" : "", 72 (bits &PPTP_CTRL_BEARER_DIGITAL)? ",digital" : ""); 73 74 if (strlen(bearer_cap_buf) > 0) 75 return &bearer_cap_buf[1]; 76 77 return ""; 78 } 79 80 /* build common header part of a control packet */ 81 void 82 pptp_init_header(struct pptp_ctrl_header *header, int length, int ctrl_mes_type) 83 { 84 header->length = htons(length); 85 header->pptp_message_type = htons(PPTP_MES_TYPE_CTRL); 86 header->magic_cookie = htonl(PPTP_MAGIC_COOKIE); 87 header->control_message_type = htons(ctrl_mes_type); 88 header->reserved0 = 0; 89 } 90 91 #define NAME_VAL(x) { x, #x } 92 static struct _label_name { 93 int label; 94 const char *name; 95 } pptp_StopCCRQ_reason_labels[] = { 96 NAME_VAL(PPTP_StopCCRQ_REASON_NONE), 97 NAME_VAL(PPTP_StopCCRQ_REASON_STOP_PROTOCOL), 98 NAME_VAL(PPTP_StopCCRQ_REASON_STOP_LOCAL_SHUTDOWN), 99 }, pptp_StopCCRP_result_labels[] = { 100 NAME_VAL(PPTP_StopCCRP_RESULT_OK), 101 NAME_VAL(PPTP_StopCCRP_RESULT_GENERIC_ERROR), 102 }, pptp_general_error_labels[] = { 103 NAME_VAL(PPTP_ERROR_NONE), 104 NAME_VAL(PPTP_ERROR_NOT_CONNECTED), 105 NAME_VAL(PPTP_ERROR_BAD_FORMAT), 106 NAME_VAL(PPTP_ERROR_NO_RESOURCE), 107 NAME_VAL(PPTP_ERROR_BAD_CALL), 108 }, pptp_ctrl_mes_type_labels[] = { 109 NAME_VAL(PPTP_CTRL_MES_CODE_SCCRQ), 110 NAME_VAL(PPTP_CTRL_MES_CODE_SCCRP), 111 NAME_VAL(PPTP_CTRL_MES_CODE_StopCCRQ), 112 NAME_VAL(PPTP_CTRL_MES_CODE_StopCCRP), 113 NAME_VAL(PPTP_CTRL_MES_CODE_ECHO_RQ), 114 NAME_VAL(PPTP_CTRL_MES_CODE_ECHO_RP), 115 NAME_VAL(PPTP_CTRL_MES_CODE_OCRQ), 116 NAME_VAL(PPTP_CTRL_MES_CODE_OCRP), 117 NAME_VAL(PPTP_CTRL_MES_CODE_ICRQ), 118 NAME_VAL(PPTP_CTRL_MES_CODE_ICRP), 119 NAME_VAL(PPTP_CTRL_MES_CODE_ICCN), 120 NAME_VAL(PPTP_CTRL_MES_CODE_CCR), 121 NAME_VAL(PPTP_CTRL_MES_CODE_CDN), 122 NAME_VAL(PPTP_CTRL_MES_CODE_SLI), 123 }, pptp_CDN_result_labels[] = { 124 NAME_VAL(PPTP_CDN_RESULT_LOST_CARRIER), 125 NAME_VAL(PPTP_CDN_RESULT_GENRIC_ERROR), 126 NAME_VAL(PPTP_CDN_RESULT_ADMIN_SHUTDOWN), 127 NAME_VAL(PPTP_CDN_RESULT_REQUEST), 128 }; 129 130 131 /* value to strings convert macros */ 132 #define LABEL_TO_STRING(func_name, label_names, prefix_len) \ 133 const char * \ 134 func_name(int code) \ 135 { \ 136 int i; \ 137 \ 138 for (i = 0; i < countof(label_names); i++) { \ 139 if (label_names[i].label == code) \ 140 return label_names[i].name + prefix_len;\ 141 } \ 142 \ 143 return "UNKNOWN"; \ 144 } 145 LABEL_TO_STRING(pptp_StopCCRQ_reason_string, pptp_StopCCRQ_reason_labels, 21) 146 LABEL_TO_STRING(pptp_StopCCRP_result_string, pptp_StopCCRP_result_labels, 21) 147 LABEL_TO_STRING(pptp_general_error_string, pptp_general_error_labels, 11) 148 LABEL_TO_STRING(pptp_ctrl_mes_type_string, pptp_ctrl_mes_type_labels, 19) 149 LABEL_TO_STRING(pptp_CDN_result_string, pptp_CDN_result_labels, 16) 150