Holger Freyther | 219518d | 2009-01-02 22:04:43 +0000 | [diff] [blame] | 1 | /* (C) 2009 by Holger Hans Peter Freyther <zecke@selfish.org> |
| 2 | * All Rights Reserved |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License as published by |
| 6 | * the Free Software Foundation; either version 2 of the License, or |
| 7 | * (at your option) any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License along |
| 15 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 17 | * |
| 18 | */ |
| 19 | /* |
| 20 | * I'm lazy and will not introduce lemon to this game. Our telnet |
| 21 | * interface is matching line based so we can have a pattern that |
| 22 | * is matching a line and everyone will be happy. |
| 23 | */ |
| 24 | |
| 25 | %option never-interactive |
| 26 | %option noyywrap |
| 27 | %option reentrant |
| 28 | |
| 29 | %{ |
| 30 | #include <string.h> |
| 31 | #include <openbsc/telnet_interface.h> |
| 32 | |
| 33 | extern char *strndup(const char *s, size_t n); |
| 34 | extern void telnet_write_help(int); |
| 35 | extern void telnet_close_client(struct bsc_fd*); |
| 36 | extern void telnet_error_client(int fd); |
| 37 | extern void telnet_page(struct telnet_connection *con, const char *imsi, int page); |
| 38 | extern void telnet_call(struct telnet_connection *con, const char *imsi, |
| 39 | const char* origin); |
| 40 | extern void telnet_put_channel(struct telnet_connection*, const char *imsi); |
| 41 | extern void telnet_get_channel(struct telnet_connection*, const char *imsi); |
| 42 | extern void telnet_send_gsm_48(struct telnet_connection*); |
| 43 | extern void telnet_send_gsm_11(struct telnet_connection*); |
| 44 | |
| 45 | static const int PAGE_LEN = 5; /* "page " */ |
| 46 | static const int CALL_LEN = 5; /* "call " */ |
| 47 | static const int PUT_LEN = 12; /* "put_channel " */ |
| 48 | static const int GET_LEN = 12; /* "get_channel " */ |
| 49 | static const int NET_LEN = 3; /* "48 " "11 " */ |
| 50 | |
| 51 | #define YY_EXTRA_TYPE struct telnet_connection* |
| 52 | |
| 53 | /* the string is null terminated */ |
| 54 | static int parse_hex(char *hex) |
| 55 | { |
| 56 | int byte; |
| 57 | sscanf(hex, "%x", &byte); |
| 58 | return byte; |
| 59 | } |
| 60 | |
| 61 | #define PREPARE_STRING(len) \ |
| 62 | yytext[yyleng-1] = '\0'; \ |
| 63 | char *str = yytext + len; \ |
| 64 | char *pag = strstr(str, "\r"); \ |
| 65 | if (pag) pag[0] = '\0'; \ |
| 66 | pag = strstr(str, "\n"); \ |
| 67 | if (pag) pag[0] = '\0'; |
| 68 | |
| 69 | %} |
| 70 | |
| 71 | CMD_HELP "help" |
| 72 | CMD_EXIT "exit" |
| 73 | CMD_CLOSE "close" |
| 74 | CMD_PAGE "page" |
| 75 | CMD_GET_CHANNEL "get_channel" |
| 76 | CMD_PUT_CHANNEL "put_channel" |
| 77 | CMD_CALL "call" |
| 78 | CMD_48 "48" |
| 79 | CMD_11 "11" |
| 80 | |
| 81 | LINE_END \n|\r\n |
| 82 | HEX [0][x][0-9a-zA-Z][0-9a-zA-Z] |
| 83 | |
| 84 | %s READ_HEX_BYTES |
| 85 | |
| 86 | %% |
| 87 | {CMD_HELP}{LINE_END} {telnet_write_help(yyextra->fd.fd); yyterminate();} |
| 88 | {CMD_EXIT}{LINE_END} {telnet_close_client(&yyextra->fd); yyterminate();} |
| 89 | {CMD_CLOSE}{LINE_END} {telnet_close_client(&yyextra->fd); yyterminate();} |
| 90 | {CMD_PAGE}[ ][0-9]+{LINE_END} { |
| 91 | PREPARE_STRING(PAGE_LEN) |
| 92 | telnet_page(yyextra, str, 0); |
| 93 | yyterminate(); |
| 94 | } |
| 95 | {CMD_PAGE}[ ][0-9]+[ ][0-2]{LINE_END} { |
| 96 | PREPARE_STRING(PAGE_LEN) |
| 97 | char *sp = strstr(str, " "); |
| 98 | sp[0] = '\0'; |
| 99 | telnet_page(yyextra, str, atoi(sp+1)); |
| 100 | yyterminate(); |
| 101 | } |
| 102 | {CMD_PUT_CHANNEL}[ ][0-9]+{LINE_END} { |
| 103 | PREPARE_STRING(PUT_LEN) |
| 104 | telnet_put_channel(yyextra, str); |
| 105 | yyterminate(); |
| 106 | } |
| 107 | {CMD_GET_CHANNEL}[ ][0-9]+{LINE_END} { |
| 108 | PREPARE_STRING(GET_LEN) |
| 109 | telnet_get_channel(yyextra, str); |
| 110 | yyterminate(); |
| 111 | } |
| 112 | {CMD_CALL}[ ][0-9]+[ ][0-9]+{LINE_END} { |
| 113 | PREPARE_STRING(CALL_LEN) |
| 114 | char *sp = strstr(str, " "); |
| 115 | sp[0] = '\0'; |
| 116 | telnet_call(yyextra, str, sp+1); |
| 117 | yyterminate(); |
| 118 | } |
| 119 | {CMD_CALL}[ ][0-9]+{LINE_END} { |
| 120 | PREPARE_STRING(CALL_LEN) |
| 121 | telnet_call(yyextra, str, NULL); |
| 122 | yyterminate(); |
| 123 | } |
| 124 | <READ_HEX_BYTES>{HEX} { |
| 125 | if (yyextra->read >= sizeof(yyextra->commands)) { |
| 126 | yyterminate(); |
| 127 | } |
| 128 | yytext[yyleng] = '\0'; |
| 129 | yyextra->commands[yyextra->read++] = parse_hex(yytext+2); |
| 130 | } |
| 131 | <READ_HEX_BYTES>{LINE_END} { |
| 132 | if (yyextra->command == TELNET_COMMAND_11) { |
| 133 | telnet_send_gsm_11(yyextra); |
| 134 | } else if (yyextra->command == TELNET_COMMAND_48) { |
| 135 | telnet_send_gsm_48(yyextra); |
| 136 | } |
| 137 | |
| 138 | if (yyextra->imsi) { |
| 139 | free(yyextra->imsi); |
| 140 | yyextra->imsi = NULL; |
| 141 | } |
| 142 | yyterminate(); |
| 143 | } |
| 144 | <INITIAL>{CMD_48}[ ][0-9]+ { |
| 145 | BEGIN READ_HEX_BYTES; |
| 146 | yyextra->read = 0; |
| 147 | yyextra->command = TELNET_COMMAND_48; |
| 148 | yytext[yyleng-1] = '\0'; |
| 149 | yyextra->imsi = strdup(yytext); |
| 150 | } |
| 151 | |
| 152 | <INITIAL>{CMD_11}[ ][0-9]+ { |
| 153 | BEGIN READ_HEX_BYTES; |
| 154 | yyextra->read = 0; |
| 155 | yyextra->command = TELNET_COMMAND_11; |
| 156 | yytext[yyleng-1] = '\0'; |
| 157 | yyextra->imsi = strdup(yytext); |
| 158 | } |
| 159 | |
| 160 | |
| 161 | |
| 162 | [ \t\r\n] /* Ommit */ |
| 163 | . { telnet_error_client(yyextra->fd.fd); yyterminate(); } |
| 164 | |
| 165 | %% |
| 166 | |
| 167 | void telnet_parse(struct telnet_connection *conn, char *buf) |
| 168 | { |
| 169 | yyscan_t scanner; |
| 170 | yylex_init(&scanner); |
| 171 | yyset_extra(conn, scanner); |
| 172 | yy_scan_string(buf, scanner); |
| 173 | yylex(scanner); |
| 174 | yylex_destroy(scanner); |
| 175 | |
| 176 | if (conn->imsi) { |
| 177 | free(conn->imsi); |
| 178 | conn->imsi = NULL; |
| 179 | } |
| 180 | } |