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Annotation of qemu/roms/ipxe/src/net/udp/syslog.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (C) 2011 Michael Brown <[email protected]>.
        !             3:  *
        !             4:  * This program is free software; you can redistribute it and/or
        !             5:  * modify it under the terms of the GNU General Public License as
        !             6:  * published by the Free Software Foundation; either version 2 of the
        !             7:  * License, or any later version.
        !             8:  *
        !             9:  * This program is distributed in the hope that it will be useful, but
        !            10:  * WITHOUT ANY WARRANTY; without even the implied warranty of
        !            11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
        !            12:  * General Public License for more details.
        !            13:  *
        !            14:  * You should have received a copy of the GNU General Public License
        !            15:  * along with this program; if not, write to the Free Software
        !            16:  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
        !            17:  */
        !            18: 
        !            19: FILE_LICENCE ( GPL2_OR_LATER );
        !            20: 
        !            21: /** @file
        !            22:  *
        !            23:  * Syslog protocol
        !            24:  *
        !            25:  */
        !            26: 
        !            27: #include <stdint.h>
        !            28: #include <byteswap.h>
        !            29: #include <ipxe/xfer.h>
        !            30: #include <ipxe/open.h>
        !            31: #include <ipxe/tcpip.h>
        !            32: #include <ipxe/dhcp.h>
        !            33: #include <ipxe/settings.h>
        !            34: #include <ipxe/console.h>
        !            35: #include <ipxe/ansiesc.h>
        !            36: #include <ipxe/syslog.h>
        !            37: 
        !            38: /** The syslog server */
        !            39: static struct sockaddr_tcpip logserver = {
        !            40:        .st_port = htons ( SYSLOG_PORT ),
        !            41: };
        !            42: 
        !            43: /** Syslog UDP interface operations */
        !            44: static struct interface_operation syslogger_operations[] = {};
        !            45: 
        !            46: /** Syslog UDP interface descriptor */
        !            47: static struct interface_descriptor syslogger_desc =
        !            48:        INTF_DESC_PURE ( syslogger_operations );
        !            49: 
        !            50: /** The syslog UDP interface */
        !            51: static struct interface syslogger = INTF_INIT ( syslogger_desc );
        !            52: 
        !            53: /******************************************************************************
        !            54:  *
        !            55:  * Console driver
        !            56:  *
        !            57:  ******************************************************************************
        !            58:  */
        !            59: 
        !            60: /** Syslog line buffer */
        !            61: static char syslog_buffer[SYSLOG_BUFSIZE];
        !            62: 
        !            63: /** Index into syslog line buffer */
        !            64: static unsigned int syslog_idx;
        !            65: 
        !            66: /** Syslog recursion marker */
        !            67: static int syslog_entered;
        !            68: 
        !            69: /** Syslog ANSI escape sequence handlers */
        !            70: static struct ansiesc_handler syslog_ansiesc_handlers[] = {
        !            71:        { 0, NULL }
        !            72: };
        !            73: 
        !            74: /** Syslog ANSI escape sequence context */
        !            75: static struct ansiesc_context syslog_ansiesc_ctx = {
        !            76:        .handlers = syslog_ansiesc_handlers,
        !            77: };
        !            78: 
        !            79: /**
        !            80:  * Print a character to syslog console
        !            81:  *
        !            82:  * @v character                Character to be printed
        !            83:  */
        !            84: static void syslog_putchar ( int character ) {
        !            85:        int rc;
        !            86: 
        !            87:        /* Do nothing if we have no log server */
        !            88:        if ( ! logserver.st_family )
        !            89:                return;
        !            90: 
        !            91:        /* Ignore if we are already mid-logging */
        !            92:        if ( syslog_entered )
        !            93:                return;
        !            94: 
        !            95:        /* Strip ANSI escape sequences */
        !            96:        character = ansiesc_process ( &syslog_ansiesc_ctx, character );
        !            97:        if ( character < 0 )
        !            98:                return;
        !            99: 
        !           100:        /* Ignore carriage return */
        !           101:        if ( character == '\r' )
        !           102:                return;
        !           103: 
        !           104:        /* Treat newline as a terminator */
        !           105:        if ( character == '\n' )
        !           106:                character = 0;
        !           107: 
        !           108:        /* Add character to buffer */
        !           109:        syslog_buffer[syslog_idx++] = character;
        !           110: 
        !           111:        /* Do nothing more unless we reach end-of-line (or end-of-buffer) */
        !           112:        if ( ( character != 0 ) &&
        !           113:             ( syslog_idx < ( sizeof ( syslog_buffer ) - 1 /* NUL */ ) ) ) {
        !           114:                return;
        !           115:        }
        !           116: 
        !           117:        /* Reset to start of buffer */
        !           118:        syslog_idx = 0;
        !           119: 
        !           120:        /* Guard against re-entry */
        !           121:        syslog_entered = 1;
        !           122: 
        !           123:        /* Send log message */
        !           124:        if ( ( rc = xfer_printf ( &syslogger, "<%d>ipxe: %s",
        !           125:                                  SYSLOG_PRIORITY ( SYSLOG_FACILITY,
        !           126:                                                    SYSLOG_SEVERITY ),
        !           127:                                  syslog_buffer ) ) != 0 ) {
        !           128:                DBG ( "SYSLOG could not send log message: %s\n",
        !           129:                      strerror ( rc ) );
        !           130:        }
        !           131: 
        !           132:        /* Clear re-entry flag */
        !           133:        syslog_entered = 0;
        !           134: }
        !           135: 
        !           136: /** Syslog console driver */
        !           137: struct console_driver syslog_console __console_driver = {
        !           138:        .putchar = syslog_putchar,
        !           139: };
        !           140: 
        !           141: /******************************************************************************
        !           142:  *
        !           143:  * Settings
        !           144:  *
        !           145:  ******************************************************************************
        !           146:  */
        !           147: 
        !           148: /** Syslog server setting */
        !           149: struct setting syslog_setting __setting ( SETTING_MISC ) = {
        !           150:        .name = "syslog",
        !           151:        .description = "Syslog server",
        !           152:        .tag = DHCP_LOG_SERVERS,
        !           153:        .type = &setting_type_ipv4,
        !           154: };
        !           155: 
        !           156: /**
        !           157:  * Apply syslog settings
        !           158:  *
        !           159:  * @ret rc             Return status code
        !           160:  */
        !           161: static int apply_syslog_settings ( void ) {
        !           162:        struct sockaddr_in *sin_logserver =
        !           163:                ( struct sockaddr_in * ) &logserver;
        !           164:        struct in_addr old_addr;
        !           165:        int len;
        !           166:        int rc;
        !           167: 
        !           168:        /* Fetch log server */
        !           169:        old_addr.s_addr = sin_logserver->sin_addr.s_addr;
        !           170:        logserver.st_family = 0;
        !           171:        if ( ( len = fetch_ipv4_setting ( NULL, &syslog_setting,
        !           172:                                          &sin_logserver->sin_addr ) ) >= 0 ) {
        !           173:                sin_logserver->sin_family = AF_INET;
        !           174:        }
        !           175: 
        !           176:        /* Do nothing unless log server has changed */
        !           177:        if ( sin_logserver->sin_addr.s_addr == old_addr.s_addr )
        !           178:                return 0;
        !           179: 
        !           180:        /* Reset syslog connection */
        !           181:        intf_restart ( &syslogger, 0 );
        !           182: 
        !           183:        /* Do nothing unless we have a log server */
        !           184:        if ( ! logserver.st_family ) {
        !           185:                DBG ( "SYSLOG has no log server\n" );
        !           186:                return 0;
        !           187:        }
        !           188: 
        !           189:        /* Connect to log server */
        !           190:        if ( ( rc = xfer_open_socket ( &syslogger, SOCK_DGRAM,
        !           191:                                       ( ( struct sockaddr * ) &logserver ),
        !           192:                                       NULL ) ) != 0 ) {
        !           193:                DBG ( "SYSLOG cannot connect to log server: %s\n",
        !           194:                      strerror ( rc ) );
        !           195:                return rc;
        !           196:        }
        !           197:        DBG ( "SYSLOG using log server %s\n",
        !           198:              inet_ntoa ( sin_logserver->sin_addr ) );
        !           199: 
        !           200:        return 0;
        !           201: }
        !           202: 
        !           203: /** Syslog settings applicator */
        !           204: struct settings_applicator syslog_applicator __settings_applicator = {
        !           205:        .apply = apply_syslog_settings,
        !           206: };

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