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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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