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akari: Commit


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Revisão596 (tree)
Hora2018-09-13 15:03:40
Autorkumaneko

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Add udpsysrqd program

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--- branches/udpsysrqd/COPYING (nonexistent)
+++ branches/udpsysrqd/COPYING (revision 596)
@@ -0,0 +1,339 @@
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--- branches/udpsysrqd/Makefile (nonexistent)
+++ branches/udpsysrqd/Makefile (revision 596)
@@ -0,0 +1,22 @@
1+INSTALL := install
2+USRBINDIR := /usr/bin
3+USRDOCDIR := /usr/share/doc
4+ifndef CFLAGS
5+CFLAGS := -Wall -O2 -g -D_FORTIFY_SOURCE=2
6+endif
7+
8+all: udpsysrqd
9+
10+udpsysrqd: udpsysrqd.c
11+ $(CC) $(CPPFLAGS) $(CFLAGS) $(LDFLAGS) -o udpsysrqd udpsysrqd.c
12+
13+install: all
14+ mkdir -p -m 0755 $(INSTALLDIR)$(USRBINDIR)
15+ $(INSTALL) -m 0755 udpsysrqd $(INSTALLDIR)$(USRBINDIR)
16+ mkdir -p -m 0755 $(INSTALLDIR)$(USRDOCDIR)/udpsysrqd/
17+ $(INSTALL) -m 0644 README COPYING udpsysrqd.conf $(INSTALLDIR)$(USRDOCDIR)/udpsysrqd/
18+
19+clean:
20+ rm -f -- udpsysrqd
21+
22+.PHONY: clean install
--- branches/udpsysrqd/README (nonexistent)
+++ branches/udpsysrqd/README (revision 596)
@@ -0,0 +1,63 @@
1+About this package:
2+
3+ When troubleshooting system freeze problems, obtaining SysRq messages
4+ is commonly used. However, it is impossible for administrators to
5+ use the SysRq keys if he/she is not seated in front of the console.
6+
7+ This package contains a utility for triggering SysRq via UDP packets
8+ based on an assumption that the kernel's scheduling functionality is
9+ alive.
10+
11+ This package is released under the GPLv2.
12+
13+How to use this utility:
14+
15+ There are 4 entries which are given via a configuration file
16+ specified at command line. Included udpsysrqd.conf is an example.
17+
18+ listen_ip $listen_ip
19+
20+ $listen_ip specifies the local IPv4 or IPv6 address to listen to.
21+ Default value is :: if IPv6 is available, 0.0.0.0 otherwise.
22+
23+ listen_port $listen_port
24+
25+ $listen_port specifies the local port number to listen to.
26+ Default value is 0.
27+
28+ trap $sysrq $magic
29+
30+ $sysrq is a SysRq command (e.g. h t w, or combination of them).
31+
32+ $magic is a string which writes $sysrq to /proc/sysrq-trigger
33+ when a UDP packet containing this string was received.
34+ Since $magic can contain only bytes in 0x21-0x5B,0x5D-0x7E range,
35+ please note that packets containing end of line bytes won't match.
36+
37+ Although $magic acts like a password which prevents unwanted sources
38+ from triggering $sysrq , you must ensure security by other means
39+ because $magic is sent as a plain clear text and is very vulnerable
40+ to attacks such as eavesdropping and brute force.
41+
42+ This entry is optional if "default " entry is specified.
43+ You can specify this entry for up to 256 times.
44+
45+ default $timeout1 [ $sysrq1 [ $timeout2 [ $sysrq2 [ ... ]]]]
46+
47+ $timeoutX is a timeout in milliseconds waiting for a UDP packet
48+ to arrive. A negative value (e.g. -1) means no timeout.
49+
50+ $sysrqX is a SysRq command which will be written to
51+ /proc/sysrq-trigger when no packets are received within
52+ $timeoutX timeout.
53+
54+ Upon $timeout1, $sysrq1 is written and new timeout becomes $timeout2.
55+ Upon $timeout2, $sysrq2 is written and new timeout becomes $timeout3.
56+ Upon $timeout3, $sysrq3 is written and new timeout becomes $timeout4.
57+
58+ -1 is implicitly appended to the tail of this entry which means that
59+ no more actions will be taken automatically.
60+
61+ If a UDP packet arrives, new timeout becomes $timeout1.
62+
63+ This entry is optional if "trap " entry is specified.
--- branches/udpsysrqd/udpsysrqd.c (nonexistent)
+++ branches/udpsysrqd/udpsysrqd.c (revision 596)
@@ -0,0 +1,328 @@
1+/*
2+ * Simple SysRq daemon - A utility for triggering SysRq via UDP packets.
3+ *
4+ * Written by Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
5+ *
6+ * Distributed under GPL v2.
7+ */
8+#include <stdio.h>
9+#include <string.h>
10+#include <stdlib.h>
11+#include <unistd.h>
12+#include <poll.h>
13+#include <sys/types.h>
14+#include <sys/stat.h>
15+#include <fcntl.h>
16+#include <sys/socket.h>
17+#include <arpa/inet.h>
18+#include <stdarg.h>
19+#include <errno.h>
20+#include <sys/mman.h>
21+
22+/* Structure for holding IPv4 or IPv6 address. */
23+union ipaddr {
24+ struct sockaddr_in ip4;
25+ struct sockaddr_in6 ip6;
26+};
27+
28+/* Structure for holding on-demand SysRq action list. */
29+#define MAX_TRAPS 256
30+static struct command {
31+ const char *magic;
32+ const char *command;
33+ int magic_len;
34+ int command_len;
35+} traps[MAX_TRAPS];
36+
37+/* Default actions with timeouts. */
38+static char *default_action = NULL;
39+/* Number of on-demand actions defined. */
40+static int num_traps = 0;
41+/* File descriptor for /proc/sysrq-trigger . */
42+static int sysrq_fd = EOF;
43+/* Receiver socket's file descriptor. */
44+static int socket_fd = EOF;
45+
46+/**
47+ * die - Print error and exit.
48+ *
49+ * @fmt: Format string, followed by arguments.
50+ *
51+ * This function does not return.
52+ */
53+static void die(const char *fmt, ...) __attribute__((format(printf, 1, 2)));
54+static void die(const char *fmt, ...)
55+{
56+ const int err = errno;
57+ va_list args;
58+ va_start(args, fmt);
59+ vfprintf(stderr, fmt, args);
60+ va_end(args);
61+ fprintf(stderr, " : %s(%d)\n", strerror(err), err);
62+ exit(1);
63+}
64+
65+/**
66+ * help - Print help and exit.
67+ *
68+ * @fmt: Format string, followed by arguments.
69+ *
70+ * This function does not return.
71+ */
72+static void help(const char *fmt, ...) __attribute__((format(printf, 1, 2)));
73+static void help(const char *fmt, ...)
74+{
75+ va_list args;
76+ fprintf(stderr, "Simple SysRq daemon\n\nError: ");
77+ va_start(args, fmt);
78+ vfprintf(stderr, fmt, args);
79+ va_end(args);
80+ fprintf(stderr, "\n\nPlease see the README file.\n");
81+ exit(1);
82+}
83+
84+/**
85+ * get_addr - Get string representation of IP address.
86+ *
87+ * @ipv6: True if @addr contains an IPv6 address, false otheriwse.
88+ * @addr: Pointer to "union ipaddr".
89+ *
90+ * Returns static buffer to IP string.
91+ */
92+static const char *get_addr(_Bool ipv6, const union ipaddr *addr)
93+{
94+ static char buf[40];
95+ memset(buf, 0, sizeof(buf));
96+ if (ipv6)
97+ inet_ntop(AF_INET6, &addr->ip6.sin6_addr, buf, sizeof(buf));
98+ else
99+ inet_ntop(AF_INET, &addr->ip4.sin_addr, buf, sizeof(buf));
100+ return buf;
101+}
102+
103+/**
104+ * normalize_line - Format string.
105+ *
106+ * @buffer: The line to normalize.
107+ *
108+ * Returns nothing.
109+ *
110+ * Leading and trailing whitespaces are removed.
111+ * Multiple whitespaces are packed into single space.
112+ */
113+static void normalize_line(char *buffer)
114+{
115+ unsigned char *sp = (unsigned char *) buffer;
116+ unsigned char *dp = (unsigned char *) buffer;
117+ _Bool first = 1;
118+ while (*sp && (*sp <= ' ' || 127 <= *sp))
119+ sp++;
120+ while (*sp) {
121+ if (!first)
122+ *dp++ = ' ';
123+ first = 0;
124+ while (' ' < *sp && *sp < 127)
125+ *dp++ = *sp++;
126+ while (*sp && (*sp <= ' ' || 127 <= *sp))
127+ sp++;
128+ }
129+ *dp = '\0';
130+}
131+
132+/**
133+ * my_strdup - strdup() with error checking.
134+ *
135+ * @str: The string to duplicate.
136+ *
137+ * Returns a duplicated string on success, abort otherwise.
138+ */
139+static char *my_strdup(const char *str)
140+{
141+ char *cp = strdup(str);
142+ if (!cp) {
143+ fprintf(stderr, "Out of memory.\n");
144+ exit(1);
145+ }
146+ return cp;
147+}
148+
149+/**
150+ * do_init - Initialization function.
151+ *
152+ * @argc: Number of arguments.
153+ * @argv: Arguments.
154+ *
155+ * Returns nothing.
156+ */
157+static void do_init(int argc, char *argv[])
158+{
159+ union ipaddr addr = { };
160+ socklen_t size;
161+ int fd = EOF;
162+ _Bool ipv6 = 1;
163+ const char *ip = NULL;
164+ unsigned short port = 0;
165+ char line[1024];
166+ int lineno = 0;
167+ FILE *fp;
168+ if (argc != 2)
169+ help("Please specify a configuration file.");
170+ fp = fopen(argv[1], "r");
171+ if (!fp)
172+ help("Can't open %s for reading.", argv[1]);
173+ memset(traps, 0, sizeof(traps));
174+ while (memset(line, 0, sizeof(line)), lineno++,
175+ fgets(line, sizeof(line) - 1, fp)) {
176+ char *cp = strchr(line, '\n');
177+ if (!cp)
178+ help("Line %u: Too long or truncated.", lineno);
179+ cp = strchr(line, '#');
180+ if (cp)
181+ *cp = '\0';
182+ normalize_line(line);
183+ if (!*line)
184+ continue;
185+ if (!default_action && !strncmp(line, "default ", 8))
186+ default_action = my_strdup(line + 8);
187+ else if (!ip && !strncmp(line, "listen_ip ", 10))
188+ ip = my_strdup(line + 10);
189+ else if (!port && !strncmp(line, "listen_port ", 12))
190+ port = atoi(line + 12);
191+ else if (!strncmp(line, "trap ", 5)) {
192+ int i;
193+ cp = strchr(line + 5, ' ');
194+ if (!cp)
195+ help("Line %u: A \"trap \" entry needs "
196+ "$sysrq and $magic arguments.", lineno);
197+ *cp++ = '\0';
198+ for (i = 0; cp[i]; i++) {
199+ const char c = cp[i];
200+ if (c > 0x20 && c < 0x7F && c != 0x5C)
201+ continue;
202+ help("Line %u: '%c' is an invalid character.",
203+ lineno, c);
204+ }
205+ i = num_traps++;
206+ if (i >= MAX_TRAPS)
207+ help("Line %u: Too many \"trap \" entries.",
208+ lineno);
209+ traps[i].magic = my_strdup(cp);
210+ traps[i].magic_len = strlen(traps[i].magic);
211+ traps[i].command = my_strdup(line + 5);
212+ traps[i].command_len = strlen(traps[i].command);
213+ } else {
214+ help("Line %u: Invalid line.", lineno);
215+ }
216+ }
217+ fclose(fp);
218+ if (!default_action && !num_traps)
219+ help("Neither \"default \" entry nor \"trap \" entry is given.");
220+ if (!default_action)
221+ default_action = my_strdup("");
222+ /* Open /proc/sysrq-trigger for writing. */
223+ sysrq_fd = open("/proc/sysrq-trigger", O_WRONLY);
224+ if (sysrq_fd == EOF)
225+ die("Can't open /proc/sysrq-trigger");
226+ /* Create the listener socket and configure it. */
227+ if (!ip || inet_pton(AF_INET, ip, &addr.ip4.sin_addr) != 1) {
228+ fd = socket(PF_INET6, SOCK_DGRAM, 0);
229+ /*
230+ * Give up if IPv6 address was requested but IPv6 socket is not
231+ * available.
232+ */
233+ if (fd == EOF && ip)
234+ die("Can't create IPv6 socket");
235+ }
236+ if (fd == EOF) {
237+ fd = socket(PF_INET, SOCK_DGRAM, 0);
238+ /* Give up if IPv4 socket is not available. */
239+ if (fd == EOF)
240+ die("Can't create IPv4 socket");
241+ ipv6 = 0;
242+ }
243+ socket_fd = fd;
244+ if (ipv6) {
245+ addr.ip6.sin6_family = AF_INET6;
246+ addr.ip6.sin6_port = htons(port);
247+ if (!ip)
248+ addr.ip6.sin6_addr = in6addr_any;
249+ else if (inet_pton(AF_INET6, ip, &addr.ip6.sin6_addr) != 1) {
250+ fprintf(stderr, "%s is an invalid IPv6 address\n", ip);
251+ exit(1);
252+ }
253+ } else {
254+ addr.ip4.sin_family = AF_INET;
255+ addr.ip4.sin_port = htons(port);
256+ if (!ip)
257+ addr.ip4.sin_addr.s_addr = htonl(INADDR_ANY);
258+ }
259+ ip = get_addr(ipv6, &addr);
260+ if (ipv6)
261+ port = ntohs(addr.ip6.sin6_port);
262+ else
263+ port = ntohs(addr.ip4.sin_port);
264+ size = ipv6 ? sizeof(addr.ip6) : sizeof(addr.ip4);
265+ if (bind(fd, (struct sockaddr *) &addr, size))
266+ die("Can't bind to ip=%s port=%u", ip, port);
267+ else if (getsockname(fd, (struct sockaddr *) &addr, &size))
268+ die("Can't get bound address");
269+ ip = get_addr(ipv6, &addr);
270+ if (ipv6)
271+ port = ntohs(addr.ip6.sin6_port);
272+ else
273+ port = ntohs(addr.ip4.sin_port);
274+ printf("Listening at ip=%s port=%u\n", ip, port);
275+ /* Close unused file descriptors. */
276+ for (fd = 0; fd < 1024; fd++)
277+ if (fd != sysrq_fd && fd != socket_fd)
278+ close(fd);
279+ /* Try to avoid page faults, but not required to be perfect. */
280+ mlockall(MCL_CURRENT);
281+}
282+
283+int main(int argc, char *argv[])
284+{
285+ char *pos;
286+ do_init(argc, argv);
287+ pos = default_action;
288+ while (1) {
289+ int ret_ignored = 0;
290+ static char buffer[1024] = { };
291+ struct pollfd pfd = { socket_fd, POLLIN, 0 };
292+ int i;
293+ int len = strtol(pos, &pos, 10);
294+ if (*pos == ' ')
295+ pos++;
296+ else
297+ len = -1; /* Negative value means no timeout. */
298+ switch (poll(&pfd, 1, len)) {
299+ case 0: /* No packet within timeout. */
300+ /* Let's start/continue default sysrq action. */
301+ while (*pos && *pos != ' ')
302+ ret_ignored += write(sysrq_fd, pos++, 1);
303+ continue;
304+ case EOF: /* poll() failed for some reason. */
305+ /* Have a nap and restart the default action. */
306+ sleep(1);
307+ pos = default_action;
308+ continue;
309+ }
310+ /* poll() says that a packet arrived. */
311+ len = recv(socket_fd, buffer, sizeof(buffer), MSG_DONTWAIT);
312+ /* Let's do on-demand sysrq if the packet contains magic. */
313+ for (i = 0; i < num_traps; i++) {
314+ const char *cp;
315+ if (traps[i].magic_len != len ||
316+ memcmp(traps[i].magic, buffer, len))
317+ continue;
318+ cp = traps[i].command;
319+ len = traps[i].command_len;
320+ for (i = 0; i < len; i++)
321+ ret_ignored += write(sysrq_fd, &cp[i], 1);
322+ break;
323+ }
324+ /* Restart the default action. */
325+ pos = default_action;
326+ }
327+ return 0;
328+}
--- branches/udpsysrqd/udpsysrqd.spec (nonexistent)
+++ branches/udpsysrqd/udpsysrqd.spec (revision 596)
@@ -0,0 +1,43 @@
1+Summary: A utility for triggering SysRq via UDP packets.
2+Name: udpsysrqd
3+Version: 1.0
4+Release: 1
5+License: GPLv2
6+Group: Applications/System
7+ExclusiveOS: Linux
8+Autoreqprov: no
9+Buildroot: %{_tmppath}/%{name}-%{version}-%{release}-buildroot
10+Conflicts: udpsysrqd < 1.0-1
11+
12+Source0: udpsysrqd.tar.gz
13+
14+%description
15+This package contains a utility for triggering SysRq via UDP packets.
16+
17+%prep
18+
19+%setup -q -n udpsysrqd
20+
21+%build
22+
23+make CFLAGS="-Wall $RPM_OPT_FLAGS"
24+
25+%install
26+
27+rm -rf $RPM_BUILD_ROOT
28+make INSTALLDIR=$RPM_BUILD_ROOT install
29+
30+%clean
31+
32+rm -rf $RPM_BUILD_ROOT
33+
34+%files
35+%defattr(-,root,root)
36+/usr/bin/udpsysrqd
37+%doc /usr/share/doc/udpsysrqd/README
38+%doc /usr/share/doc/udpsysrqd/COPYING
39+%doc /usr/share/doc/udpsysrqd/udpsysrqd.conf
40+
41+%changelog
42+* Thu Sep 13 2018 1.0-1
43+- Initial packaging.
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