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Commit | Line | Data |
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95c4aff2 | 1 | /* |
896014f4 DL |
2 | * watchfrr CLI functions. |
3 | * | |
4 | * Copyright (C) 2016 David Lamparter for NetDEF, Inc. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License along | |
17 | * with this program; see the file COPYING; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
95c4aff2 DL |
19 | */ |
20 | ||
21 | #include <zebra.h> | |
22 | #include <sys/wait.h> | |
23 | ||
24 | #include "memory.h" | |
25 | #include "log.h" | |
26 | #include "vty.h" | |
27 | #include "command.h" | |
28 | ||
9473e340 | 29 | #include "watchfrr.h" |
95c4aff2 DL |
30 | |
31 | pid_t integrated_write_pid; | |
32 | static int integrated_result_fd; | |
33 | ||
a6810074 DL |
34 | DEFUN(config_write_integrated, |
35 | config_write_integrated_cmd, | |
36 | "write integrated", | |
37 | "Write running configuration to memory, network, or terminal\n" | |
e20dc2ba | 38 | "Write integrated all-daemon frr.conf file\n") |
95c4aff2 DL |
39 | { |
40 | pid_t child; | |
41 | sigset_t oldmask, sigmask; | |
42 | ||
470bc619 QY |
43 | const char *e_inprog = "Configuration write already in progress."; |
44 | const char *e_dmn = "Not all daemons are up, cannot write config."; | |
45 | ||
95c4aff2 | 46 | if (integrated_write_pid != -1) { |
470bc619 | 47 | vty_out(vty, "%% %s\n", e_inprog); |
95c4aff2 DL |
48 | return CMD_WARNING; |
49 | } | |
50 | ||
470bc619 QY |
51 | /* check that all daemons are up before clobbering config */ |
52 | if (!check_all_up()) { | |
53 | vty_out(vty, "%% %s\n", e_dmn); | |
54 | /* | |
55 | * vtysh interprets this return value to mean that it should | |
56 | * not try to write the config itself | |
57 | */ | |
58 | return CMD_WARNING_CONFIG_FAILED; | |
59 | } | |
60 | ||
95c4aff2 DL |
61 | fflush(stdout); |
62 | fflush(stderr); | |
63 | ||
64 | /* need to temporarily block SIGCHLD because it could arrive between | |
65 | * fork() call and setting the integrated_write_pid variable. This | |
66 | * would mean the completion call gets lost and this hangs forever. | |
67 | */ | |
68 | sigemptyset(&oldmask); | |
69 | sigemptyset(&sigmask); | |
70 | sigaddset(&sigmask, SIGCHLD); | |
71 | sigprocmask(SIG_BLOCK, &sigmask, &oldmask); | |
72 | ||
73 | child = fork(); | |
74 | if (child == -1) { | |
d62a17ae | 75 | vty_out(vty, "%% configuration write fork() failed: %s.\n", |
96ade3ed | 76 | safe_strerror(errno)); |
95c4aff2 DL |
77 | sigprocmask(SIG_SETMASK, &oldmask, NULL); |
78 | return CMD_WARNING; | |
79 | } | |
80 | if (child != 0) { | |
d62a17ae | 81 | /* note: the VTY won't write a command return value to vtysh; |
82 | * the | |
83 | * session temporarily enters an intentional "hang" state. This | |
84 | * is | |
a6810074 | 85 | * to make sure latency in vtysh doing the config write (several |
d62a17ae | 86 | * seconds is not rare to see) does not interfere with |
87 | * watchfrr's | |
a6810074 DL |
88 | * supervisor job. |
89 | * | |
d62a17ae | 90 | * The fd is duplicated here so we don't need to hold a vty |
91 | * pointer | |
a6810074 DL |
92 | * (which could become invalid in the meantime). |
93 | */ | |
95c4aff2 DL |
94 | integrated_write_pid = child; |
95 | integrated_result_fd = dup(vty->wfd); | |
96 | sigprocmask(SIG_SETMASK, &oldmask, NULL); | |
97 | return CMD_SUSPEND; | |
98 | } | |
99 | ||
100 | /* redirect stdout/stderr to vty session. Note vty->wfd is marked | |
101 | * CLOEXEC, but dup2 will clear that flag. */ | |
102 | dup2(vty->wfd, 1); | |
103 | dup2(vty->wfd, 2); | |
104 | ||
105 | /* don't allow the user to pass parameters, we're root here! | |
106 | * should probably harden vtysh at some point too... */ | |
107 | execl(VTYSH_BIN_PATH, "vtysh", "-w", NULL); | |
108 | ||
109 | /* unbuffered write; we just messed with stdout... */ | |
110 | char msg[512]; | |
d62a17ae | 111 | snprintf(msg, sizeof(msg), "error executing %s: %s\n", VTYSH_BIN_PATH, |
112 | safe_strerror(errno)); | |
95c4aff2 DL |
113 | write(1, msg, strlen(msg)); |
114 | exit(1); | |
115 | } | |
116 | ||
dff13b6f DW |
117 | DEFUN_NOSH (show_debugging_watchfrr, |
118 | show_debugging_watchfrr_cmd, | |
119 | "show debugging [watchfrr]", | |
120 | SHOW_STR | |
121 | DEBUG_STR | |
122 | WATCHFRR_STR) | |
123 | { | |
124 | return CMD_SUCCESS; | |
125 | } | |
126 | ||
95c4aff2 DL |
127 | void integrated_write_sigchld(int status) |
128 | { | |
d62a17ae | 129 | uint8_t reply[4] = {0, 0, 0, CMD_WARNING}; |
95c4aff2 DL |
130 | |
131 | if (WIFEXITED(status)) { | |
132 | zlog_info("configuration write completed with exit code %d", | |
a6810074 | 133 | WEXITSTATUS(status)); |
95c4aff2 DL |
134 | reply[3] = WEXITSTATUS(status); |
135 | } else if (WIFSIGNALED(status)) { | |
136 | zlog_warn("configuration write terminated by signal %d", | |
a6810074 | 137 | WTERMSIG(status)); |
95c4aff2 DL |
138 | } else { |
139 | zlog_warn("configuration write terminated"); | |
140 | } | |
141 | ||
c10c5926 DL |
142 | if (reply[3] != CMD_SUCCESS) { |
143 | /* failure might be silent in vtysh without this */ | |
144 | static const char msg[] = "% Configuration write failed.\n"; | |
145 | write(integrated_result_fd, msg, strlen(msg)); | |
146 | } | |
147 | ||
95c4aff2 DL |
148 | /* don't care about failures here, if the connection is broken the |
149 | * return value will just be lost. */ | |
150 | write(integrated_result_fd, reply, sizeof(reply)); | |
151 | close(integrated_result_fd); | |
152 | ||
153 | integrated_write_pid = -1; | |
154 | } | |
155 | ||
9473e340 | 156 | void watchfrr_vty_init(void) |
95c4aff2 DL |
157 | { |
158 | integrated_write_pid = -1; | |
159 | install_element(ENABLE_NODE, &config_write_integrated_cmd); | |
dff13b6f DW |
160 | install_element(ENABLE_NODE, &show_debugging_watchfrr_cmd); |
161 | install_element(CONFIG_NODE, &show_debugging_watchfrr_cmd); | |
95c4aff2 | 162 | } |