2 * watchfrr CLI functions.
4 * Copyright (C) 2016 David Lamparter for NetDEF, Inc.
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.
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.
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
31 pid_t integrated_write_pid
;
32 static int integrated_result_fd
;
34 DEFUN(config_write_integrated
,
35 config_write_integrated_cmd
,
37 "Write running configuration to memory, network, or terminal\n"
38 "Write integrated all-daemon frr.conf file\n")
41 sigset_t oldmask
, sigmask
;
43 const char *e_inprog
= "Configuration write already in progress.";
44 const char *e_dmn
= "Not all daemons are up, cannot write config.";
46 if (integrated_write_pid
!= -1) {
47 vty_out(vty
, "%% %s\n", e_inprog
);
51 /* check that all daemons are up before clobbering config */
52 if (!check_all_up()) {
53 vty_out(vty
, "%% %s\n", e_dmn
);
55 * vtysh interprets this return value to mean that it should
56 * not try to write the config itself
58 return CMD_WARNING_CONFIG_FAILED
;
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.
68 sigemptyset(&oldmask
);
69 sigemptyset(&sigmask
);
70 sigaddset(&sigmask
, SIGCHLD
);
71 sigprocmask(SIG_BLOCK
, &sigmask
, &oldmask
);
75 vty_out(vty
, "%% configuration write fork() failed: %s.\n",
76 safe_strerror(errno
));
77 sigprocmask(SIG_SETMASK
, &oldmask
, NULL
);
81 /* note: the VTY won't write a command return value to vtysh;
83 * session temporarily enters an intentional "hang" state. This
85 * to make sure latency in vtysh doing the config write (several
86 * seconds is not rare to see) does not interfere with
90 * The fd is duplicated here so we don't need to hold a vty
92 * (which could become invalid in the meantime).
94 integrated_write_pid
= child
;
95 integrated_result_fd
= dup(vty
->wfd
);
96 sigprocmask(SIG_SETMASK
, &oldmask
, NULL
);
100 /* redirect stdout/stderr to vty session. Note vty->wfd is marked
101 * CLOEXEC, but dup2 will clear that flag. */
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
);
109 /* unbuffered write; we just messed with stdout... */
111 snprintf(msg
, sizeof(msg
), "error executing %s: %s\n", VTYSH_BIN_PATH
,
112 safe_strerror(errno
));
113 write(1, msg
, strlen(msg
));
117 DEFUN_NOSH (show_debugging_watchfrr
,
118 show_debugging_watchfrr_cmd
,
119 "show debugging [watchfrr]",
127 void integrated_write_sigchld(int status
)
129 uint8_t reply
[4] = {0, 0, 0, CMD_WARNING
};
131 if (WIFEXITED(status
)) {
132 zlog_info("configuration write completed with exit code %d",
133 WEXITSTATUS(status
));
134 reply
[3] = WEXITSTATUS(status
);
135 } else if (WIFSIGNALED(status
)) {
136 zlog_warn("configuration write terminated by signal %d",
139 zlog_warn("configuration write terminated");
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
));
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
);
153 integrated_write_pid
= -1;
156 void watchfrr_vty_init(void)
158 integrated_write_pid
= -1;
159 install_element(ENABLE_NODE
, &config_write_integrated_cmd
);
160 install_element(ENABLE_NODE
, &show_debugging_watchfrr_cmd
);
161 install_element(CONFIG_NODE
, &show_debugging_watchfrr_cmd
);