1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
|
/*
* Exec external program to notify for an event
* Copyright (C) 2011 Unix Solutions Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License (COPYING file) for more details.
*
*/
// Needed for asprintf
#define _GNU_SOURCE 1
#include <stdlib.h>
#include <stdarg.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <ctype.h>
#include <pthread.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/mman.h>
#include "libfuncs/queue.h"
#include "notify.h"
#include "util.h"
struct npriv {
char ident[512];
char program[512];
char msg_id[512];
char text[512];
int sync; /* Wait for message to be delivered */
};
static void *do_notify(void *in) {
struct npriv *data = in;
struct npriv *shared = mmap(NULL, sizeof(struct npriv), PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANON, -1, 0);
if (!shared) {
perror("mmap");
goto OUT;
}
*shared = *data;
pid_t pid = fork();
if (pid==0) { // child process
char *args[] = { shared->program, shared->ident, NULL };
int e = 0;
unsigned int i, r;
char **env = calloc(32, sizeof(char *));
asprintf(&env[e++], "_TS=%ld" , time(NULL));
asprintf(&env[e++], "_IDENT=%s" , shared->ident);
asprintf(&env[e++], "_MESSAGE_ID=%s" , shared->msg_id);
asprintf(&env[e++], "_MESSAGE_TEXT=%s" , shared->text);
r = strlen(shared->msg_id);
for (i=0; i<r; i++) {
if (isalpha(shared->msg_id[i]))
shared->msg_id[i] = tolower(shared->msg_id[i]);
if (shared->msg_id[i] == '_')
shared->msg_id[i] = ' ';
}
asprintf(&env[e++], "_MESSAGE_MSG=%s" , shared->msg_id);
execve(args[0], args, env);
// We reach here only if there is an error.
fprintf(stderr, "execve('%s') failed: %s!\n", args[0], strerror(errno));
do {
free(env[e--]);
} while (e);
free(env);
exit(EXIT_FAILURE);
} else if (pid < 0) {
fprintf(stderr, "fork() failed: %s\n", strerror(errno));
} else {
waitpid(pid, NULL, 0);
}
munmap(shared, sizeof(struct npriv));
OUT:
free(data);
pthread_exit(EXIT_SUCCESS);
}
static void *notify_thread(void *data) {
struct notify *n = data;
set_thread_name("tsdec-notify");
while (1) {
struct npriv *np = queue_get(n->notifications); // Waits...
if (!np)
break;
pthread_t notifier; // The notifier frees the data
if (pthread_create(¬ifier, NULL, &do_notify, np) != 0) {
perror("pthread_create");
free(np);
} else {
if (np->sync)
pthread_join(notifier, NULL);
else
pthread_detach(notifier);
}
}
pthread_exit(EXIT_SUCCESS);
}
/* ======================================================================== */
struct notify *notify_alloc(struct ts *ts) {
unsigned int i;
if (!ts->ident || !ts->notify_program)
return NULL;
struct notify *n = calloc(1, sizeof(struct notify));
n->notifications = queue_new();
strncpy(n->ident, ts->ident, sizeof(n->ident) - 1);
n->ident[sizeof(n->ident) - 1] = '\0';
for (i=0; i<strlen(n->ident); i++) {
if (n->ident[i] == '/')
n->ident[i] = '-';
}
strncpy(n->program, ts->notify_program, sizeof(n->program) - 1);
n->program[sizeof(n->program) - 1] = '\0';
pthread_create(&n->thread, &ts->thread_attr , ¬ify_thread, n);
return n;
}
static void npriv_init_defaults(struct notify *n, struct npriv *np) {
strncpy(np->program, n->program, sizeof(np->program) - 1);
strncpy(np->ident, n->ident, sizeof(np->ident) - 1);
}
static void notify_func(struct ts *ts, int sync_msg, char *msg_id, char *msg_text) {
struct npriv *np;
if (!ts->notify)
return;
np = calloc(1, sizeof(struct npriv));
np->sync = sync_msg;
npriv_init_defaults(ts->notify, np);
strncpy(np->msg_id, msg_id, sizeof(np->ident) - 1);
np->msg_id[sizeof(np->ident) - 1] = 0;
strncpy(np->text, msg_text, sizeof(np->text) - 1);
np->text[sizeof(np->text) - 1] = 0;
queue_add(ts->notify->notifications, np);
}
#define MAX_MSG_TEXT 256
void notify(struct ts *ts, char *msg_id, char *text_fmt, ...) {
va_list args;
char msg_text[MAX_MSG_TEXT];
va_start(args, text_fmt);
vsnprintf(msg_text, sizeof(msg_text) - 1, text_fmt, args);
msg_text[sizeof(msg_text) - 1] = 0;
va_end(args);
notify_func(ts, 0, msg_id, msg_text);
}
void notify_sync(struct ts *ts, char *msg_id, char *text_fmt, ...) {
va_list args;
char msg_text[MAX_MSG_TEXT];
va_start(args, text_fmt);
vsnprintf(msg_text, sizeof(msg_text) - 1, text_fmt, args);
msg_text[sizeof(msg_text) - 1] = 0;
va_end(args);
notify_func(ts, 1, msg_id, msg_text);
}
void notify_free(struct notify **pn) {
struct notify *n = *pn;
if (n) {
queue_add(n->notifications, NULL);
pthread_join(n->thread, NULL);
queue_free(&n->notifications);
FREE(*pn);
}
}
|
