summary refs log tree commit diff
path: root/daemon.h
blob: 0dcf4de2dfa3fbbe71f9fea1d2a3f26c20aba7c2 (plain) (blame)
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
/* Copyright (C) 2020  C. McEnroe <june@causal.agency>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <errno.h>
#include <grp.h>
#include <pwd.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#include <unistd.h>

typedef unsigned char byte;

extern struct Prepend {
	size_t cap, len;
	char **commands;
} prepend;

static inline void prependClear(void) {
	for (size_t i = 0; i < prepend.len; ++i) {
		free(prepend.commands[i]);
	}
	prepend.len = 0;
}
static inline int prependAdd(const char *command) {
	if (prepend.len == prepend.cap) {
		size_t cap = (prepend.cap ? prepend.cap * 2 : 8);
		void *ptr = realloc(prepend.commands, sizeof(*prepend.commands) * cap);
		if (!ptr) return -1;
		prepend.cap = cap;
		prepend.commands = ptr;
	}
	prepend.commands[prepend.len] = strdup(command);
	if (!prepend.commands[prepend.len]) return -1;
	prepend.len++;
	return 0;
}

enum { LineCap = 512 };
struct Line {
	size_t len;
	char buf[LineCap];
};

static inline const char *lineFlush(struct Line *line) {
	if (!line->len) return NULL;
	line->buf[line->len++] = '\0';
	return line->buf;
}

static inline const char *lineRead(struct Line *line, int fd) {
	char *nul = memchr(line->buf, '\0', line->len);
	if (nul) {
		nul++;
		line->len -= nul - line->buf;
		memmove(line->buf, nul, line->len);
	}

	size_t cap = sizeof(line->buf) - line->len - 1;
	if (!cap) return lineFlush(line);

	ssize_t len = read(fd, &line->buf[line->len], cap);
	if (len < 0 && errno != EAGAIN) return NULL;
	if (len > 0) line->len += len;

	char *nl = memchr(line->buf, '\n', line->len);
	if (nl) {
		*nl = '\0';
		return line->buf;
	} else {
		errno = EAGAIN;
		return NULL;
	}
}

enum {
	SHELL,
	PATH,
	LOGNAME,
	USER,
	HOME,
	EnvironNull,
	EnvironLen,
};

extern const char *serviceDir;
extern uid_t serviceUID;
extern gid_t serviceGID;
extern char *serviceEnviron[EnvironLen];

enum State {
	Stop,
	Start,
	Restart,
};

struct Service {
	char *name;
	char *command;
	enum State intent;
	enum State state;
	pid_t pid;
	int outPipe[2];
	int errPipe[2];
	struct Line outLine;
	struct Line errLine;
	struct timespec startTime;
	struct timespec restartInterval;
	struct timespec restartDeadline;
};

extern struct Services {
	size_t cap, len;
	struct Service *ptr;
} services;

int serviceAdd(const char *name, const char *command);
void serviceStatus(struct Service *service);
void serviceStart(struct Service *service);
void serviceStop(struct Service *service);
void serviceRestart(struct Service *service);
void serviceSignal(struct Service *service, int signal);
void serviceRead(struct Service *service);
void serviceReap(pid_t pid, int status);

extern char configError[];
int configParse(const char *path);

struct Set256 {
	uint32_t bits[8];
};
static inline void setClear(struct Set256 *set) {
	for (int i = 0; i < 8; ++i) set->bits[i] = 0;
}
static inline void setAdd(struct Set256 *set, byte x) {
	set->bits[x / 32] |= 1 << (uint32_t)(x & 31);
}
static inline uint32_t setTest(const struct Set256 *set, byte x) {
	return set->bits[x / 32] & (1 << (uint32_t)(x & 31));
}

extern struct Set256 stopExits;
extern struct timespec restartInterval;
extern struct timespec resetInterval;