about summary refs log tree commit diff
path: root/bounce.h
blob: d94eae48c308e80dbc967d6fd9a17aea69585a17 (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
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
192
193
194
/* Copyright (C) 2019  C. McEnroe <june@causal.agency>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <tls.h>

#include "compat.h"

#ifndef CERTBOT_PATH
#define CERTBOT_PATH "/usr/local/etc/letsencrypt"
#endif

#define SOURCE_URL "https://code.causal.agency/june/pounce"
#define ORIGIN "irc.invalid"

#define BIT(x) x##Bit, x = 1 << x##Bit, x##Bit_ = x##Bit
#define ARRAY_LEN(a) (sizeof(a) / sizeof(a[0]))

typedef unsigned char byte;

enum { ParamCap = 15 };
struct Message {
	char *origin;
	char *cmd;
	char *params[ParamCap];
};

static inline struct Message parse(char *line) {
	struct Message msg = {0};
	if (line[0] == ':') msg.origin = 1 + strsep(&line, " ");
	msg.cmd = strsep(&line, " ");
	for (size_t i = 0; line && i < ParamCap; ++i) {
		if (line[0] == ':') {
			msg.params[i] = &line[1];
			break;
		}
		msg.params[i] = strsep(&line, " ");
	}
	return msg;
}

#define ENUM_CAP \
	X("account-notify", CapAccountNotify) \
	X("away-notify", CapAwayNotify) \
	X("chghost", CapChghost) \
	X("extended-join", CapExtendedJoin) \
	X("invite-notify", CapInviteNotify) \
	X("sasl", CapSASL) \
	X("server-time", CapServerTime) \
	X("userhost-in-names", CapUserhostInNames) \
	X("", CapUnsupported)

enum Cap {
#define X(name, id) BIT(id),
	ENUM_CAP
#undef X
};

static const char *CapNames[] = {
#define X(name, id) [id##Bit] = name,
	ENUM_CAP
#undef X
};

static inline enum Cap capParse(const char *list) {
	enum Cap caps = 0;
	while (*list) {
		enum Cap cap = CapUnsupported;
		size_t len = strcspn(list, " ");
		for (size_t i = 0; i < ARRAY_LEN(CapNames); ++i) {
			if (len != strlen(CapNames[i])) continue;
			if (strncmp(list, CapNames[i], len)) continue;
			cap = 1 << i;
			break;
		}
		caps |= cap;
		list += len;
		if (*list) list++;
	}
	return caps;
}

static inline const char *capList(enum Cap caps) {
	static char buf[1024];
	buf[0] = '\0';
	for (size_t i = 0; i < ARRAY_LEN(CapNames); ++i) {
		if (caps & (1 << i)) {
			if (buf[0]) strlcat(buf, " ", sizeof(buf));
			strlcat(buf, CapNames[i], sizeof(buf));
		}
	}
	return buf;
}

bool verbose;

void ringAlloc(size_t len);
void ringProduce(const char *line);
size_t ringConsumer(const char *name);
size_t ringDiff(size_t consumer);
const char *ringPeek(time_t *time, size_t consumer);
const char *ringConsume(time_t *time, size_t consumer);
void ringInfo(void);
int ringSave(FILE *file);
void ringLoad(FILE *file);

void localConfig(FILE *cert, FILE *priv);
size_t localBind(int fds[], size_t cap, const char *host, const char *port);
size_t localUnix(int fds[], size_t cap, const char *path);
struct tls *localAccept(int *fd, int bind);

void serverConfig(bool insecure, const char *cert, const char *priv);
int serverConnect(const char *host, const char *port);
void serverRecv(void);
void serverSend(const char *ptr, size_t len);
void serverFormat(const char *format, ...)
	__attribute__((format(printf, 1, 2)));

char *clientPass;
char *clientAway;
struct Client *clientAlloc(struct tls *tls);
void clientFree(struct Client *client);
bool clientError(const struct Client *client);
void clientRecv(struct Client *client);
void clientSend(struct Client *client, const char *ptr, size_t len);
void clientFormat(struct Client *client, const char *format, ...)
	__attribute__((format(printf, 2, 3)));
size_t clientDiff(const struct Client *client);
void clientConsume(struct Client *client);

bool stateJoinNames;
enum Cap stateCaps;
void stateLogin(
	const char *pass, bool sasl, const char *plain,
	const char *nick, const char *user, const char *real
);
bool stateReady(void);
void stateParse(char *line);
void stateSync(struct Client *client);
const char *stateNick(void);
const char *stateEcho(void);

struct option;
int getopt_config(
	int argc, char *const *argv,
	const char *optstring, const struct option *longopts, int *longindex
);

static const char Base64[64] = {
	"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
};

#define BASE64_SIZE(len) (1 + ((len) + 2) / 3 * 4)

static inline void base64(char *dst, const byte *src, size_t len) {
	size_t i = 0;
	while (len > 2) {
		dst[i++] = Base64[0x3F & (src[0] >> 2)];
		dst[i++] = Base64[0x3F & (src[0] << 4 | src[1] >> 4)];
		dst[i++] = Base64[0x3F & (src[1] << 2 | src[2] >> 6)];
		dst[i++] = Base64[0x3F & src[2]];
		src += 3;
		len -= 3;
	}
	if (len) {
		dst[i++] = Base64[0x3F & (src[0] >> 2)];
		if (len > 1) {
			dst[i++] = Base64[0x3F & (src[0] << 4 | src[1] >> 4)];
			dst[i++] = Base64[0x3F & (src[1] << 2)];
		} else {
			dst[i++] = Base64[0x3F & (src[0] << 4)];
			dst[i++] = '=';
		}
		dst[i++] = '=';
	}
	dst[i] = '\0';
}