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
195
196
197
198
199
200
201
202
203
204
205
206
|
/* ISC license. */
#include <unistd.h>
#include <errno.h>
#include <bearssl.h>
#include <skalibs/error.h>
#include <skalibs/strerr2.h>
#include <skalibs/tai.h>
#include <skalibs/iopause.h>
#include <skalibs/djbunix.h>
#include <s6-networking/sbearssl.h>
#include "sbearssl-internal.h"
void sbearssl_run (br_ssl_engine_context *ctx, int *fds, tain_t const *tto, uint32_t options, unsigned int verbosity, sbearssl_handshake_cb_t_ref cb, sbearssl_handshake_cb_context_t *cbarg)
{
iopause_fd x[4] ;
unsigned int xindex[4] ;
int markedforflush = 0 ;
int handshake_done = 0 ;
if (ndelay_on(fds[0]) < 0
|| ndelay_on(fds[1]) < 0
|| ndelay_on(fds[2]) < 0
|| ndelay_on(fds[3]) < 0)
strerr_diefu1sys(111, "set fds non-blocking") ;
for (;;)
{
tain_t deadline ;
unsigned int j = 0 ;
unsigned int state = br_ssl_engine_current_state(ctx) ;
int r ;
if (state & BR_SSL_CLOSED)
{
r = br_ssl_engine_last_error(ctx) ;
if (r) strerr_diefu2x(98, "establish or maintain SSL connection to peer: ", sbearssl_error_str(r)) ;
break ;
}
if (fds[0] >= 0 && state & BR_SSL_SENDAPP)
{
x[j].fd = fds[0] ;
x[j].events = IOPAUSE_READ ;
xindex[0] = j++ ;
if (!handshake_done)
{
if (!(*cb)(ctx, cbarg))
strerr_diefu1sys(111, "post-handshake callback failed") ;
handshake_done = 1 ;
}
}
else xindex[0] = 4 ;
if (fds[1] >= 0 && state & BR_SSL_RECVAPP)
{
x[j].fd = fds[1] ;
x[j].events = IOPAUSE_WRITE ;
xindex[1] = j++ ;
}
else xindex[1] = 4 ;
if (fds[2] >= 0 && state & BR_SSL_RECVREC)
{
x[j].fd = fds[2] ;
x[j].events = IOPAUSE_READ ;
xindex[2] = j++ ;
}
else xindex[2] = 4 ;
if (fds[3] >= 0 && state & BR_SSL_SENDREC)
{
x[j].fd = fds[3] ;
x[j].events = IOPAUSE_WRITE ;
xindex[3] = j++ ;
}
else xindex[3] = 4 ;
if (xindex[0] == 4 && xindex[1] == 4 && xindex[3] == 4 && handshake_done) break ;
tain_add_g(&deadline, fds[0] >= 0 && fds[2] >= 0 && state & (BR_SSL_SENDAPP | BR_SSL_RECVREC) ? tto : &tain_infinite_relative) ;
r = iopause_g(x, j, &deadline) ;
if (r < 0) strerr_diefu1sys(111, "iopause") ;
else if (!r) break ;
while (j--)
if (x[j].revents & IOPAUSE_EXCEPT)
x[j].revents |= IOPAUSE_READ | IOPAUSE_WRITE ;
/* Flush to local */
if (state & BR_SSL_RECVAPP && xindex[1] < 4 && x[xindex[1]].events & x[xindex[1]].revents & IOPAUSE_WRITE)
{
size_t len ;
unsigned char const *s = br_ssl_engine_recvapp_buf(ctx, &len) ;
size_t w = allwrite(fds[1], (char const *)s, len) ;
if (!w)
{
if (!error_isagain(errno))
strerr_diefu1sys(111, "write to application") ;
}
else
{
br_ssl_engine_recvapp_ack(ctx, w) ;
if (fds[2] < 0 && w == len)
{
fd_close(fds[1]) ; fds[1] = -1 ;
}
state = br_ssl_engine_current_state(ctx) ;
}
}
/* Flush to remote */
if (state & BR_SSL_SENDREC && xindex[3] < 4 && x[xindex[3]].events & x[xindex[3]].revents & IOPAUSE_WRITE)
{
size_t len ;
unsigned char const *s = br_ssl_engine_sendrec_buf(ctx, &len) ;
size_t w = allwrite(fds[3], (char const *)s, len) ;
if (!w)
{
if (!error_isagain(errno))
strerr_diefu1sys(111, "write to peer") ;
}
else
{
br_ssl_engine_sendrec_ack(ctx, w) ;
if (fds[0] < 0 && w == len)
{
if (options & 1)
{
fd_shutdown(fds[3], 1) ;
fd_close(fds[3]) ; fds[3] = -1 ;
}
else br_ssl_engine_close(ctx) ;
}
state = br_ssl_engine_current_state(ctx) ;
}
}
/* Fill from local */
if (state & BR_SSL_SENDAPP && xindex[0] < 4 && x[xindex[0]].events & IOPAUSE_READ && (markedforflush || x[xindex[0]].revents & IOPAUSE_READ))
{
size_t len ;
unsigned char *s = br_ssl_engine_sendapp_buf(ctx, &len) ;
size_t w = allread(fds[0], (char *)s, len) ;
if (!w)
{
br_ssl_engine_flush(ctx, 0) ;
markedforflush = 0 ;
if (!error_isagain(errno))
{
fd_close(fds[0]) ; fds[0] = -1 ;
if (!br_ssl_engine_sendrec_buf(ctx, &len))
{
if (options & 1)
{
fd_shutdown(fds[3], 1) ;
fd_close(fds[3]) ; fds[3] = -1 ;
}
else br_ssl_engine_close(ctx) ;
}
}
}
else
{
br_ssl_engine_sendapp_ack(ctx, w) ;
if (w == len) markedforflush = 1 ;
else
{
br_ssl_engine_flush(ctx, 0) ;
markedforflush = 0 ;
}
}
state = br_ssl_engine_current_state(ctx) ;
}
/* Fill from remote */
if (state & BR_SSL_RECVREC && xindex[2] < 4 && x[xindex[2]].events & x[xindex[2]].revents & IOPAUSE_READ)
{
size_t len ;
unsigned char *s = br_ssl_engine_recvrec_buf(ctx, &len) ;
size_t w = allread(fds[2], (char *)s, len) ;
if (!w)
{
if (!error_isagain(errno))
{
if (options & 1) fd_shutdown(fds[2], 0) ;
fd_close(fds[2]) ; fds[2] = -1 ;
if (fds[1] >= 0 && !br_ssl_engine_recvapp_buf(ctx, &len))
{
fd_close(fds[1]) ; fds[1] = -1 ;
}
}
}
else br_ssl_engine_recvrec_ack(ctx, w) ;
}
}
_exit(0) ;
}
|
