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
|
#define _GNU_SOURCE
#include "proto.h"
#include <dirent.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/un.h>
#include <unistd.h>
#define HDR MSG_HDR
void msg_reader_init(msg_reader_t *r) {
memset(r, 0, sizeof *r);
r->cap = 65536;
r->buf = malloc(r->cap);
}
void msg_reader_free(msg_reader_t *r) {
free(r->buf);
free(r->msg);
memset(r, 0, sizeof *r);
}
void msg_reader_feed(msg_reader_t *r, const uint8_t *data, size_t len) {
if (r->len + len > r->cap) {
while (r->cap < r->len + len) r->cap *= 2;
r->buf = realloc(r->buf, r->cap);
}
memcpy(r->buf + r->len, data, len);
r->len += len;
}
bool msg_reader_next(msg_reader_t *r, msg_t *out) {
if (r->len < HDR) return false;
uint32_t len = (uint32_t)r->buf[1] << 24 | (uint32_t)r->buf[2] << 16 |
(uint32_t)r->buf[3] << 8 | r->buf[4];
if (r->len < HDR + (size_t)len) return false;
/* Lift the payload out before compacting the buffer, so the caller's pointer
* does not alias bytes we are about to move. Valid until the next call. */
if (len + 1 > r->msg_cap) {
r->msg_cap = len + 1;
r->msg = realloc(r->msg, r->msg_cap);
}
if (len) memcpy(r->msg, r->buf + HDR, len);
r->msg[len] = 0; /* JSON payloads want a terminator */
out->type = r->buf[0];
out->len = len;
out->data = r->msg;
size_t total = HDR + (size_t)len;
memmove(r->buf, r->buf + total, r->len - total);
r->len -= total;
return true;
}
int msg_send(int fd, uint8_t type, const void *data, size_t len) {
uint8_t hdr[HDR] = {type, (uint8_t)(len >> 24), (uint8_t)(len >> 16),
(uint8_t)(len >> 8), (uint8_t)len};
#ifdef _WIN32
/* No sendmsg: the two buffers are simply sent in order. The gather was only
* ever an optimisation -- what matters is that the header and its payload
* reach the socket as one contiguous stream, which sequential sends on a
* stream socket also guarantee. */
const void *parts[2] = {hdr, data};
size_t lens[2] = {HDR, len};
for (int i = 0; i < 2; i++) {
size_t off = 0;
while (off < lens[i]) {
ssize_t w = sl_write(fd, (const char *)parts[i] + off, lens[i] - off);
if (w < 0) {
if (errno == EINTR || errno == EAGAIN) continue;
return -1;
}
off += (size_t)w;
}
}
return 0;
#else
struct iovec iov[2] = {{hdr, HDR}, {(void *)data, len}};
size_t total = HDR + len, sent = 0;
while (sent < total) {
struct msghdr mh = {0};
struct iovec cur[2];
size_t n = 0;
size_t off = sent;
for (int i = 0; i < 2; i++) {
size_t l = iov[i].iov_len;
if (off >= l) {
off -= l;
continue;
}
cur[n].iov_base = (char *)iov[i].iov_base + off;
cur[n].iov_len = l - off;
off = 0;
n++;
}
mh.msg_iov = cur;
mh.msg_iovlen = n;
ssize_t w = sendmsg(fd, &mh, MSG_NOSIGNAL);
if (w < 0) {
if (errno == EINTR) continue;
return -1;
}
sent += (size_t)w;
}
return 0;
#endif
}
static int session_dir(char *out, size_t cap) {
#ifdef _WIN32
/* Per-user and non-roaming, which is what LOCALAPPDATA is for: a session
* socket is machine-local by definition and must not follow a roaming
* profile to another host. */
const char *base = getenv("LOCALAPPDATA");
if (!base || !*base) base = getenv("TEMP");
if (!base || !*base) return -1;
snprintf(out, cap, "%s/slosh", base);
for (char *p = out; *p; p++)
if (*p == '\\') *p = '/';
#else
const char *run = getenv("XDG_RUNTIME_DIR");
if (run && *run)
snprintf(out, cap, "%s/slosh", run);
else
snprintf(out, cap, "/tmp/slosh-%u", (unsigned)getuid());
#endif
if (mkdir(out, 0700) != 0 && errno != EEXIST) return -1;
return 0;
}
int session_socket_path(const char *name, char *out, size_t cap) {
char dir[512];
if (session_dir(dir, sizeof dir) != 0) return -1;
snprintf(out, cap, "%s/%s.sock", dir, name);
return 0;
}
int session_log_path(const char *name, char *out, size_t cap) {
char dir[512];
if (session_dir(dir, sizeof dir) != 0) return -1;
snprintf(out, cap, "%s/%s.log", dir, name);
return 0;
}
size_t session_list(char ***out_names) {
char dir[512];
if (session_dir(dir, sizeof dir) != 0) return 0;
DIR *d = opendir(dir);
if (!d) return 0;
char **names = NULL;
size_t n = 0;
struct dirent *e;
while ((e = readdir(d))) {
size_t l = strlen(e->d_name);
if (l < 6 || strcmp(e->d_name + l - 5, ".sock") != 0) continue;
names = realloc(names, (n + 1) * sizeof *names);
names[n] = strndup(e->d_name, l - 5);
n++;
}
closedir(d);
*out_names = names;
return n;
}
|
