server.c 3.11 KB
Newer Older
Niels Möller's avatar
Niels Möller committed
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
/* server.c
 *
 */

#include "server.h"

#include "version.h"
#include "connection.h"
#include "abstract_io.h"
#include "read_line.h"
#include "read_packet.h"
#include "debug.h"
#include "format.h"
#include "werror.h"
#include "void.h"
#include "xalloc.h"

struct read_handler *make_server_read_line();
struct callback *make_server_close_handler();

Niels Möller's avatar
Niels Möller committed
21
static int server_initiate(struct fd_callback **c,
Niels Möller's avatar
Niels Möller committed
22
23
			   int fd)
{
Niels Möller's avatar
Niels Möller committed
24
25
  struct server_callback *closure = (struct server_callback *) *c;
  
Niels Möller's avatar
Niels Möller committed
26
27
  /* FIXME: Should pass a key exchange handler, not NULL! */
  struct ssh_connection *connection = make_ssh_connection(NULL);
Niels Möller's avatar
Niels Möller committed
28
29
30
31
32
33
34
  struct abstract_write *write =
    io_read_write(closure->backend, fd,
		  make_server_read_line(),
		  closure->block_size,
		  make_server_close_handler());
  
  connection->server_version
Niels Möller's avatar
Niels Möller committed
35
    = ssh_format("SSH-%lz-%lz %lz",
Niels Möller's avatar
Niels Möller committed
36
37
38
		 PROTOCOL_VERSION,
		 SOFTWARE_SERVER_VERSION,
		 closure->id_comment);
Niels Möller's avatar
Niels Möller committed
39
40

  return A_WRITE(write, ssh_format("%lS\r\n", connection->server_version));
Niels Möller's avatar
Niels Möller committed
41
42
43
44
45
46
47
48
}

struct server_line_handler
{
  struct line_handler super;
  struct ssh_connection *connection;
};

Niels Möller's avatar
Niels Möller committed
49
static struct read_handler *do_line(struct line_handler **h,
Niels Möller's avatar
Niels Möller committed
50
51
52
				    UINT32 length,
				    UINT8 *line)
{
Niels Möller's avatar
Niels Möller committed
53
54
  struct server_line_handler *closure = (struct server_line_handler *) *h;
  
Niels Möller's avatar
Niels Möller committed
55
56
57
58
59
60
  if ( (length >= 4) && !memcmp(line, "SSH-", 4))
    {
      /* Parse and remember format string */
      if ((length >= 8) && !memcmp(line + 4, "2.0-", 4))
	{
	  struct read_handler *new
Niels Möller's avatar
Niels Möller committed
61
	    = make_read_packet(make_packet_debug(&closure->connection->super,
Niels Möller's avatar
Niels Möller committed
62
						 stderr),
Niels Möller's avatar
Niels Möller committed
63
64
65
			       closure->connection->max_packet);
	  
	  closure->connection->client_version
Niels Möller's avatar
Niels Möller committed
66
	    = ssh_format("%ls", length, line);
Niels Möller's avatar
Niels Möller committed
67

Niels Möller's avatar
Niels Möller committed
68
69
70
71
72
	  verbose("Client version: ");
	  verbose_safe(closure->connection->client_version->length,
		       closure->connection->client_version->data);
	  verbose("\n");
	  
Niels Möller's avatar
Niels Möller committed
73
	  /* FIXME: Cleanup properly. */
Niels Möller's avatar
Niels Möller committed
74
	  lsh_free(closure);
Niels Möller's avatar
Niels Möller committed
75
76
77
78
79
80
81
82
83

	  return new;
	}
      else
	{
	  werror("Unsupported protocol version: ");
	  werror_safe(length, line);
	  werror("\n");

Niels Möller's avatar
Niels Möller committed
84
85
86
87
	  /* FIXME: Clean up properly */
	  lsh_free(closure);
	  *h = 0;
		  
Niels Möller's avatar
Niels Möller committed
88
89
90
91
92
93
94
95
96
97
98
99
	  return 0;
	}
    }
  else
    {
      /* Display line */
      werror_safe(length, line);

      /* Read next line */
      return 0;
    }
}
Niels Möller's avatar
Niels Möller committed
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

struct read_handler *make_server_read_line(struct ssh_connection *s)
{
  struct server_line_handler *closure
    = xalloc(sizeof(struct server_line_handler));
  
  closure->super.handler = do_line;
  closure->connection = s;
  
  return make_read_line(&closure->super);
}

struct fd_callback *make_server_callback(struct io_backend *b,
					 char *comment,
					 UINT32 block_size)
					 
{
  struct server_callback *connected = xalloc(sizeof(struct server_callback));

  connected->super.f = server_initiate;
  connected->backend = b;
  connected->block_size = block_size;
  connected->id_comment = comment;
  
  return &connected->super;
}

static int server_die(struct callback *closure)
{
  werror("Connection died.\n");
  /* FIXME: Cleanup properly. */
  return 0;  /* Ignored */
}

struct callback *make_server_close_handler()
{
  struct callback *c = xalloc(sizeof(struct callback));

  c->f = server_die;

  return c;
}