libssh-rs-sys 0.2.6

Native bindings to the libssh library
Documentation 
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

/*
 * callbacks.c - callback functions
 *
 * This file is part of the SSH Library
 *
 * Copyright (c) 2009-2013  by Andreas Schneider <asn@cryptomilk.org>
 *
 * The SSH Library is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or (at your
 * option) any later version.
 *
 * The SSH Library 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 Lesser General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with the SSH Library; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 * MA 02111-1307, USA.
 */

#include "config.h"

#include "libssh/callbacks.h"
#include "libssh/session.h"
#include "libssh/misc.h"

#define is_callback_valid(session, cb) \
    (cb->size <= 0 || cb->size > 1024 * sizeof(void *))

/* LEGACY */
static void ssh_legacy_log_callback(int priority,
                                    const char *function,
                                    const char *buffer,
                                    void *userdata)
{
    ssh_session session = (ssh_session)userdata;
    ssh_log_callback log_fn = session->common.callbacks->log_function;
    void *log_data = session->common.callbacks->userdata;

    (void)function; /* unused */

    log_fn(session, priority, buffer, log_data);
}

void
_ssh_remove_legacy_log_cb(void)
{
    if (ssh_get_log_callback() == ssh_legacy_log_callback) {
        _ssh_reset_log_cb();
        ssh_set_log_userdata(NULL);
    }
}

int ssh_set_callbacks(ssh_session session, ssh_callbacks cb) {
  if (session == NULL || cb == NULL) {
    return SSH_ERROR;
  }

  if (is_callback_valid(session, cb)) {
      ssh_set_error(session,
                    SSH_FATAL,
                    "Invalid callback passed in (badly initialized)");
      return SSH_ERROR;
  };
  session->common.callbacks = cb;

  /* LEGACY */
  if (ssh_get_log_callback() == NULL && cb->log_function) {
      ssh_set_log_callback(ssh_legacy_log_callback);
      ssh_set_log_userdata(session);
  }

  return 0;
}

static int ssh_add_set_channel_callbacks(ssh_channel channel,
                                         ssh_channel_callbacks cb,
                                         int prepend)
{
    ssh_session session = NULL;
    int rc;

    if (channel == NULL || cb == NULL) {
      return SSH_ERROR;
    }
    session = channel->session;

    if (is_callback_valid(session, cb)) {
        ssh_set_error(session,
                      SSH_FATAL,
                      "Invalid callback passed in (badly initialized)");
        return SSH_ERROR;
    };
    if (channel->callbacks == NULL) {
        channel->callbacks = ssh_list_new();
        if (channel->callbacks == NULL){
            ssh_set_error_oom(session);
            return SSH_ERROR;
        }
    }
    if (prepend) {
        rc = ssh_list_prepend(channel->callbacks, cb);
    } else {
        rc = ssh_list_append(channel->callbacks, cb);
    }

    return rc;
}

int ssh_set_channel_callbacks(ssh_channel channel, ssh_channel_callbacks cb)
{
    return ssh_add_set_channel_callbacks(channel, cb, 1);
}

int ssh_add_channel_callbacks(ssh_channel channel, ssh_channel_callbacks cb)
{
    return ssh_add_set_channel_callbacks(channel, cb, 0);
}

int ssh_remove_channel_callbacks(ssh_channel channel, ssh_channel_callbacks cb)
{
    struct ssh_iterator *it;

    if (channel == NULL || channel->callbacks == NULL){
        return SSH_ERROR;
    }

    it = ssh_list_find(channel->callbacks, cb);
    if (it == NULL){
        return SSH_ERROR;
    }

    ssh_list_remove(channel->callbacks, it);

    return SSH_OK;
}


int ssh_set_server_callbacks(ssh_session session, ssh_server_callbacks cb){
	if (session == NULL || cb == NULL) {
		return SSH_ERROR;
	}

    if (is_callback_valid(session, cb)) {
        ssh_set_error(session,
                      SSH_FATAL,
                      "Invalid callback passed in (badly initialized)");
        return SSH_ERROR;
    };
	session->server_callbacks = cb;

	return 0;
}