summaryrefslogtreecommitdiff
path: root/src/ip.cpp
blob: 5de2485bcb69f46ac08ec21b70be2ba3b9020792 (plain)
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
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
/*
    Copyright (c) 2007-2011 iMatix Corporation
    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file

    This file is part of 0MQ.

    0MQ 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 3 of the License, or
    (at your option) any later version.

    0MQ 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 this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include <stdlib.h>
#include <string.h>
#include <stdlib.h>
#include <string>

#include "ip.hpp"
#include "err.hpp"
#include "platform.hpp"
#include "stdint.hpp"

#if defined ZMQ_HAVE_SOLARIS

#include <sys/sockio.h>
#include <net/if.h>
#include <unistd.h>

//  On Solaris platform, network interface name can be queried by ioctl.
static int resolve_nic_name (in_addr* addr_, char const *interface_)
{
    //  Create a socket.
    int fd = socket (AF_INET, SOCK_DGRAM, 0);
    zmq_assert (fd != -1);

    //  Retrieve number of interfaces.
    lifnum ifn;
    ifn.lifn_family = AF_UNSPEC;
    ifn.lifn_flags = 0;
    int rc = ioctl (fd, SIOCGLIFNUM, (char*) &ifn);
    zmq_assert (rc != -1);

    //  Allocate memory to get interface names.
    size_t ifr_size = sizeof (struct lifreq) * ifn.lifn_count;
    char *ifr = (char*) malloc (ifr_size);
    alloc_assert (ifr);
    
    //  Retrieve interface names.
    lifconf ifc;
    ifc.lifc_family = AF_UNSPEC;
    ifc.lifc_flags = 0;
    ifc.lifc_len = ifr_size;
    ifc.lifc_buf = ifr;
    rc = ioctl (fd, SIOCGLIFCONF, (char*) &ifc);
    zmq_assert (rc != -1);

    //  Find the interface with the specified name and AF_INET family.
    bool found = false;
    lifreq *ifrp = ifc.lifc_req;
    for (int n = 0; n < (int) (ifc.lifc_len / sizeof (lifreq));
          n ++, ifrp ++) {
        if (!strcmp (interface_, ifrp->lifr_name)) {
            rc = ioctl (fd, SIOCGLIFADDR, (char*) ifrp);
            zmq_assert (rc != -1);
            if (ifrp->lifr_addr.ss_family == AF_INET) {
                *addr_ = ((sockaddr_in*) &ifrp->lifr_addr)->sin_addr;
                found = true;
                break;
            }
        }
    }

    //  Clean-up.
    free (ifr);
    close (fd);

    if (!found) {
        errno = ENODEV;
        return -1;
    }

    return 0;
}

#elif defined ZMQ_HAVE_AIX || ZMQ_HAVE_HPUX

#include <sys/types.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <net/if.h>

static int resolve_nic_name (in_addr* addr_, char const *interface_)
{
    //  Create a socket.
    int sd = socket (AF_INET, SOCK_DGRAM, 0);
    zmq_assert (sd != -1);

    struct ifreq ifr; 

    //  Copy interface name for ioctl get.
    strncpy (ifr.ifr_name, interface_, sizeof (ifr.ifr_name));

    //  Fetch interface address.
    int rc = ioctl (sd, SIOCGIFADDR, (caddr_t) &ifr, sizeof (struct ifreq));

    //  Clean up.
    close (sd);

    if (rc == -1) {
        errno = ENODEV;
        return -1;
    }

    struct sockaddr *sa = (struct sockaddr *) &ifr.ifr_addr;
    *addr_ = ((sockaddr_in*)sa)->sin_addr;
    return 0;    
}

#elif ((defined ZMQ_HAVE_LINUX || defined ZMQ_HAVE_FREEBSD ||\
    defined ZMQ_HAVE_OSX || defined ZMQ_HAVE_OPENBSD ||\
    defined ZMQ_HAVE_QNXNTO || defined ZMQ_HAVE_NETBSD)\
    && defined ZMQ_HAVE_IFADDRS)

#include <ifaddrs.h>

//  On these platforms, network interface name can be queried
//  using getifaddrs function.
static int resolve_nic_name (in_addr* addr_, char const *interface_)
{
    //  Get the addresses.
    ifaddrs* ifa = NULL;
    int rc = getifaddrs (&ifa);
    zmq_assert (rc == 0);    
    zmq_assert (ifa != NULL);

    //  Find the corresponding network interface.
    bool found = false;
    for (ifaddrs *ifp = ifa; ifp != NULL ;ifp = ifp->ifa_next)
        if (ifp->ifa_addr && ifp->ifa_addr->sa_family == AF_INET 
            && !strcmp (interface_, ifp->ifa_name)) 
        {
            *addr_ = ((sockaddr_in*) ifp->ifa_addr)->sin_addr;
            found = true;
            break;
        }

    //  Clean-up;
    freeifaddrs (ifa);

    if (!found) {
        errno = ENODEV;
        return -1;
    }

    return 0;
}

#else

//  On other platforms we assume there are no sane interface names.
//  This is true especially of Windows.
static int resolve_nic_name (in_addr* addr_, char const *interface_)
{
    errno = ENODEV;
    return -1;
}

#endif

int zmq::resolve_ip_interface (sockaddr_storage* addr_, socklen_t *addr_len_,
    char const *interface_)
{
    //  Find the ':' at end that separates NIC name from service.
    const char *delimiter = strrchr (interface_, ':');
    if (!delimiter) {
        errno = EINVAL;
        return -1;
    }

    //  Separate the name/port.
    std::string iface (interface_, delimiter - interface_);
    std::string service (delimiter + 1);

    //  Initialize the output parameter.
    memset (addr_, 0, sizeof (*addr_));

    //  Initialise IPv4-format family/port.
    sockaddr_in ip4_addr;
    memset (&ip4_addr, 0, sizeof (ip4_addr));
    ip4_addr.sin_family = AF_INET;
    ip4_addr.sin_port = htons ((uint16_t) atoi (service.c_str()));

    //  Initialize temporary output pointers with ip4_addr
    sockaddr *out_addr = (sockaddr *) &ip4_addr;
    socklen_t out_addrlen = (socklen_t) sizeof (ip4_addr);

    //  0 is not a valid port.
    if (!ip4_addr.sin_port) {
        errno = EINVAL;
        return -1;
    }

    //  * resolves to INADDR_ANY.
    if (iface.compare("*") == 0) {
        ip4_addr.sin_addr.s_addr = htonl (INADDR_ANY);
        zmq_assert (out_addrlen <= (socklen_t) sizeof (*addr_));
        memcpy (addr_, out_addr, out_addrlen);
        *addr_len_ = out_addrlen;
        return 0;
    }

    //  Try to resolve the string as a NIC name.
    int rc = resolve_nic_name (&ip4_addr.sin_addr, iface.c_str());
    if (rc != 0 && errno != ENODEV)
        return rc;
    if (rc == 0) {
        zmq_assert (out_addrlen <= (socklen_t) sizeof (*addr_));
        memcpy (addr_, out_addr, out_addrlen);
        *addr_len_ = out_addrlen;
        return 0;
    }

    //  There's no such interface name. Assume literal address.
#if defined ZMQ_HAVE_OPENVMS && defined __ia64
    __addrinfo64 *res = NULL;
    __addrinfo64 req;
#else
    addrinfo *res = NULL;
    addrinfo req;
#endif
    memset (&req, 0, sizeof (req));

    //  We only support IPv4 addresses for now.
    req.ai_family = AF_INET;

    //  Arbitrary, not used in the output, but avoids duplicate results.
    req.ai_socktype = SOCK_STREAM;

    //  Restrict hostname/service to literals to avoid any DNS lookups or
    //  service-name irregularity due to indeterminate socktype.
    req.ai_flags = AI_PASSIVE | AI_NUMERICHOST | AI_NUMERICSERV;

    //  Resolve the literal address. Some of the error info is lost in case
    //  of error, however, there's no way to report EAI errors via errno.
    rc = getaddrinfo (iface.c_str(), service.c_str(), &req, &res);
    if (rc) {
        errno = ENODEV;
        return -1;
    }

    //  Use the first result.
    zmq_assert ((size_t) (res->ai_addrlen) <= sizeof (*addr_));
    memcpy (addr_, res->ai_addr, res->ai_addrlen);
    *addr_len_ = (socklen_t) res->ai_addrlen;

    //  Cleanup getaddrinfo after copying the possibly referenced result.
    if (res)
        freeaddrinfo (res);

    return 0;
}

int zmq::resolve_ip_hostname (sockaddr_storage *addr_, socklen_t *addr_len_,
    const char *hostname_)
{
    //  Find the ':' that separates hostname name from service.
    const char *delimiter = strchr (hostname_, ':');
    if (!delimiter) {
        errno = EINVAL;
        return -1;
    }

    //  Separate the hostname and service.
    std::string hostname (hostname_, delimiter - hostname_);
    std::string service (delimiter + 1);

    //  Set up the query.
    addrinfo req;
    memset (&req, 0, sizeof (req));

    //  We only support IPv4 addresses for now.
    req.ai_family = AF_INET;

    //  Need to choose one to avoid duplicate results from getaddrinfo() - this
    //  doesn't really matter, since it's not included in the addr-output.
    req.ai_socktype = SOCK_STREAM;
    
    //  Avoid named services due to unclear socktype.
    req.ai_flags = AI_NUMERICSERV;

    //  Resolve host name. Some of the error info is lost in case of error,
    //  however, there's no way to report EAI errors via errno.
    addrinfo *res;
    int rc = getaddrinfo (hostname.c_str (), service.c_str (), &req, &res);
    if (rc) {
        errno = EINVAL;
        return -1;
    }

    //  Copy first result to output addr with hostname and service.
    zmq_assert ((size_t) (res->ai_addrlen) <= sizeof (*addr_));
    memcpy (addr_, res->ai_addr, res->ai_addrlen);
    *addr_len_ = (socklen_t) res->ai_addrlen;
 
    freeaddrinfo (res);
    
    return 0;
}

int zmq::resolve_local_path (sockaddr_storage *addr_, socklen_t *addr_len_,
    const char *path_)
{
#if defined ZMQ_HAVE_WINDOWS || defined ZMQ_HAVE_OPENVMS
    errno = EPROTONOSUPPORT;
    return -1;
#else
    sockaddr_un *un = (sockaddr_un*) addr_;
    if (strlen (path_) >= sizeof (un->sun_path))
    {
        errno = ENAMETOOLONG;
        return -1;
    }
    strcpy (un->sun_path, path_);
    un->sun_family = AF_UNIX;
    *addr_len_ = sizeof (sockaddr_un);
    return 0;
#endif
}