File: br2684ctl.c

package info (click to toggle)
br2684ctl 20040226-1
  • links: PTS
  • area: main
  • in suites: etch, etch-m68k, lenny, sarge
  • size: 60 kB
  • ctags: 18
  • sloc: ansic: 210; makefile: 42
file content (281 lines) | stat: -rw-r--r-- 6,765 bytes parent folder | download
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
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <signal.h>
#include <string.h>
#include <syslog.h>
#include <atm.h>
#include <linux/atmdev.h>
#include <linux/atmbr2684.h>

/* Written by Marcell GAL <cell@sch.bme.hu> to make use of the */
/* ioctls defined in the br2684... kernel patch */
/* Compile with cc -o br2684ctl br2684ctl.c -latm */

/*
  Modified feb 2001 by Stephen Aaskov (saa@lasat.com)
  - Added daemonization code
  - Added syslog
  
  TODO: Delete interfaces after exit?
*/


#define LOG_NAME       "br2684ctl"
#define LOG_OPTION     LOG_PERROR|LOG_PID
#define LOG_FACILITY   LOG_LOCAL2


int lastsock, lastitf;


void fatal(const char *str, int i)
{
  syslog (LOG_ERR,"Fatal: %s",str);
  exit(-2);
};


void exitFunc(void)
{
  syslog (LOG_NOTICE,"Daemon terminated\n");
}


void int_signal(int dummy)
{
  syslog (LOG_INFO,"Killed by a signal\n");
  exit(0);
}

int create_pidfile(int num)
{
  FILE *pidfile = NULL;
  char name[32];

  if (num < 0) return -1;

  snprintf(name, 20, "/var/run/nas%d.pid", num);
  pidfile = fopen(name, "w");
  if (pidfile == NULL) return -1;
  fprintf(pidfile, "%d", getpid());
  fclose(pidfile);

  return 0;
}

int create_br(char *nstr)
{
  int num, err;
  
  if(lastsock<0) {
    lastsock = socket(PF_ATMPVC, SOCK_DGRAM, ATM_AAL5);
  }
  if (lastsock<0) {
    syslog(LOG_ERR, "socket creation failed: %s",strerror(errno));
  } else {
    /* create the device with ioctl: */
    num=atoi(nstr);
    if( num>=0 && num<1234567890){
      struct atm_newif_br2684 ni;
      ni.backend_num = ATM_BACKEND_BR2684;
      ni.media = BR2684_MEDIA_ETHERNET;
      ni.mtu = 1500;
      sprintf(ni.ifname, "nas%d", num);
      err=ioctl (lastsock, ATM_NEWBACKENDIF, &ni);
  
      if (err == 0)
	syslog(LOG_NOTICE, "Interface \"%s\" created sucessfully\n",ni.ifname);
      else
	syslog(LOG_INFO, "Interface \"%s\" could not be created, reason: %s\n",
	       ni.ifname,
	       strerror(errno));
      lastitf=num;	/* even if we didn't create, because existed, assign_vcc wil want to know it! */
    } else {
      syslog(LOG_ERR,"err: strange interface number %d", num );
    }
  }
  return 0;
}


int assign_vcc(char *astr, int encap, int bufsize, struct atm_qos qos)
{
    int err;
    struct sockaddr_atmpvc addr;
    int fd;
    struct atm_backend_br2684 be;

    memset(&addr, 0, sizeof(addr));
    err=text2atm(astr,(struct sockaddr *)(&addr), sizeof(addr), T2A_PVC);
    if (err!=0)
      syslog(LOG_ERR,"Could not parse ATM parameters (error=%d)\n",err);
    
#if 0
    addr.sap_family = AF_ATMPVC;
    addr.sap_addr.itf = itf;
    addr.sap_addr.vpi = 0;
    addr.sap_addr.vci = vci;
#endif
    syslog(LOG_NOTICE,"Communicating over ATM %d.%d.%d, encapsulation: %s\n", addr.sap_addr.itf,
	   addr.sap_addr.vpi,
	   addr.sap_addr.vci,
	   encap?"VC mux":"LLC");
    
    if ((fd = socket(PF_ATMPVC, SOCK_DGRAM, ATM_AAL5)) < 0)
      syslog(LOG_ERR,"failed to create socket %d, reason: %s", errno,strerror(errno));
    
    if (qos.aal == 0) {
      qos.aal                     = ATM_AAL5;
      qos.txtp.traffic_class      = ATM_UBR;
      qos.txtp.max_sdu            = 1524;
      qos.txtp.pcr                = ATM_MAX_PCR;
      qos.rxtp = qos.txtp;
    }

    if ( (err=setsockopt(fd,SOL_SOCKET,SO_SNDBUF, &bufsize ,sizeof(bufsize))) )
      syslog(LOG_ERR,"setsockopt SO_SNDBUF: (%d) %s\n",err, strerror(err));
    
    if (setsockopt(fd, SOL_ATM, SO_ATMQOS, &qos, sizeof(qos)) < 0)
      syslog(LOG_ERR,"setsockopt SO_ATMQOS %d", errno);

    err = connect(fd, (struct sockaddr*)&addr, sizeof(struct sockaddr_atmpvc));
    
    if (err < 0)
      fatal("failed to connect on socket", err);
    
    /* attach the vcc to device: */
    
    be.backend_num = ATM_BACKEND_BR2684;
    be.ifspec.method = BR2684_FIND_BYIFNAME;
    sprintf(be.ifspec.spec.ifname, "nas%d", lastitf);
    be.fcs_in = BR2684_FCSIN_NO;
    be.fcs_out = BR2684_FCSOUT_NO;
    be.fcs_auto = 0;
    be.encaps = encap ? BR2684_ENCAPS_VC : BR2684_ENCAPS_LLC;
    be.has_vpiid = 0;
    be.send_padding = 0;
    be.min_size = 0;
    err=ioctl (fd, ATM_SETBACKEND, &be);
    if (err == 0)
      syslog (LOG_INFO,"Interface configured");
    else {
      syslog (LOG_ERR,"Could not configure interface:%s",strerror(errno));
      exit(2);
    }
    return fd ;
}


void usage(char *s)
{
  printf("usage: %s [-b] [[-c number] [-e 0|1] [-s sndbuf] [-q qos] [-a [itf.]vpi.vci]*]*\n", s);
  exit(1);
}



int main (int argc, char **argv)
{
  int c, background=0, encap=0, sndbuf=8192;
  struct atm_qos reqqos;
  int itfnum;
  lastsock=-1;
  lastitf=0;
  
  /* st qos to 0 */
  memset(&reqqos, 0, sizeof(reqqos));

  openlog (LOG_NAME,LOG_OPTION,LOG_FACILITY);
  if (argc>1)
    while ((c = getopt(argc, argv,"q:a:bc:e:s:?h")) !=EOF)
      switch (c) {
      case 'q':
	printf ("optarg : %s",optarg);
	if (text2qos(optarg,&reqqos,0)) fprintf(stderr,"QOS parameter invalid\n"); 
	break;
      case 'a':
	assign_vcc(optarg, encap, sndbuf, reqqos);
	break;
      case 'b':
	background=1;
	break;
      case 'c':
	create_br(optarg);
	itfnum = atoi(optarg);
	break;
      case 'e':
	encap=(atoi(optarg));
	if(encap<0){
	  syslog (LOG_ERR, "invalid encapsulation: %s:\n",optarg);
	  encap=0;
	}
	break;
      case 's':
	sndbuf=(atoi(optarg));
	if(sndbuf<0){
	  syslog(LOG_ERR, "Invalid sndbuf: %s, using size of 8192 instead\n",optarg);
	  sndbuf=8192;
	}
	break;
      case '?':
      case 'h':
      default:
	usage(argv[0]);
      }
  else
    usage(argv[0]);

  if (argc != optind) usage(argv[0]);
  
  if(lastsock>=0) close(lastsock);
  
  if (background) {
    pid_t pid;
    
    pid=fork();
    if (pid < 0) {
      fprintf(stderr,"Error detaching\n");
      exit(2);
    } else if (pid) 
      exit(0); // This is the parent
    
    // Become a process group and session group leader
    if (setsid()<0) {
      fprintf (stderr,"Could not set process group\n");
      exit(2);
    }
    
    // Fork again to let process group leader exit
    pid = fork();
    if (pid < 0) {
      fprintf(stderr,"Error detaching during second fork\n");
      exit(2);
    } else if (pid)
      exit(0); // This is the parent
    
    // Now we're ready for buisness
    chdir("/");            // Don't keep directories in use
    close(0); close(1); close(2);  // Close stdin, -out and -error
    /*
      Note that this implementation does not keep an open 
      stdout/err.
      If we need them they can be opened now
    */
    
  }
  
  create_pidfile(itfnum);
  signal(SIGINT, int_signal);
  signal(SIGTERM, int_signal);

  syslog (LOG_INFO, "RFC 1483/2684 bridge daemon started\n");	
  atexit (exitFunc);
  
  while (1) pause();	/* to keep the sockets... */
  return 0;
}