1 /* When dealing with SLIP (to a pty, or ipif) we have separate rx, tx
2 and client buffers. When receiving we may read() any amount, not
3 just whole packets. When transmitting we need to bytestuff anyway,
4 and may be part-way through receiving. */
18 #define SLIP_ESCEND 220
19 #define SLIP_ESCESC 221
23 struct buffer_if
*buff
; /* We unstuff received packets into here
24 and send them to the netlink code. */
26 netlink_deliver_fn
*netlink_to_tunnel
;
27 uint32_t local_address
;
30 /* Generic SLIP mangling code */
32 static void slip_stuff(struct slip
*st
, struct buffer_if
*buf
, int fd
)
34 uint8_t txbuf
[DEFAULT_BUFSIZE
];
40 /* XXX crunchy bytestuff code */
42 for (i
=buf
->start
; i
<(buf
->start
+buf
->size
); i
++) {
46 txbuf
[j
++]=SLIP_ESCEND
;
50 txbuf
[j
++]=SLIP_ESCESC
;
56 if ((j
+2)>DEFAULT_BUFSIZE
) {
57 if (write(fd
,txbuf
,j
)<0) {
58 fatal_perror("slip_stuff: write()");
64 if (write(fd
,txbuf
,j
)<0) {
65 fatal_perror("slip_stuff: write()");
70 static void slip_unstuff(struct slip
*st
, uint8_t *buf
, uint32_t l
)
74 /* XXX really crude unstuff code */
75 /* XXX check for buffer overflow */
76 BUF_ASSERT_USED(st
->buff
);
78 if (st
->pending_esc
) {
79 st
->pending_esc
=False
;
82 *(uint8_t *)buf_append(st
->buff
,1)=SLIP_END
;
85 *(uint8_t *)buf_append(st
->buff
,1)=SLIP_ESC
;
88 fatal("userv_afterpoll: bad SLIP escape character\n");
93 if (st
->buff
->size
>0) {
94 st
->netlink_to_tunnel(&st
->nl
,st
->buff
);
95 BUF_ALLOC(st
->buff
,"userv_afterpoll");
97 buffer_init(st
->buff
,st
->nl
.max_start_pad
);
100 st
->pending_esc
=True
;
103 *(uint8_t *)buf_append(st
->buff
,1)=buf
[i
];
110 static void slip_init(struct slip
*st
, struct cloc loc
, dict_t
*dict
,
111 string_t name
, netlink_deliver_fn
*to_host
)
113 st
->netlink_to_tunnel
=
114 netlink_init(&st
->nl
,st
,loc
,dict
,
115 "netlink-userv-ipif",NULL
,to_host
);
116 st
->buff
=find_cl_if(dict
,"buffer",CL_BUFFER
,True
,"name",loc
);
117 st
->local_address
=string_item_to_ipaddr(
118 dict_find_item(dict
,"local-address", True
, name
, loc
),"netlink");
119 BUF_ALLOC(st
->buff
,"slip_init");
120 st
->pending_esc
=False
;
123 /* Connection to the kernel through userv-ipif */
127 int txfd
; /* We transmit to userv */
128 int rxfd
; /* We receive from userv */
130 string_t service_user
;
131 string_t service_name
;
133 bool_t expecting_userv_exit
;
136 static int userv_beforepoll(void *sst
, struct pollfd
*fds
, int *nfds_io
,
137 int *timeout_io
, const struct timeval
*tv_now
,
140 struct userv
*st
=sst
;
145 fds
[0].events
=POLLERR
; /* Might want to pick up POLLOUT sometime */
147 fds
[1].events
=POLLIN
|POLLERR
|POLLHUP
;
154 static void userv_afterpoll(void *sst
, struct pollfd
*fds
, int nfds
,
155 const struct timeval
*tv_now
, uint64_t *now
)
157 struct userv
*st
=sst
;
158 uint8_t rxbuf
[DEFAULT_BUFSIZE
];
163 if (fds
[1].revents
&POLLERR
) {
164 Message(M_ERR
,"%s: userv_afterpoll: POLLERR!\n",st
->slip
.nl
.name
);
166 if (fds
[1].revents
&POLLIN
) {
167 l
=read(st
->rxfd
,rxbuf
,DEFAULT_BUFSIZE
);
170 fatal_perror("%s: userv_afterpoll: read(rxfd)",
173 fatal("%s: userv_afterpoll: read(rxfd)=0; userv gone away?\n",
175 } else slip_unstuff(&st
->slip
,rxbuf
,l
);
179 /* Send buf to the kernel. Free buf before returning. */
180 static void userv_deliver_to_kernel(void *sst
, struct buffer_if
*buf
)
182 struct userv
*st
=sst
;
184 slip_stuff(&st
->slip
,buf
,st
->txfd
);
187 static void userv_userv_callback(void *sst
, pid_t pid
, int status
)
189 struct userv
*st
=sst
;
192 Message(M_WARNING
,"userv_callback called unexpectedly with pid %d "
193 "(expected %d)\n",pid
,st
->pid
);
196 if (!st
->expecting_userv_exit
) {
197 if (WIFEXITED(status
)) {
198 fatal("%s: userv exited unexpectedly with status %d\n",
199 st
->slip
.nl
.name
,WEXITSTATUS(status
));
200 } else if (WIFSIGNALED(status
)) {
201 fatal("%s: userv exited unexpectedly: uncaught signal %d\n",
202 st
->slip
.nl
.name
,WTERMSIG(status
));
204 fatal("%s: userv stopped unexpectedly\n");
207 Message(M_WARNING
,"%s: userv subprocess died with status %d\n",
208 st
->slip
.nl
.name
,WEXITSTATUS(status
));
212 struct userv_entry_rec
{
217 /* XXX perhaps we should collect and log stderr? */
220 static void userv_entry(void *sst
)
222 struct userv_entry_rec
*st
=sst
;
227 /* XXX close all other fds */
229 execvp(st
->path
,st
->argv
);
230 perror("userv-entry: execvp()");
234 static void userv_invoke_userv(struct userv
*st
)
236 struct userv_entry_rec
*er
;
242 struct netlink_route
*r
;
243 struct ipset
*isnets
;
244 struct subnet_list
*snets
;
249 fatal("userv_invoke_userv: already running\n");
252 /* This is where we actually invoke userv - all the networks we'll
253 be using should already have been registered. */
255 addrs
=safe_malloc(512,"userv_invoke_userv:addrs");
256 snprintf(addrs
,512,"%s,%s,%d,slip",
257 ipaddr_to_string(st
->slip
.local_address
),
258 ipaddr_to_string(st
->slip
.nl
.secnet_address
),st
->slip
.nl
.mtu
);
260 r
=st
->slip
.nl
.routes
;
262 for (i
=0; i
<st
->slip
.nl
.n_routes
; i
++) {
264 struct ipset
*sn
,*nis
;
266 sn
=ipset_from_subnet(r
[i
].net
);
267 nis
=ipset_union(isnets
,sn
);
273 snets
=ipset_to_subnet_list(isnets
);
275 nets
=safe_malloc(20*snets
->entries
,"userv_invoke_userv:nets");
277 for (i
=0; i
<snets
->entries
; i
++) {
278 s
=subnet_to_string(snets
->list
[i
]);
283 nets
[strlen(nets
)-1]=0;
284 subnet_list_free(snets
);
286 Message(M_INFO
,"%s: about to invoke: %s %s %s %s %s\n",st
->slip
.nl
.name
,
287 st
->userv_path
,st
->service_user
,st
->service_name
,addrs
,nets
);
289 st
->slip
.pending_esc
=False
;
292 if (pipe(c_stdin
)!=0) {
293 fatal_perror("userv_invoke_userv: pipe(c_stdin)");
295 if (pipe(c_stdout
)!=0) {
296 fatal_perror("userv_invoke_userv: pipe(c_stdout)");
299 st
->rxfd
=c_stdout
[0];
301 er
=safe_malloc(sizeof(*r
),"userv_invoke_userv: er");
305 /* The arguments are:
309 local-addr,secnet-addr,mtu,protocol
311 er
->argv
=safe_malloc(sizeof(*er
->argv
)*6,"userv_invoke_userv:argv");
312 er
->argv
[0]=st
->userv_path
;
313 er
->argv
[1]=st
->service_user
;
314 er
->argv
[2]=st
->service_name
;
318 er
->path
=st
->userv_path
;
320 st
->pid
=makesubproc(userv_entry
, userv_userv_callback
,
321 er
, st
, st
->slip
.nl
.name
);
328 Message(M_INFO
,"%s: userv-ipif pid is %d\n",st
->slip
.nl
.name
,st
->pid
);
329 /* Read a single character from the pipe to confirm userv-ipif is
330 running. If we get a SIGCHLD at this point then we'll get EINTR. */
331 if (read(st
->rxfd
,&confirm
,1)!=1) {
333 Message(M_WARNING
,"%s: read of confirmation byte was "
334 "interrupted\n",st
->slip
.nl
.name
);
336 fatal_perror("%s: read() of confirmation byte",st
->slip
.nl
.name
);
339 if (confirm
!=SLIP_END
) {
340 fatal("%s: bad confirmation byte %d from userv-ipif\n",
341 st
->slip
.nl
.name
,confirm
);
344 /* Mark rxfd non-blocking */
345 if (fcntl(st
->rxfd
, F_SETFL
, fcntl(st
->rxfd
, F_GETFL
)|O_NONBLOCK
)==-1) {
346 fatal_perror("%s: fcntl(O_NONBLOCK)",st
->slip
.nl
.name
);
350 static void userv_kill_userv(struct userv
*st
)
353 kill(-st
->pid
,SIGTERM
);
354 st
->expecting_userv_exit
=True
;
358 static void userv_phase_hook(void *sst
, uint32_t newphase
)
360 struct userv
*st
=sst
;
361 /* We must wait until signal processing has started before forking
363 if (newphase
==PHASE_RUN
) {
364 userv_invoke_userv(st
);
365 /* Register for poll() */
366 register_for_poll(st
, userv_beforepoll
, userv_afterpoll
, 2,
369 if (newphase
==PHASE_SHUTDOWN
) {
370 userv_kill_userv(st
);
374 static list_t
*userv_apply(closure_t
*self
, struct cloc loc
, dict_t
*context
,
381 st
=safe_malloc(sizeof(*st
),"userv_apply");
383 /* First parameter must be a dict */
384 item
=list_elem(args
,0);
385 if (!item
|| item
->type
!=t_dict
)
386 cfgfatal(loc
,"userv-ipif","parameter must be a dictionary\n");
388 dict
=item
->data
.dict
;
390 slip_init(&st
->slip
,loc
,dict
,"netlink-userv-ipif",
391 userv_deliver_to_kernel
);
393 st
->userv_path
=dict_read_string(dict
,"userv-path",False
,"userv-netlink",
395 st
->service_user
=dict_read_string(dict
,"service-user",False
,
396 "userv-netlink",loc
);
397 st
->service_name
=dict_read_string(dict
,"service-name",False
,
398 "userv-netlink",loc
);
399 if (!st
->userv_path
) st
->userv_path
="userv";
400 if (!st
->service_user
) st
->service_user
="root";
401 if (!st
->service_name
) st
->service_name
="ipif";
402 st
->rxfd
=-1; st
->txfd
=-1;
404 st
->expecting_userv_exit
=False
;
405 add_hook(PHASE_RUN
,userv_phase_hook
,st
);
406 add_hook(PHASE_SHUTDOWN
,userv_phase_hook
,st
);
408 return new_closure(&st
->slip
.nl
.cl
);
411 init_module slip_module
;
412 void slip_module(dict_t
*dict
)
414 add_closure(dict
,"userv-ipif",userv_apply
);
417 add_closure(dict
,"pty-slip",ptyslip_apply
);
418 add_closure(dict
,"slipd",slipd_apply
);