[secnet] / slip.c

/* When dealing with SLIP (to a pty, or ipif) we have separate rx, tx
   and client buffers.  When receiving we may read() any amount, not
   just whole packets.  When transmitting we need to bytestuff anyway,
   and may be part-way through receiving. */

#include "secnet.h"
#include "util.h"
#include "netlink.h"
#include "process.h"
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>

#define SLIP_END    192
#define SLIP_ESC    219
#define SLIP_ESCEND 220
#define SLIP_ESCESC 221

struct slip {
    struct netlink nl;
    struct buffer_if *buff; /* We unstuff received packets into here
			       and send them to the netlink code. */
    bool_t pending_esc;
    netlink_deliver_fn *netlink_to_tunnel;
    uint32_t local_address;
};

/* Generic SLIP mangling code */

static void slip_stuff(struct slip *st, struct buffer_if *buf, int fd)
{
    uint8_t txbuf[DEFAULT_BUFSIZE];
    uint8_t *i;
    int32_t j=0;

    BUF_ASSERT_USED(buf);

    /* There's probably a much more efficient way of implementing this */
    txbuf[j++]=SLIP_END;
    for (i=buf->start; i<(buf->start+buf->size); i++) {
	switch (*i) {
	case SLIP_END:
	    txbuf[j++]=SLIP_ESC;
	    txbuf[j++]=SLIP_ESCEND;
	    break;
	case SLIP_ESC:
	    txbuf[j++]=SLIP_ESC;
	    txbuf[j++]=SLIP_ESCESC;
	    break;
	default:
	    txbuf[j++]=*i;
	    break;
	}
	if ((j+2)>DEFAULT_BUFSIZE) {
	    if (write(fd,txbuf,j)<0) {
		fatal_perror("slip_stuff: write()");
	    }
	    j=0;
	}
    }
    txbuf[j++]=SLIP_END;
    if (write(fd,txbuf,j)<0) {
	fatal_perror("slip_stuff: write()");
    }
    BUF_FREE(buf);
}

static void slip_unstuff(struct slip *st, uint8_t *buf, uint32_t l)
{
    uint32_t i;

    BUF_ASSERT_USED(st->buff);
    for (i=0; i<l; i++) {
	if (st->pending_esc) {
	    st->pending_esc=False;
	    switch(buf[i]) {
	    case SLIP_ESCEND:
		*(uint8_t *)buf_append(st->buff,1)=SLIP_END;
		break;
	    case SLIP_ESCESC:
		*(uint8_t *)buf_append(st->buff,1)=SLIP_ESC;
		break;
	    default:
		fatal("userv_afterpoll: bad SLIP escape character");
	    }
	} else {
	    switch (buf[i]) {
	    case SLIP_END:
		if (st->buff->size>0) {
		    st->netlink_to_tunnel(&st->nl,st->buff);
		    BUF_ALLOC(st->buff,"userv_afterpoll");
		}
		buffer_init(st->buff,st->nl.max_start_pad);
		break;
	    case SLIP_ESC:
		st->pending_esc=True;
		break;
	    default:
		*(uint8_t *)buf_append(st->buff,1)=buf[i];
		break;
	    }
	}
    }
}

static void slip_init(struct slip *st, struct cloc loc, dict_t *dict,
		      cstring_t name, netlink_deliver_fn *to_host)
{
    st->netlink_to_tunnel=
	netlink_init(&st->nl,st,loc,dict,
		     "netlink-userv-ipif",NULL,to_host);
    st->buff=find_cl_if(dict,"buffer",CL_BUFFER,True,"name",loc);
    st->local_address=string_item_to_ipaddr(
	dict_find_item(dict,"local-address", True, name, loc),"netlink");
    BUF_ALLOC(st->buff,"slip_init");
    st->pending_esc=False;
}

/* Connection to the kernel through userv-ipif */

struct userv {
    struct slip slip;
    int txfd; /* We transmit to userv */
    int rxfd; /* We receive from userv */
    cstring_t userv_path;
    cstring_t service_user;
    cstring_t service_name;
    pid_t pid;
    bool_t expecting_userv_exit;
};

static int userv_beforepoll(void *sst, struct pollfd *fds, int *nfds_io,
			    int *timeout_io)
{
    struct userv *st=sst;

    if (st->rxfd!=-1) {
	*nfds_io=2;
	fds[0].fd=st->txfd;
	fds[0].events=0; /* Might want to pick up POLLOUT sometime */
	fds[1].fd=st->rxfd;
	fds[1].events=POLLIN;
    } else {
	*nfds_io=0;
    }
    return 0;
}

static void userv_afterpoll(void *sst, struct pollfd *fds, int nfds)
{
    struct userv *st=sst;
    uint8_t rxbuf[DEFAULT_BUFSIZE];
    int l;

    if (nfds==0) return;

    if (fds[1].revents&POLLERR) {
	Message(M_ERR,"%s: userv_afterpoll: POLLERR!\n",st->slip.nl.name);
    }
    if (fds[1].revents&POLLIN) {
	l=read(st->rxfd,rxbuf,DEFAULT_BUFSIZE);
	if (l<0) {
	    if (errno!=EINTR)
		fatal_perror("%s: userv_afterpoll: read(rxfd)",
			     st->slip.nl.name);
	} else if (l==0) {
	    fatal("%s: userv_afterpoll: read(rxfd)=0; userv gone away?",
		  st->slip.nl.name);
	} else slip_unstuff(&st->slip,rxbuf,l);
    }
}

/* Send buf to the kernel. Free buf before returning. */
static void userv_deliver_to_kernel(void *sst, struct buffer_if *buf)
{
    struct userv *st=sst;

    slip_stuff(&st->slip,buf,st->txfd);
}

static void userv_userv_callback(void *sst, pid_t pid, int status)
{
    struct userv *st=sst;

    if (pid!=st->pid) {
	Message(M_WARNING,"userv_callback called unexpectedly with pid %d "
		"(expected %d)\n",pid,st->pid);
	return;
    }
    if (!st->expecting_userv_exit) {
	if (WIFEXITED(status)) {
	    fatal("%s: userv exited unexpectedly with status %d",
		  st->slip.nl.name,WEXITSTATUS(status));
	} else if (WIFSIGNALED(status)) {
	    fatal("%s: userv exited unexpectedly: uncaught signal %d",
		  st->slip.nl.name,WTERMSIG(status));
	} else {
	    fatal("%s: userv stopped unexpectedly");
	}
    }
    Message(M_WARNING,"%s: userv subprocess died with status %d\n",
	    st->slip.nl.name,WEXITSTATUS(status));
    st->pid=0;
}

struct userv_entry_rec {
    cstring_t path;
    const char **argv;
    int in;
    int out;
    /* XXX perhaps we should collect and log stderr? */
};

static void userv_entry(void *sst)
{
    struct userv_entry_rec *st=sst;

    dup2(st->in,0);
    dup2(st->out,1);

    /* XXX close all other fds */
    setsid();
    /* XXX We really should strdup() all of argv[] but because we'll just
       exit anyway if execvp() fails it doesn't seem worth bothering. */
    execvp(st->path,(char *const*)st->argv);
    perror("userv-entry: execvp()");
    exit(1);
}

static void userv_invoke_userv(struct userv *st)
{
    struct userv_entry_rec *er;
    int c_stdin[2];
    int c_stdout[2];
    string_t addrs;
    string_t nets;
    string_t s;
    struct netlink_client *r;
    struct ipset *allnets;
    struct subnet_list *snets;
    int i, nread;
    uint8_t confirm;

    if (st->pid) {
	fatal("userv_invoke_userv: already running");
    }

    /* This is where we actually invoke userv - all the networks we'll
       be using should already have been registered. */

    addrs=safe_malloc(512,"userv_invoke_userv:addrs");
    snprintf(addrs,512,"%s,%s,%d,slip",
	     ipaddr_to_string(st->slip.local_address),
	     ipaddr_to_string(st->slip.nl.secnet_address),st->slip.nl.mtu);

    allnets=ipset_new();
    for (r=st->slip.nl.clients; r; r=r->next) {
	if (r->link_quality > LINK_QUALITY_UNUSED) {
	    struct ipset *nan;
	    r->kup=True;
	    nan=ipset_union(allnets,r->networks);
	    ipset_free(allnets);
	    allnets=nan;
	}
    }
    snets=ipset_to_subnet_list(allnets);
    ipset_free(allnets);
    nets=safe_malloc(20*snets->entries,"userv_invoke_userv:nets");
    *nets=0;
    for (i=0; i<snets->entries; i++) {
	s=subnet_to_string(snets->list[i]);
	strcat(nets,s);
	strcat(nets,",");
	free(s);
    }
    nets[strlen(nets)-1]=0;
    subnet_list_free(snets);

    Message(M_INFO,"%s: about to invoke: %s %s %s %s %s\n",st->slip.nl.name,
	    st->userv_path,st->service_user,st->service_name,addrs,nets);

    st->slip.pending_esc=False;

    /* Invoke userv */
    if (pipe(c_stdin)!=0) {
	fatal_perror("userv_invoke_userv: pipe(c_stdin)");
    }
    if (pipe(c_stdout)!=0) {
	fatal_perror("userv_invoke_userv: pipe(c_stdout)");
    }
    st->txfd=c_stdin[1];
    st->rxfd=c_stdout[0];

    er=safe_malloc(sizeof(*r),"userv_invoke_userv: er");

    er->in=c_stdin[0];
    er->out=c_stdout[1];
    /* The arguments are:
       userv
       service-user
       service-name
       local-addr,secnet-addr,mtu,protocol
       route1,route2,... */
    er->argv=safe_malloc(sizeof(*er->argv)*6,"userv_invoke_userv:argv");
    er->argv[0]=st->userv_path;
    er->argv[1]=st->service_user;
    er->argv[2]=st->service_name;
    er->argv[3]=addrs;
    er->argv[4]=nets;
    er->argv[5]=NULL;
    er->path=st->userv_path;

    st->pid=makesubproc(userv_entry, userv_userv_callback,
			er, st, st->slip.nl.name);
    close(er->in);
    close(er->out);
    free(er->argv);
    free(er);
    free(addrs);
    free(nets);
    Message(M_INFO,"%s: userv-ipif pid is %d\n",st->slip.nl.name,st->pid);
    /* Read a single character from the pipe to confirm userv-ipif is
       running. If we get a SIGCHLD at this point then we'll get EINTR. */
    if ((nread=read(st->rxfd,&confirm,1))!=1) {
	if (errno==EINTR) {
	    Message(M_WARNING,"%s: read of confirmation byte was "
		    "interrupted\n",st->slip.nl.name);
	} else {
	    if (nread<0) {
		fatal_perror("%s: error reading confirmation byte",
			     st->slip.nl.name);
	    } else {
		fatal("%s: unexpected EOF instead of confirmation byte"
		      " - userv ipif failed?", st->slip.nl.name);
	    }
	}
    } else {
	if (confirm!=SLIP_END) {
	    fatal("%s: bad confirmation byte %d from userv-ipif",
		  st->slip.nl.name,confirm);
	}
    }
}

static void userv_kill_userv(struct userv *st)
{
    if (st->pid) {
	kill(-st->pid,SIGTERM);
	st->expecting_userv_exit=True;
    }
}

static void userv_phase_hook(void *sst, uint32_t newphase)
{
    struct userv *st=sst;
    /* We must wait until signal processing has started before forking
       userv */
    if (newphase==PHASE_RUN) {
	userv_invoke_userv(st);
	/* Register for poll() */
	register_for_poll(st, userv_beforepoll, userv_afterpoll, 2,
			  st->slip.nl.name);
    }
    if (newphase==PHASE_SHUTDOWN) {
	userv_kill_userv(st);
    }
}

static list_t *userv_apply(closure_t *self, struct cloc loc, dict_t *context,
			   list_t *args)
{
    struct userv *st;
    item_t *item;
    dict_t *dict;

    st=safe_malloc(sizeof(*st),"userv_apply");

    /* First parameter must be a dict */
    item=list_elem(args,0);
    if (!item || item->type!=t_dict)
	cfgfatal(loc,"userv-ipif","parameter must be a dictionary\n");
    
    dict=item->data.dict;

    slip_init(&st->slip,loc,dict,"netlink-userv-ipif",
	      userv_deliver_to_kernel);

    st->userv_path=dict_read_string(dict,"userv-path",False,"userv-netlink",
				    loc);
    st->service_user=dict_read_string(dict,"service-user",False,
				      "userv-netlink",loc);
    st->service_name=dict_read_string(dict,"service-name",False,
				      "userv-netlink",loc);
    if (!st->userv_path) st->userv_path="userv";
    if (!st->service_user) st->service_user="root";
    if (!st->service_name) st->service_name="ipif";
    st->rxfd=-1; st->txfd=-1;
    st->pid=0;
    st->expecting_userv_exit=False;
    add_hook(PHASE_RUN,userv_phase_hook,st);
    add_hook(PHASE_SHUTDOWN,userv_phase_hook,st);

    return new_closure(&st->slip.nl.cl);
}

void slip_module(dict_t *dict)
{
    add_closure(dict,"userv-ipif",userv_apply);
}
Commit	Line	Data
9d3a4132 SE	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. */
	5
	6	#include "secnet.h"
	7	#include "util.h"
	8	#include "netlink.h"
042a8da9	9	#include "process.h"
9d3a4132 SE	10	#include <stdio.h>
	11	#include <string.h>
	12	#include <unistd.h>
042a8da9 SE	13	#include <errno.h>
042a8da9 SE	14	#include <fcntl.h>
9d3a4132 SE	15
	16	#define SLIP_END 192
	17	#define SLIP_ESC 219
	18	#define SLIP_ESCEND 220
	19	#define SLIP_ESCESC 221
	20
042a8da9 SE	21	struct slip {
	22	struct netlink nl;
	23	struct buffer_if buff; / We unstuff received packets into here
	24	and send them to the netlink code. */
	25	bool_t pending_esc;
	26	netlink_deliver_fn *netlink_to_tunnel;
	27	uint32_t local_address;
	28	};
	29
	30	/* Generic SLIP mangling code */
	31
	32	static void slip_stuff(struct slip st, struct buffer_if buf, int fd)
	33	{
	34	uint8_t txbuf[DEFAULT_BUFSIZE];
	35	uint8_t *i;
1caa23ff	36	int32_t j=0;
042a8da9 SE	37
	38	BUF_ASSERT_USED(buf);
	39
d3fe100d	40	/* There's probably a much more efficient way of implementing this */
042a8da9 SE	41	txbuf[j++]=SLIP_END;
	42	for (i=buf->start; i<(buf->start+buf->size); i++) {
	43	switch (*i) {
	44	case SLIP_END:
	45	txbuf[j++]=SLIP_ESC;
	46	txbuf[j++]=SLIP_ESCEND;
	47	break;
	48	case SLIP_ESC:
	49	txbuf[j++]=SLIP_ESC;
	50	txbuf[j++]=SLIP_ESCESC;
	51	break;
	52	default:
	53	txbuf[j++]=*i;
	54	break;
	55	}
	56	if ((j+2)>DEFAULT_BUFSIZE) {
	57	if (write(fd,txbuf,j)<0) {
	58	fatal_perror("slip_stuff: write()");
	59	}
	60	j=0;
	61	}
	62	}
	63	txbuf[j++]=SLIP_END;
	64	if (write(fd,txbuf,j)<0) {
	65	fatal_perror("slip_stuff: write()");
	66	}
	67	BUF_FREE(buf);
	68	}
	69
	70	static void slip_unstuff(struct slip st, uint8_t buf, uint32_t l)
	71	{
	72	uint32_t i;
	73
042a8da9 SE	74	BUF_ASSERT_USED(st->buff);
	75	for (i=0; i<l; i++) {
	76	if (st->pending_esc) {
	77	st->pending_esc=False;
	78	switch(buf[i]) {
	79	case SLIP_ESCEND:
	80	(uint8_t )buf_append(st->buff,1)=SLIP_END;
	81	break;
	82	case SLIP_ESCESC:
	83	(uint8_t )buf_append(st->buff,1)=SLIP_ESC;
	84	break;
	85	default:
4f5e39ec	86	fatal("userv_afterpoll: bad SLIP escape character");
042a8da9 SE	87	}
	88	} else {
	89	switch (buf[i]) {
	90	case SLIP_END:
	91	if (st->buff->size>0) {
469fd1d9	92	st->netlink_to_tunnel(&st->nl,st->buff);
042a8da9 SE	93	BUF_ALLOC(st->buff,"userv_afterpoll");
	94	}
	95	buffer_init(st->buff,st->nl.max_start_pad);
	96	break;
	97	case SLIP_ESC:
	98	st->pending_esc=True;
	99	break;
	100	default:
	101	(uint8_t )buf_append(st->buff,1)=buf[i];
	102	break;
	103	}
	104	}
	105	}
	106	}
	107
	108	static void slip_init(struct slip st, struct cloc loc, dict_t dict,
fe5e9cc4	109	cstring_t name, netlink_deliver_fn *to_host)
042a8da9 SE	110	{
	111	st->netlink_to_tunnel=
	112	netlink_init(&st->nl,st,loc,dict,
	113	"netlink-userv-ipif",NULL,to_host);
	114	st->buff=find_cl_if(dict,"buffer",CL_BUFFER,True,"name",loc);
794f2398	115	st->local_address=string_item_to_ipaddr(
042a8da9 SE	116	dict_find_item(dict,"local-address", True, name, loc),"netlink");
	117	BUF_ALLOC(st->buff,"slip_init");
	118	st->pending_esc=False;
	119	}
	120
9d3a4132 SE	121	/* Connection to the kernel through userv-ipif */
	122
	123	struct userv {
042a8da9	124	struct slip slip;
9d3a4132 SE	125	int txfd; /* We transmit to userv */
9d3a4132 SE	126	int rxfd; /* We receive from userv */
fe5e9cc4 SE	127	cstring_t userv_path;
	128	cstring_t service_user;
	129	cstring_t service_name;
042a8da9 SE	130	pid_t pid;
042a8da9 SE	131	bool_t expecting_userv_exit;
9d3a4132 SE	132	};
	133
	134	static int userv_beforepoll(void sst, struct pollfd fds, int *nfds_io,
90a39563	135	int *timeout_io)
9d3a4132 SE	136	{
9d3a4132 SE	137	struct userv *st=sst;
042a8da9 SE	138
	139	if (st->rxfd!=-1) {
	140	*nfds_io=2;
	141	fds[0].fd=st->txfd;
fe5e9cc4	142	fds[0].events=0; /* Might want to pick up POLLOUT sometime */
042a8da9	143	fds[1].fd=st->rxfd;
fe5e9cc4	144	fds[1].events=POLLIN;
042a8da9 SE	145	} else {
	146	*nfds_io=0;
	147	}
9d3a4132 SE	148	return 0;
	149	}
	150
90a39563	151	static void userv_afterpoll(void sst, struct pollfd fds, int nfds)
9d3a4132 SE	152	{
	153	struct userv *st=sst;
	154	uint8_t rxbuf[DEFAULT_BUFSIZE];
042a8da9 SE	155	int l;
	156
	157	if (nfds==0) return;
9d3a4132 SE	158
9d3a4132 SE	159	if (fds[1].revents&POLLERR) {
469fd1d9	160	Message(M_ERR,"%s: userv_afterpoll: POLLERR!\n",st->slip.nl.name);
9d3a4132 SE	161	}
	162	if (fds[1].revents&POLLIN) {
	163	l=read(st->rxfd,rxbuf,DEFAULT_BUFSIZE);
	164	if (l<0) {
042a8da9 SE	165	if (errno!=EINTR)
	166	fatal_perror("%s: userv_afterpoll: read(rxfd)",
	167	st->slip.nl.name);
	168	} else if (l==0) {
4f5e39ec	169	fatal("%s: userv_afterpoll: read(rxfd)=0; userv gone away?",
042a8da9 SE	170	st->slip.nl.name);
042a8da9 SE	171	} else slip_unstuff(&st->slip,rxbuf,l);
9d3a4132 SE	172	}
	173	}
	174
	175	/* Send buf to the kernel. Free buf before returning. */
469fd1d9	176	static void userv_deliver_to_kernel(void sst, struct buffer_if buf)
9d3a4132 SE	177	{
9d3a4132 SE	178	struct userv *st=sst;
9d3a4132	179
042a8da9 SE	180	slip_stuff(&st->slip,buf,st->txfd);
042a8da9 SE	181	}
9d3a4132	182
042a8da9 SE	183	static void userv_userv_callback(void *sst, pid_t pid, int status)
	184	{
	185	struct userv *st=sst;
	186
	187	if (pid!=st->pid) {
	188	Message(M_WARNING,"userv_callback called unexpectedly with pid %d "
	189	"(expected %d)\n",pid,st->pid);
	190	return;
9d3a4132	191	}
042a8da9 SE	192	if (!st->expecting_userv_exit) {
042a8da9 SE	193	if (WIFEXITED(status)) {
4f5e39ec	194	fatal("%s: userv exited unexpectedly with status %d",
042a8da9 SE	195	st->slip.nl.name,WEXITSTATUS(status));
042a8da9 SE	196	} else if (WIFSIGNALED(status)) {
4f5e39ec	197	fatal("%s: userv exited unexpectedly: uncaught signal %d",
042a8da9 SE	198	st->slip.nl.name,WTERMSIG(status));
042a8da9 SE	199	} else {
4f5e39ec	200	fatal("%s: userv stopped unexpectedly");
042a8da9	201	}
9d3a4132	202	}
042a8da9 SE	203	Message(M_WARNING,"%s: userv subprocess died with status %d\n",
	204	st->slip.nl.name,WEXITSTATUS(status));
	205	st->pid=0;
9d3a4132 SE	206	}
9d3a4132 SE	207
042a8da9	208	struct userv_entry_rec {
fe5e9cc4 SE	209	cstring_t path;
fe5e9cc4 SE	210	const char **argv;
469fd1d9 SE	211	int in;
469fd1d9 SE	212	int out;
042a8da9 SE	213	/* XXX perhaps we should collect and log stderr? */
	214	};
	215
	216	static void userv_entry(void *sst)
9d3a4132	217	{
042a8da9 SE	218	struct userv_entry_rec *st=sst;
042a8da9 SE	219
469fd1d9 SE	220	dup2(st->in,0);
469fd1d9 SE	221	dup2(st->out,1);
042a8da9 SE	222
	223	/* XXX close all other fds */
	224	setsid();
fe5e9cc4 SE	225	/* XXX We really should strdup() all of argv[] but because we'll just
	226	exit anyway if execvp() fails it doesn't seem worth bothering. */
	227	execvp(st->path,(char const)st->argv);
042a8da9 SE	228	perror("userv-entry: execvp()");
	229	exit(1);
	230	}
	231
	232	static void userv_invoke_userv(struct userv *st)
	233	{
	234	struct userv_entry_rec *er;
9d3a4132 SE	235	int c_stdin[2];
	236	int c_stdout[2];
	237	string_t addrs;
	238	string_t nets;
	239	string_t s;
d3fe100d SE	240	struct netlink_client *r;
d3fe100d SE	241	struct ipset *allnets;
794f2398	242	struct subnet_list *snets;
4f5e39ec	243	int i, nread;
042a8da9 SE	244	uint8_t confirm;
	245
	246	if (st->pid) {
4f5e39ec	247	fatal("userv_invoke_userv: already running");
042a8da9	248	}
9d3a4132 SE	249
	250	/* This is where we actually invoke userv - all the networks we'll
	251	be using should already have been registered. */
	252
042a8da9 SE	253	addrs=safe_malloc(512,"userv_invoke_userv:addrs");
	254	snprintf(addrs,512,"%s,%s,%d,slip",
	255	ipaddr_to_string(st->slip.local_address),
	256	ipaddr_to_string(st->slip.nl.secnet_address),st->slip.nl.mtu);
9d3a4132	257
d3fe100d SE	258	allnets=ipset_new();
d3fe100d SE	259	for (r=st->slip.nl.clients; r; r=r->next) {
f208b9a9 IJ	260	if (r->link_quality > LINK_QUALITY_UNUSED) {
	261	struct ipset *nan;
	262	r->kup=True;
	263	nan=ipset_union(allnets,r->networks);
	264	ipset_free(allnets);
	265	allnets=nan;
	266	}
9d3a4132	267	}
d3fe100d SE	268	snets=ipset_to_subnet_list(allnets);
d3fe100d SE	269	ipset_free(allnets);
794f2398 SE	270	nets=safe_malloc(20*snets->entries,"userv_invoke_userv:nets");
	271	*nets=0;
	272	for (i=0; i<snets->entries; i++) {
	273	s=subnet_to_string(snets->list[i]);
	274	strcat(nets,s);
	275	strcat(nets,",");
	276	free(s);
	277	}
9d3a4132	278	nets[strlen(nets)-1]=0;
794f2398	279	subnet_list_free(snets);
9d3a4132	280
042a8da9	281	Message(M_INFO,"%s: about to invoke: %s %s %s %s %s\n",st->slip.nl.name,
9d3a4132 SE	282	st->userv_path,st->service_user,st->service_name,addrs,nets);
9d3a4132 SE	283
042a8da9	284	st->slip.pending_esc=False;
9d3a4132 SE	285
	286	/* Invoke userv */
	287	if (pipe(c_stdin)!=0) {
042a8da9	288	fatal_perror("userv_invoke_userv: pipe(c_stdin)");
9d3a4132 SE	289	}
9d3a4132 SE	290	if (pipe(c_stdout)!=0) {
042a8da9	291	fatal_perror("userv_invoke_userv: pipe(c_stdout)");
9d3a4132 SE	292	}
	293	st->txfd=c_stdin[1];
	294	st->rxfd=c_stdout[0];
	295
042a8da9 SE	296	er=safe_malloc(sizeof(*r),"userv_invoke_userv: er");
042a8da9 SE	297
469fd1d9 SE	298	er->in=c_stdin[0];
469fd1d9 SE	299	er->out=c_stdout[1];
042a8da9 SE	300	/* The arguments are:
	301	userv
	302	service-user
	303	service-name
	304	local-addr,secnet-addr,mtu,protocol
	305	route1,route2,... */
	306	er->argv=safe_malloc(sizeof(er->argv)6,"userv_invoke_userv:argv");
	307	er->argv[0]=st->userv_path;
	308	er->argv[1]=st->service_user;
	309	er->argv[2]=st->service_name;
	310	er->argv[3]=addrs;
	311	er->argv[4]=nets;
	312	er->argv[5]=NULL;
	313	er->path=st->userv_path;
	314
	315	st->pid=makesubproc(userv_entry, userv_userv_callback,
	316	er, st, st->slip.nl.name);
469fd1d9 SE	317	close(er->in);
469fd1d9 SE	318	close(er->out);
042a8da9 SE	319	free(er->argv);
	320	free(er);
	321	free(addrs);
	322	free(nets);
	323	Message(M_INFO,"%s: userv-ipif pid is %d\n",st->slip.nl.name,st->pid);
	324	/* Read a single character from the pipe to confirm userv-ipif is
	325	running. If we get a SIGCHLD at this point then we'll get EINTR. */
4f5e39ec	326	if ((nread=read(st->rxfd,&confirm,1))!=1) {
042a8da9 SE	327	if (errno==EINTR) {
	328	Message(M_WARNING,"%s: read of confirmation byte was "
	329	"interrupted\n",st->slip.nl.name);
	330	} else {
4f5e39ec SE	331	if (nread<0) {
	332	fatal_perror("%s: error reading confirmation byte",
	333	st->slip.nl.name);
	334	} else {
	335	fatal("%s: unexpected EOF instead of confirmation byte"
	336	" - userv ipif failed?", st->slip.nl.name);
	337	}
042a8da9 SE	338	}
	339	} else {
	340	if (confirm!=SLIP_END) {
4f5e39ec	341	fatal("%s: bad confirmation byte %d from userv-ipif",
042a8da9 SE	342	st->slip.nl.name,confirm);
042a8da9 SE	343	}
9d3a4132	344	}
042a8da9 SE	345	}
	346
	347	static void userv_kill_userv(struct userv *st)
	348	{
	349	if (st->pid) {
	350	kill(-st->pid,SIGTERM);
	351	st->expecting_userv_exit=True;
	352	}
	353	}
	354
	355	static void userv_phase_hook(void *sst, uint32_t newphase)
	356	{
	357	struct userv *st=sst;
	358	/* We must wait until signal processing has started before forking
	359	userv */
	360	if (newphase==PHASE_RUN) {
	361	userv_invoke_userv(st);
	362	/* Register for poll() */
	363	register_for_poll(st, userv_beforepoll, userv_afterpoll, 2,
	364	st->slip.nl.name);
	365	}
	366	if (newphase==PHASE_SHUTDOWN) {
	367	userv_kill_userv(st);
9d3a4132	368	}
9d3a4132 SE	369	}
	370
	371	static list_t userv_apply(closure_t self, struct cloc loc, dict_t *context,
	372	list_t *args)
	373	{
	374	struct userv *st;
	375	item_t *item;
	376	dict_t *dict;
	377
	378	st=safe_malloc(sizeof(*st),"userv_apply");
	379
	380	/* First parameter must be a dict */
	381	item=list_elem(args,0);
	382	if (!item \|\| item->type!=t_dict)
	383	cfgfatal(loc,"userv-ipif","parameter must be a dictionary\n");
	384
	385	dict=item->data.dict;
	386
042a8da9 SE	387	slip_init(&st->slip,loc,dict,"netlink-userv-ipif",
042a8da9 SE	388	userv_deliver_to_kernel);
9d3a4132 SE	389
	390	st->userv_path=dict_read_string(dict,"userv-path",False,"userv-netlink",
	391	loc);
	392	st->service_user=dict_read_string(dict,"service-user",False,
	393	"userv-netlink",loc);
	394	st->service_name=dict_read_string(dict,"service-name",False,
	395	"userv-netlink",loc);
	396	if (!st->userv_path) st->userv_path="userv";
	397	if (!st->service_user) st->service_user="root";
	398	if (!st->service_name) st->service_name="ipif";
9d3a4132	399	st->rxfd=-1; st->txfd=-1;
042a8da9 SE	400	st->pid=0;
	401	st->expecting_userv_exit=False;
	402	add_hook(PHASE_RUN,userv_phase_hook,st);
	403	add_hook(PHASE_SHUTDOWN,userv_phase_hook,st);
9d3a4132	404
042a8da9	405	return new_closure(&st->slip.nl.cl);
9d3a4132 SE	406	}
9d3a4132 SE	407
9d3a4132 SE	408	void slip_module(dict_t *dict)
	409	{
	410	add_closure(dict,"userv-ipif",userv_apply);
9d3a4132	411	}