1 6e527fbc 2005-02-13 devnull #include "std.h"
  2 6e527fbc 2005-02-13 devnull #include "dat.h"
  3 6e527fbc 2005-02-13 devnull 
  4 6e527fbc 2005-02-13 devnull Conv *conv;
  5 6e527fbc 2005-02-13 devnull 
  6 6e527fbc 2005-02-13 devnull ulong taggen = 1;
  7 6e527fbc 2005-02-13 devnull 
  8 6e527fbc 2005-02-13 devnull Conv*
  9 6e527fbc 2005-02-13 devnull convalloc(char *sysuser)
 10 6e527fbc 2005-02-13 devnull {
 11 6e527fbc 2005-02-13 devnull 	Conv *c;
 12 6e527fbc 2005-02-13 devnull 
 13 6e527fbc 2005-02-13 devnull 	c = mallocz(sizeof(Conv), 1);
 14 6e527fbc 2005-02-13 devnull 	if(c == nil)
 15 6e527fbc 2005-02-13 devnull 		return nil;
 16 6e527fbc 2005-02-13 devnull 	c->ref = 1;
 17 6e527fbc 2005-02-13 devnull 	c->tag = taggen++;
 18 6e527fbc 2005-02-13 devnull 	c->next = conv;
 19 6e527fbc 2005-02-13 devnull 	c->sysuser = estrdup(sysuser);
 20 6e527fbc 2005-02-13 devnull 	c->state = "nascent";
 21 6e527fbc 2005-02-13 devnull 	c->rpcwait = chancreate(sizeof(void*), 0);
 22 6e527fbc 2005-02-13 devnull 	c->keywait = chancreate(sizeof(void*), 0);
 23 6e527fbc 2005-02-13 devnull 	strcpy(c->err, "protocol has not started");
 24 6e527fbc 2005-02-13 devnull 	conv = c;
 25 6e527fbc 2005-02-13 devnull 	convreset(c);
 26 6e527fbc 2005-02-13 devnull 	return c;
 27 6e527fbc 2005-02-13 devnull }
 28 6e527fbc 2005-02-13 devnull 
 29 6e527fbc 2005-02-13 devnull void
 30 6e527fbc 2005-02-13 devnull convreset(Conv *c)
 31 6e527fbc 2005-02-13 devnull {
 32 6e527fbc 2005-02-13 devnull 	if(c->ref != 1){
 33 6e527fbc 2005-02-13 devnull 		c->hangup = 1;
 34 6e527fbc 2005-02-13 devnull 		nbsendp(c->rpcwait, 0);
 35 6e527fbc 2005-02-13 devnull 		while(c->ref > 1)
 36 6e527fbc 2005-02-13 devnull 			yield();
 37 6e527fbc 2005-02-13 devnull 		c->hangup = 0;
 38 6e527fbc 2005-02-13 devnull 	}
 39 6e527fbc 2005-02-13 devnull 	c->state = "nascent";
 40 6e527fbc 2005-02-13 devnull 	c->err[0] = '\0';
 41 6e527fbc 2005-02-13 devnull 	freeattr(c->attr);
 42 6e527fbc 2005-02-13 devnull 	c->attr = nil;
 43 6e527fbc 2005-02-13 devnull 	c->proto = nil;
 44 6e527fbc 2005-02-13 devnull 	c->rpc.op = 0;
 45 6e527fbc 2005-02-13 devnull 	c->active = 0;
 46 6e527fbc 2005-02-13 devnull 	c->done = 0;
 47 6e527fbc 2005-02-13 devnull 	c->hangup = 0;
 48 6e527fbc 2005-02-13 devnull }
 49 6e527fbc 2005-02-13 devnull 
 50 6e527fbc 2005-02-13 devnull void
 51 6e527fbc 2005-02-13 devnull convhangup(Conv *c)
 52 6e527fbc 2005-02-13 devnull {
 53 6e527fbc 2005-02-13 devnull 	c->hangup = 1;
 54 6e527fbc 2005-02-13 devnull 	c->rpc.op = 0;
 55 6e527fbc 2005-02-13 devnull 	(*c->kickreply)(c);
 56 6e527fbc 2005-02-13 devnull 	nbsendp(c->rpcwait, 0);
 57 6e527fbc 2005-02-13 devnull }
 58 6e527fbc 2005-02-13 devnull 
 59 6e527fbc 2005-02-13 devnull void
 60 6e527fbc 2005-02-13 devnull convclose(Conv *c)
 61 6e527fbc 2005-02-13 devnull {
 62 6e527fbc 2005-02-13 devnull 	Conv *p;
 63 6e527fbc 2005-02-13 devnull 
 64 6e527fbc 2005-02-13 devnull 	if(c == nil)
 65 6e527fbc 2005-02-13 devnull 		return;
 66 6e527fbc 2005-02-13 devnull 
 67 6e527fbc 2005-02-13 devnull 	if(--c->ref > 0)
 68 6e527fbc 2005-02-13 devnull 		return;
 69 6e527fbc 2005-02-13 devnull 
 70 6e527fbc 2005-02-13 devnull 	if(c == conv){
 71 6e527fbc 2005-02-13 devnull 		conv = c->next;
 72 6e527fbc 2005-02-13 devnull 		goto free;
 73 6e527fbc 2005-02-13 devnull 	}
 74 6e527fbc 2005-02-13 devnull 	for(p=conv; p && p->next!=c; p=p->next)
 75 6e527fbc 2005-02-13 devnull 		;
 76 6e527fbc 2005-02-13 devnull 	if(p == nil){
 77 6e527fbc 2005-02-13 devnull 		print("cannot find conv in list\n");
 78 6e527fbc 2005-02-13 devnull 		return;
 79 6e527fbc 2005-02-13 devnull 	}
 80 6e527fbc 2005-02-13 devnull 	p->next = c->next;
 81 6e527fbc 2005-02-13 devnull 
 82 6e527fbc 2005-02-13 devnull free:
 83 6e527fbc 2005-02-13 devnull 	c->next = nil;
 84 6e527fbc 2005-02-13 devnull 	free(c);
 85 6e527fbc 2005-02-13 devnull }
 86 6e527fbc 2005-02-13 devnull 
 87 6e527fbc 2005-02-13 devnull static Rpc*
 88 6e527fbc 2005-02-13 devnull convgetrpc(Conv *c, int want)
 89 6e527fbc 2005-02-13 devnull {
 90 6e527fbc 2005-02-13 devnull 	for(;;){
 91 6e527fbc 2005-02-13 devnull 		if(c->hangup){
 92 5f6612ba 2008-05-31 rsc 			flog("convgetrpc: hangup");
 93 6e527fbc 2005-02-13 devnull 			werrstr("hangup");
 94 6e527fbc 2005-02-13 devnull 			return nil;
 95 6e527fbc 2005-02-13 devnull 		}
 96 6e527fbc 2005-02-13 devnull 		if(c->rpc.op == RpcUnknown){
 97 6e527fbc 2005-02-13 devnull 			recvp(c->rpcwait);
 98 6e527fbc 2005-02-13 devnull 			if(c->hangup){
 99 5f6612ba 2008-05-31 rsc 				flog("convgetrpc: hangup");
100 6e527fbc 2005-02-13 devnull 				werrstr("hangup");
101 6e527fbc 2005-02-13 devnull 				return nil;
102 6e527fbc 2005-02-13 devnull 			}
103 6e527fbc 2005-02-13 devnull 			if(c->rpc.op == RpcUnknown)
104 6e527fbc 2005-02-13 devnull 				continue;
105 6e527fbc 2005-02-13 devnull 		}
106 6e527fbc 2005-02-13 devnull 		if(want < 0 || c->rpc.op == want)
107 6e527fbc 2005-02-13 devnull 			return &c->rpc;
108 6e527fbc 2005-02-13 devnull 		rpcrespond(c, "phase in state '%s' want '%s'", c->state, rpcname[want]);
109 6e527fbc 2005-02-13 devnull 	}
110 bcac59d8 2005-08-11 devnull 	/* not reached */
111 6e527fbc 2005-02-13 devnull }
112 6e527fbc 2005-02-13 devnull 
113 6e527fbc 2005-02-13 devnull /* read until the done function tells us that's enough */
114 6e527fbc 2005-02-13 devnull int
115 6e527fbc 2005-02-13 devnull convreadfn(Conv *c, int (*done)(void*, int), char **ps)
116 6e527fbc 2005-02-13 devnull {
117 6e527fbc 2005-02-13 devnull 	int n;
118 6e527fbc 2005-02-13 devnull 	Rpc *r;
119 6e527fbc 2005-02-13 devnull 	char *s;
120 6e527fbc 2005-02-13 devnull 
121 6e527fbc 2005-02-13 devnull 	for(;;){
122 6e527fbc 2005-02-13 devnull 		r = convgetrpc(c, RpcWrite);
123 6e527fbc 2005-02-13 devnull 		if(r == nil)
124 6e527fbc 2005-02-13 devnull 			return -1;
125 6e527fbc 2005-02-13 devnull 		n = (*done)(r->data, r->count);
126 6e527fbc 2005-02-13 devnull 		if(n == r->count)
127 6e527fbc 2005-02-13 devnull 			break;
128 6e527fbc 2005-02-13 devnull 		rpcrespond(c, "toosmall %d", n);
129 6e527fbc 2005-02-13 devnull 	}
130 6e527fbc 2005-02-13 devnull 
131 6e527fbc 2005-02-13 devnull 	s = emalloc(r->count+1);
132 6e527fbc 2005-02-13 devnull 	memmove(s, r->data, r->count);
133 6e527fbc 2005-02-13 devnull 	s[r->count] = 0;
134 6e527fbc 2005-02-13 devnull 	*ps = s;
135 6e527fbc 2005-02-13 devnull 	rpcrespond(c, "ok");
136 6e527fbc 2005-02-13 devnull 	return r->count;
137 6e527fbc 2005-02-13 devnull }
138 6e527fbc 2005-02-13 devnull 
139 6e527fbc 2005-02-13 devnull /*
140 6e527fbc 2005-02-13 devnull  * read until we get a non-zero write.  assumes remote side
141 6e527fbc 2005-02-13 devnull  * knows something about the protocol (is not auth_proxy).
142 6e527fbc 2005-02-13 devnull  * the remote side typically won't bother with the zero-length
143 6e527fbc 2005-02-13 devnull  * write to find out the length -- the loop is there only so the
144 6e527fbc 2005-02-13 devnull  * test program can call auth_proxy on both sides of a pipe
145 6e527fbc 2005-02-13 devnull  * to play a conversation.
146 6e527fbc 2005-02-13 devnull  */
147 6e527fbc 2005-02-13 devnull int
148 6e527fbc 2005-02-13 devnull convreadm(Conv *c, char **ps)
149 6e527fbc 2005-02-13 devnull {
150 6e527fbc 2005-02-13 devnull 	char *s;
151 6e527fbc 2005-02-13 devnull 	Rpc *r;
152 6e527fbc 2005-02-13 devnull 
153 6e527fbc 2005-02-13 devnull 	for(;;){
154 6e527fbc 2005-02-13 devnull 		r = convgetrpc(c, RpcWrite);
155 6e527fbc 2005-02-13 devnull 		if(r == nil)
156 6e527fbc 2005-02-13 devnull 			return -1;
157 6e527fbc 2005-02-13 devnull 		if(r->count > 0)
158 6e527fbc 2005-02-13 devnull 			break;
159 6e527fbc 2005-02-13 devnull 		rpcrespond(c, "toosmall %d", AuthRpcMax);
160 6e527fbc 2005-02-13 devnull 	}
161 6e527fbc 2005-02-13 devnull 	s = emalloc(r->count+1);
162 6e527fbc 2005-02-13 devnull 	memmove(s, r->data, r->count);
163 6e527fbc 2005-02-13 devnull 	s[r->count] = 0;
164 6e527fbc 2005-02-13 devnull 	*ps = s;
165 6e527fbc 2005-02-13 devnull 	rpcrespond(c, "ok");
166 6e527fbc 2005-02-13 devnull 	return r->count;
167 6e527fbc 2005-02-13 devnull }
168 6e527fbc 2005-02-13 devnull 
169 6e527fbc 2005-02-13 devnull /* read exactly count bytes */
170 6e527fbc 2005-02-13 devnull int
171 6e527fbc 2005-02-13 devnull convread(Conv *c, void *data, int count)
172 6e527fbc 2005-02-13 devnull {
173 6e527fbc 2005-02-13 devnull 	Rpc *r;
174 6e527fbc 2005-02-13 devnull 
175 6e527fbc 2005-02-13 devnull 	for(;;){
176 6e527fbc 2005-02-13 devnull 		r = convgetrpc(c, RpcWrite);
177 6e527fbc 2005-02-13 devnull 		if(r == nil)
178 6e527fbc 2005-02-13 devnull 			return -1;
179 6e527fbc 2005-02-13 devnull 		if(r->count == count)
180 6e527fbc 2005-02-13 devnull 			break;
181 6e527fbc 2005-02-13 devnull 		if(r->count < count)
182 6e527fbc 2005-02-13 devnull 			rpcrespond(c, "toosmall %d", count);
183 6e527fbc 2005-02-13 devnull 		else
184 6e527fbc 2005-02-13 devnull 			rpcrespond(c, "error too much data; want %d got %d", count, r->count);
185 6e527fbc 2005-02-13 devnull 	}
186 6e527fbc 2005-02-13 devnull 	memmove(data, r->data, count);
187 6e527fbc 2005-02-13 devnull 	rpcrespond(c, "ok");
188 6e527fbc 2005-02-13 devnull 	return 0;
189 6e527fbc 2005-02-13 devnull }
190 6e527fbc 2005-02-13 devnull 
191 6e527fbc 2005-02-13 devnull /* write exactly count bytes */
192 6e527fbc 2005-02-13 devnull int
193 6e527fbc 2005-02-13 devnull convwrite(Conv *c, void *data, int count)
194 6e527fbc 2005-02-13 devnull {
195 6e527fbc 2005-02-13 devnull 	Rpc *r;
196 6e527fbc 2005-02-13 devnull 
197 1f8a8072 2005-03-15 devnull 	r = convgetrpc(c, RpcRead);
198 1f8a8072 2005-03-15 devnull 	if(r == nil)
199 1f8a8072 2005-03-15 devnull 		return -1;
200 6e527fbc 2005-02-13 devnull 	rpcrespondn(c, "ok", data, count);
201 6e527fbc 2005-02-13 devnull 	return 0;
202 6e527fbc 2005-02-13 devnull }
203 6e527fbc 2005-02-13 devnull 
204 6e527fbc 2005-02-13 devnull /* print to the conversation */
205 6e527fbc 2005-02-13 devnull int
206 6e527fbc 2005-02-13 devnull convprint(Conv *c, char *fmt, ...)
207 6e527fbc 2005-02-13 devnull {
208 6e527fbc 2005-02-13 devnull 	char *s;
209 6e527fbc 2005-02-13 devnull 	va_list arg;
210 6e527fbc 2005-02-13 devnull 	int ret;
211 6e527fbc 2005-02-13 devnull 
212 6e527fbc 2005-02-13 devnull 	va_start(arg, fmt);
213 6e527fbc 2005-02-13 devnull 	s = vsmprint(fmt, arg);
214 6e527fbc 2005-02-13 devnull 	va_end(arg);
215 6e527fbc 2005-02-13 devnull 	if(s == nil)
216 6e527fbc 2005-02-13 devnull 		return -1;
217 6e527fbc 2005-02-13 devnull 	ret = convwrite(c, s, strlen(s));
218 6e527fbc 2005-02-13 devnull 	free(s);
219 6e527fbc 2005-02-13 devnull 	return ret;
220 6e527fbc 2005-02-13 devnull }
221 6e527fbc 2005-02-13 devnull 
222 6e527fbc 2005-02-13 devnull /* ask for a key */
223 6e527fbc 2005-02-13 devnull int
224 6e527fbc 2005-02-13 devnull convneedkey(Conv *c, Attr *a)
225 6e527fbc 2005-02-13 devnull {
226 6e527fbc 2005-02-13 devnull 	/*
227 6e527fbc 2005-02-13 devnull 	 * Piggyback key requests in the usual RPC channel.
228 6e527fbc 2005-02-13 devnull 	 * Wait for the next RPC and then send a key request
229 6e527fbc 2005-02-13 devnull 	 * in response.  The keys get added out-of-band (via the
230 6e527fbc 2005-02-13 devnull 	 * ctl file), so assume the key has been added when the
231 6e527fbc 2005-02-13 devnull 	 * next request comes in.
232 5f6612ba 2008-05-31 rsc 	 *
233 5f6612ba 2008-05-31 rsc 	 * The convgetrpc seems dodgy, because we might be in
234 5f6612ba 2008-05-31 rsc 	 * the middle of an rpc, and what about the one that comes
235 5f6612ba 2008-05-31 rsc 	 * in later?  It's all actually okay: convgetrpc is idempotent
236 5f6612ba 2008-05-31 rsc 	 * until rpcrespond is called, so if we're in the middle of an rpc,
237 5f6612ba 2008-05-31 rsc 	 * the first convgetrpc is a no-op, the rpcrespond sends back
238 5f6612ba 2008-05-31 rsc 	 * the needkey, and then the client repeats the rpc we're in
239 5f6612ba 2008-05-31 rsc 	 * the middle of.  Otherwise, if we're not in the middle of an
240 5f6612ba 2008-05-31 rsc 	 * rpc, the first convgetrpc waits for one, we respond needkey,
241 5f6612ba 2008-05-31 rsc 	 * and then the second convgetrpc waits for another.  Because
242 5f6612ba 2008-05-31 rsc 	 * there is no second response, eventually the caller will get
243 5f6612ba 2008-05-31 rsc 	 * around to asking for an rpc itself, at which point the already
244 5f6612ba 2008-05-31 rsc 	 * gotten rpc will be returned again.
245 6e527fbc 2005-02-13 devnull 	 */
246 6e527fbc 2005-02-13 devnull 	if(convgetrpc(c, -1) == nil)
247 6e527fbc 2005-02-13 devnull 		return -1;
248 a2f6b810 2011-01-02 rsc 	if(conv->proto)
249 a2f6b810 2011-01-02 rsc 		a = addattrs(parseattr(c->proto->keyprompt), a);
250 5f6612ba 2008-05-31 rsc 	flog("convneedkey %A", a);
251 6e527fbc 2005-02-13 devnull 	rpcrespond(c, "needkey %A", a);
252 6e527fbc 2005-02-13 devnull 	if(convgetrpc(c, -1) == nil)
253 6e527fbc 2005-02-13 devnull 		return -1;
254 5f6612ba 2008-05-31 rsc 	flog("convneedkey returning");
255 6e527fbc 2005-02-13 devnull 	return 0;
256 6e527fbc 2005-02-13 devnull }
257 6e527fbc 2005-02-13 devnull 
258 6e527fbc 2005-02-13 devnull /* ask for a replacement for a bad key*/
259 6e527fbc 2005-02-13 devnull int
260 6e527fbc 2005-02-13 devnull convbadkey(Conv *c, Key *k, char *msg, Attr *a)
261 6e527fbc 2005-02-13 devnull {
262 6e527fbc 2005-02-13 devnull 	if(convgetrpc(c, -1) == nil)
263 6e527fbc 2005-02-13 devnull 		return -1;
264 5f6612ba 2008-05-31 rsc 	flog("convbadkey %A %N / %s / %A", k->attr, k->privattr, msg, a);
265 6e527fbc 2005-02-13 devnull 	rpcrespond(c, "badkey %A %N\n%s\n%A",
266 6e527fbc 2005-02-13 devnull 		k->attr, k->privattr, msg, a);
267 6e527fbc 2005-02-13 devnull 	if(convgetrpc(c, -1) == nil)
268 6e527fbc 2005-02-13 devnull 		return -1;
269 6e527fbc 2005-02-13 devnull 	return 0;
270 6e527fbc 2005-02-13 devnull }
271 6e527fbc 2005-02-13 devnull