3 * - output and logging support
4 * - program lifetime support
5 * - IP address and subnet munging routines
6 * - MPI convenience functions
10 * Copyright (C) 1995--2001 Stephen Early <steve@greenend.org.uk>
12 * It is part of secnet, which is
13 * Copyright (C) 1995--2001 Stephen Early <steve@greenend.org.uk>
14 * Copyright (C) 1998 Ross Anderson, Eli Biham, Lars Knudsen
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License as published by
18 * the Free Software Foundation; either version 2, or (at your option)
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 * GNU General Public License for more details.
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, write to the Free Software Foundation,
28 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
40 #include "unaligned.h"
42 #define MIN_BUFFER_SIZE 64
43 #define DEFAULT_BUFFER_SIZE 4096
44 #define MAX_BUFFER_SIZE 131072
46 static const char *hexdigits="0123456789abcdef";
48 uint32_t current_phase=0;
53 struct phase_hook *next;
56 static struct phase_hook *hooks[NR_PHASES]={NULL,};
58 char *safe_strdup(const char *s, const char *message)
63 fatal_perror(message);
68 void *safe_malloc(size_t size, const char *message)
73 fatal_perror(message);
77 void *safe_malloc_ary(size_t size, size_t count, const char *message) {
78 if (count >= INT_MAX/size) {
79 fatal("array allocation overflow: %s", message);
81 return safe_malloc(size*count, message);
84 /* Convert a buffer into its MP_INT representation */
85 void read_mpbin(MP_INT *a, uint8_t *bin, int binsize)
90 buff=safe_malloc(binsize*2 + 1,"read_mpbin");
92 for (i=0; i<binsize; i++) {
93 buff[i*2]=hexdigits[(bin[i] & 0xf0) >> 4];
94 buff[i*2+1]=hexdigits[(bin[i] & 0xf)];
98 mpz_set_str(a, buff, 16);
102 /* Convert a MP_INT into a hex string */
103 char *write_mpstring(MP_INT *a)
107 buff=safe_malloc(mpz_sizeinbase(a,16)+2,"write_mpstring");
108 mpz_get_str(buff, 16, a);
112 static uint8_t hexval(uint8_t c)
141 /* Convert a MP_INT into a buffer; return length; truncate if necessary */
142 int32_t write_mpbin(MP_INT *a, uint8_t *buffer, int32_t buflen)
147 if (buflen==0) return 0;
148 hb=write_mpstring(a);
153 /* The number starts with a half-byte */
154 buffer[i++]=hexval(hb[j++]);
156 for (; hb[j] && i<buflen; i++) {
157 buffer[i]=(hexval(hb[j])<<4)|hexval(hb[j+1]);
164 static const char *phases[NR_PHASES]={
169 "PHASE_GETRESOURCES",
175 void enter_phase(uint32_t new_phase)
177 struct phase_hook *i;
179 if (hooks[new_phase])
180 Message(M_DEBUG_PHASE,"Running hooks for %s...\n", phases[new_phase]);
181 current_phase=new_phase;
183 for (i=hooks[new_phase]; i; i=i->next)
184 i->fn(i->state, new_phase);
185 Message(M_DEBUG_PHASE,"Now in %s\n",phases[new_phase]);
188 bool_t add_hook(uint32_t phase, hook_fn *fn, void *state)
190 struct phase_hook *h;
192 h=safe_malloc(sizeof(*h),"add_hook");
195 h->next=hooks[phase];
200 bool_t remove_hook(uint32_t phase, hook_fn *fn, void *state)
202 fatal("remove_hook: not implemented");
207 void vslilog(struct log_if *lf, int priority, const char *message, va_list ap)
209 lf->vlog(lf->st,priority,message,ap);
212 void slilog(struct log_if *lf, int priority, const char *message, ...)
216 va_start(ap,message);
217 vslilog(lf,priority,message,ap);
223 struct buffer_if ops;
226 void buffer_assert_free(struct buffer_if *buffer, cstring_t file,
230 fatal("BUF_ASSERT_FREE, %s line %d, owned by %s",
231 file,line,buffer->owner);
235 void buffer_assert_used(struct buffer_if *buffer, cstring_t file,
239 fatal("BUF_ASSERT_USED, %s line %d, last owned by %s",
240 file,line,buffer->owner);
244 void buffer_init(struct buffer_if *buffer, int32_t max_start_pad)
246 buffer->start=buffer->base+max_start_pad;
250 void *buf_append(struct buffer_if *buf, int32_t amount) {
252 assert(buf->size <= buf->len - amount);
253 p=buf->start + buf->size;
258 void *buf_prepend(struct buffer_if *buf, int32_t amount) {
259 assert(amount <= buf->start - buf->base);
261 return buf->start-=amount;
264 void *buf_unappend(struct buffer_if *buf, int32_t amount) {
265 if (buf->size < amount) return 0;
266 return buf->start+(buf->size-=amount);
269 void *buf_unprepend(struct buffer_if *buf, int32_t amount) {
277 /* Append a two-byte length and the string to the buffer. Length is in
278 network byte order. */
279 void buf_append_string(struct buffer_if *buf, cstring_t s)
284 /* fixme: if string is longer than 65535, result is a corrupted packet */
285 buf_append_uint16(buf,len);
286 memcpy(buf_append(buf,len),s,len);
289 void buffer_new(struct buffer_if *buf, int32_t len)
299 buf->base=safe_malloc(len,"buffer_new");
302 static list_t *buffer_apply(closure_t *self, struct cloc loc, dict_t *context,
308 bool_t lockdown=False;
309 uint32_t len=DEFAULT_BUFFER_SIZE;
311 st=safe_malloc(sizeof(*st),"buffer_apply");
312 st->cl.description="buffer";
313 st->cl.type=CL_BUFFER;
315 st->cl.interface=&st->ops;
317 /* First argument, if present, is buffer length */
318 item=list_elem(args,0);
320 if (item->type!=t_number) {
321 cfgfatal(st->ops.loc,"buffer","first parameter must be a "
322 "number (buffer size)\n");
324 len=item->data.number;
325 if (len<MIN_BUFFER_SIZE) {
326 cfgfatal(st->ops.loc,"buffer","ludicrously small buffer size\n");
328 if (len>MAX_BUFFER_SIZE) {
329 cfgfatal(st->ops.loc,"buffer","ludicrously large buffer size\n");
332 /* Second argument, if present, is a dictionary */
333 item=list_elem(args,1);
335 if (item->type!=t_dict) {
336 cfgfatal(st->ops.loc,"buffer","second parameter must be a "
339 dict=item->data.dict;
340 lockdown=dict_read_bool(dict,"lockdown",False,"buffer",st->ops.loc,
344 buffer_new(&st->ops,len);
346 /* XXX mlock the buffer if possible */
349 return new_closure(&st->cl);
352 void util_module(dict_t *dict)
354 add_closure(dict,"sysbuffer",buffer_apply);