1 /*
2  * Copyright (c) 2020, 2021 Tracey Emery <tracey@openbsd.org>
3  * Copyright (c) 2020 Stefan Sperling <stsp@openbsd.org>
4  * Copyright (c) 2004, 2005 Esben Norby <norby@openbsd.org>
5  * Copyright (c) 2004 Ryan McBride <mcbride@openbsd.org>
6  * Copyright (c) 2002, 2003, 2004 Henning Brauer <henning@openbsd.org>
7  * Copyright (c) 2001 Markus Friedl.  All rights reserved.
8  * Copyright (c) 2001 Daniel Hartmeier.  All rights reserved.
9  * Copyright (c) 2001 Theo de Raadt.  All rights reserved.
10  *
11  * Permission to use, copy, modify, and distribute this software for any
12  * purpose with or without fee is hereby granted, provided that the above
13  * copyright notice and this permission notice appear in all copies.
14  *
15  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
16  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
17  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
18  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
19  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
20  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
21  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
22  */
23 
24 %{
25 #include <sys/types.h>
26 #include <sys/queue.h>
27 
28 #include <netdb.h>
29 
30 #include <ctype.h>
31 #include <err.h>
32 #include <errno.h>
33 #include <limits.h>
34 #include <stdarg.h>
35 #include <stdio.h>
36 #include <stdlib.h>
37 #include <string.h>
38 
39 #include "got_error.h"
40 #include "gotconfig.h"
41 
42 static struct file {
43 	FILE			*stream;
44 	const char		*name;
45 	size_t	 		 ungetpos;
46 	size_t			 ungetsize;
47 	u_char			*ungetbuf;
48 	int			 eof_reached;
49 	int			 lineno;
50 } *file;
51 static const struct got_error*	newfile(struct file**, const char *, int *);
52 static void	closefile(struct file *);
53 int		 yyparse(void);
54 int		 yylex(void);
55 int		 yyerror(const char *, ...)
56     __attribute__((__format__ (printf, 1, 2)))
57     __attribute__((__nonnull__ (1)));
58 int		 kw_cmp(const void *, const void *);
59 int		 lookup(char *);
60 int		 igetc(void);
61 int		 lgetc(int);
62 void		 lungetc(int);
63 int		 findeol(void);
64 static int	 parseport(char *, long long *);
65 
66 TAILQ_HEAD(symhead, sym)	 symhead = TAILQ_HEAD_INITIALIZER(symhead);
67 struct sym {
68 	TAILQ_ENTRY(sym)	 entry;
69 	int			 used;
70 	int			 persist;
71 	char			*nam;
72 	char			*val;
73 };
74 
75 int	 symset(const char *, const char *, int);
76 int	 cmdline_symset(char *);
77 char	*symget(const char *);
78 
79 static int	 atoul(char *, u_long *);
80 
81 static const struct got_error* gerror;
82 static struct gotconfig_remote_repo *remote;
83 static struct gotconfig gotconfig;
84 static const struct got_error* new_remote(struct gotconfig_remote_repo **);
85 static const struct got_error* new_fetch_config(struct fetch_config **);
86 static const struct got_error* new_send_config(struct send_config **);
87 
88 typedef struct {
89 	union {
90 		long long	 number;
91 		char		*string;
92 		struct node_branch *branch;
93 		struct node_ref *ref;
94 	} v;
95 	int lineno;
96 } YYSTYPE;
97 
98 %}
99 
100 %token	ERROR
101 %token	REMOTE REPOSITORY SERVER PORT PROTOCOL MIRROR_REFERENCES BRANCH
102 %token	AUTHOR ALLOWED_SIGNERS REVOKED_SIGNERS FETCH_ALL_BRANCHES REFERENCE
103 %token	FETCH SEND
104 %token	<v.string>	STRING
105 %token	<v.number>	NUMBER
106 %type	<v.number>	boolean portplain
107 %type	<v.string>	numberstring
108 %type	<v.branch>	branch xbranch branch_list
109 %type	<v.ref>		ref xref ref_list
110 
111 %%
112 
113 grammar		: /* empty */
114 		| grammar '\n'
115 		| grammar author '\n'
116 		| grammar remote '\n'
117 		| grammar allowed_signers '\n'
118 		;
119 boolean		: STRING {
120 			if (strcasecmp($1, "true") == 0 ||
121 			    strcasecmp($1, "yes") == 0)
122 				$$ = 1;
123 			else if (strcasecmp($1, "false") == 0 ||
124 			    strcasecmp($1, "no") == 0)
125 				$$ = 0;
126 			else {
127 				yyerror("invalid boolean value '%s'", $1);
128 				free($1);
129 				YYERROR;
130 			}
131 			free($1);
132 		}
133 		;
134 numberstring	: NUMBER				{
135 			char	*s;
136 			if (asprintf(&s, "%lld", $1) == -1) {
137 				yyerror("string: asprintf");
138 				YYERROR;
139 			}
140 			$$ = s;
141 		}
142 		| STRING
143 		;
144 portplain	: numberstring	{
145 			if (parseport($1, &$$) == -1) {
146 				free($1);
147 				YYERROR;
148 			}
149 			free($1);
150 		}
151 		;
152 branch		: /* empty */				{ $$ = NULL; }
153 		| xbranch			{ $$ = $1; }
154 		| '{' optnl branch_list '}'	{ $$ = $3; }
155 		;
156 xbranch		: STRING {
157 			$$ = calloc(1, sizeof(struct node_branch));
158 			if ($$ == NULL) {
159 				yyerror("calloc");
160 				YYERROR;
161 			}
162 			$$->branch_name = $1;
163 			$$->tail = $$;
164 		}
165 		;
166 branch_list	: xbranch optnl			{ $$ = $1; }
167 		| branch_list comma xbranch optnl {
168 			$1->tail->next = $3;
169 			$1->tail = $3;
170 			$$ = $1;
171 		}
172 		;
173 ref		: /* empty */		{ $$ = NULL; }
174 		| xref			{ $$ = $1; }
175 		| '{' optnl ref_list '}'	{ $$ = $3; }
176 		;
177 xref		: STRING {
178 			$$ = calloc(1, sizeof(struct node_ref));
179 			if ($$ == NULL) {
180 				yyerror("calloc");
181 				YYERROR;
182 			}
183 			$$->ref_name = $1;
184 			$$->tail = $$;
185 		}
186 		;
187 ref_list	: xref optnl			{ $$ = $1; }
188 		| ref_list comma xref optnl {
189 			$1->tail->next = $3;
190 			$1->tail = $3;
191 			$$ = $1;
192 		}
193 		;
194 remoteopts2	: remoteopts2 remoteopts1 nl
195 		| remoteopts1 optnl
196 		;
197 remoteopts1	: REPOSITORY STRING {
198 			remote->repository = $2;
199 		}
200 		| SERVER STRING {
201 			remote->server = $2;
202 		}
203 		| PROTOCOL STRING {
204 			remote->protocol = $2;
205 		}
206 		| MIRROR_REFERENCES boolean {
207 			remote->mirror_references = $2;
208 		}
209 		| FETCH_ALL_BRANCHES boolean {
210 			remote->fetch_all_branches = $2;
211 		}
212 		| PORT portplain {
213 			remote->port = $2;
214 		}
215 		| BRANCH branch {
216 			remote->branch = $2;
217 		}
218 		| REFERENCE ref {
219 			remote->fetch_ref = $2;
220 		}
221 		| FETCH {
222 			static const struct got_error* error;
223 
224 			if (remote->fetch_config != NULL) {
225 				yyerror("fetch block already exists");
226 				YYERROR;
227 			}
228 			error = new_fetch_config(&remote->fetch_config);
229 			if (error) {
230 				yyerror("%s", error->msg);
231 				YYERROR;
232 			}
233 		} '{' optnl fetchempty '}'
234 		| SEND {
235 			static const struct got_error* error;
236 
237 			if (remote->send_config != NULL) {
238 				yyerror("send block already exists");
239 				YYERROR;
240 			}
241 			error = new_send_config(&remote->send_config);
242 			if (error) {
243 				yyerror("%s", error->msg);
244 				YYERROR;
245 			}
246 		} '{' optnl sendempty '}'
247 		;
248 fetchempty	: /* empty */
249 		| fetchopts2
250 		;
251 fetchopts2	: fetchopts2 fetchopts1 nl
252 		| fetchopts1 optnl
253 		;
254 fetchopts1	: REPOSITORY STRING {
255 			remote->fetch_config->repository = $2;
256 		}
257 		| SERVER STRING {
258 			remote->fetch_config->server = $2;
259 		}
260 		| PROTOCOL STRING {
261 			remote->fetch_config->protocol = $2;
262 		}
263 		| PORT portplain {
264 			remote->fetch_config->port = $2;
265 		}
266 		| BRANCH branch {
267 			remote->fetch_config->branch = $2;
268 		}
269 		;
270 sendempty	: /* empty */
271 		| sendopts2
272 		;
273 sendopts2	: sendopts2 sendopts1 nl
274 		| sendopts1 optnl
275 		;
276 sendopts1	: REPOSITORY STRING {
277 			remote->send_config->repository = $2;
278 		}
279 		| SERVER STRING {
280 			remote->send_config->server = $2;
281 		}
282 		| PROTOCOL STRING {
283 			remote->send_config->protocol = $2;
284 		}
285 		| PORT portplain {
286 			remote->send_config->port = $2;
287 		}
288 		| BRANCH branch {
289 			remote->send_config->branch = $2;
290 		}
291 		;
292 remote		: REMOTE STRING {
293 			static const struct got_error* error;
294 
295 			error = new_remote(&remote);
296 			if (error) {
297 				free($2);
298 				yyerror("%s", error->msg);
299 				YYERROR;
300 			}
301 			remote->name = $2;
302 		} '{' optnl remoteopts2 '}' {
303 			TAILQ_INSERT_TAIL(&gotconfig.remotes, remote, entry);
304 			gotconfig.nremotes++;
305 		}
306 		;
307 author		: AUTHOR STRING {
308 			gotconfig.author = $2;
309 		}
310 		;
311 allowed_signers	: ALLOWED_SIGNERS STRING {
312 			gotconfig.allowed_signers_file = $2;
313 		}
314 		;
315 revoked_signers	: REVOKED_SIGNERS STRING {
316 			gotconfig.revoked_signers_file = $2;
317 		}
318 		;
319 optnl		: '\n' optnl
320 		| /* empty */
321 		;
322 nl		: '\n' optnl
323 		;
324 comma		: ','
325 		| /* empty */
326 		;
327 %%
328 
329 struct keywords {
330 	const char	*k_name;
331 	int		 k_val;
332 };
333 
334 int
335 yyerror(const char *fmt, ...)
336 {
337 	va_list		 ap;
338 	char		*msg;
339 	char		*err = NULL;
340 
341 	va_start(ap, fmt);
342 	if (vasprintf(&msg, fmt, ap) == -1) {
343 		gerror =  got_error_from_errno("vasprintf");
344 		return 0;
345 	}
346 	va_end(ap);
347 	if (asprintf(&err, "%s: line %d: %s", file->name, yylval.lineno,
348 	    msg) == -1) {
349 		gerror = got_error_from_errno("asprintf");
350 		return(0);
351 	}
352 	gerror = got_error_msg(GOT_ERR_PARSE_CONFIG, err);
353 	free(msg);
354 	return(0);
355 }
356 int
357 kw_cmp(const void *k, const void *e)
358 {
359 	return (strcmp(k, ((const struct keywords *)e)->k_name));
360 }
361 
362 int
363 lookup(char *s)
364 {
365 	/* This has to be sorted always. */
366 	static const struct keywords keywords[] = {
367 		{"allowed_signers",	ALLOWED_SIGNERS},
368 		{"author",		AUTHOR},
369 		{"branch",		BRANCH},
370 		{"fetch",		FETCH},
371 		{"fetch-all-branches",	FETCH_ALL_BRANCHES},
372 		{"mirror-references",	MIRROR_REFERENCES},
373 		{"port",		PORT},
374 		{"protocol",		PROTOCOL},
375 		{"reference",		REFERENCE},
376 		{"remote",		REMOTE},
377 		{"repository",		REPOSITORY},
378 		{"revoked_signers",	REVOKED_SIGNERS},
379 		{"send",		SEND},
380 		{"server",		SERVER},
381 	};
382 	const struct keywords	*p;
383 
384 	p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]),
385 	    sizeof(keywords[0]), kw_cmp);
386 
387 	if (p)
388 		return (p->k_val);
389 	else
390 		return (STRING);
391 }
392 
393 #define START_EXPAND	1
394 #define DONE_EXPAND	2
395 
396 static int	expanding;
397 
398 int
399 igetc(void)
400 {
401 	int	c;
402 
403 	while (1) {
404 		if (file->ungetpos > 0)
405 			c = file->ungetbuf[--file->ungetpos];
406 		else
407 			c = getc(file->stream);
408 
409 		if (c == START_EXPAND)
410 			expanding = 1;
411 		else if (c == DONE_EXPAND)
412 			expanding = 0;
413 		else
414 			break;
415 	}
416 	return (c);
417 }
418 
419 int
420 lgetc(int quotec)
421 {
422 	int		c, next;
423 
424 	if (quotec) {
425 		c = igetc();
426 		if (c == EOF) {
427 			yyerror("reached end of file while parsing "
428 			    "quoted string");
429 		}
430 		return (c);
431 	}
432 
433 	c = igetc();
434 	while (c == '\\') {
435 		next = igetc();
436 		if (next != '\n') {
437 			c = next;
438 			break;
439 		}
440 		yylval.lineno = file->lineno;
441 		file->lineno++;
442 	}
443 
444 	return (c);
445 }
446 
447 void
448 lungetc(int c)
449 {
450 	if (c == EOF)
451 		return;
452 
453 	if (file->ungetpos >= file->ungetsize) {
454 		void *p = reallocarray(file->ungetbuf, file->ungetsize, 2);
455 		if (p == NULL)
456 			err(1, "%s", __func__);
457 		file->ungetbuf = p;
458 		file->ungetsize *= 2;
459 	}
460 	file->ungetbuf[file->ungetpos++] = c;
461 }
462 
463 int
464 findeol(void)
465 {
466 	int	c;
467 
468 	/* Skip to either EOF or the first real EOL. */
469 	while (1) {
470 		c = lgetc(0);
471 		if (c == '\n') {
472 			file->lineno++;
473 			break;
474 		}
475 		if (c == EOF)
476 			break;
477 	}
478 	return (ERROR);
479 }
480 
481 static long long
482 getservice(char *n)
483 {
484 	struct servent	*s;
485 	u_long		 ulval;
486 
487 	if (atoul(n, &ulval) == 0) {
488 		if (ulval == 0 || ulval > 65535) {
489 			yyerror("illegal port value %lu", ulval);
490 			return (-1);
491 		}
492 		return ulval;
493 	} else {
494 		s = getservbyname(n, "tcp");
495 		if (s == NULL)
496 			s = getservbyname(n, "udp");
497 		if (s == NULL) {
498 			yyerror("unknown port %s", n);
499 			return (-1);
500 		}
501 		return (s->s_port);
502 	}
503 }
504 
505 static int
506 parseport(char *port, long long *pn)
507 {
508 	if ((*pn = getservice(port)) == -1) {
509 		*pn = 0LL;
510 		return (-1);
511 	}
512 	return (0);
513 }
514 
515 
516 int
517 yylex(void)
518 {
519 	char	 buf[8096];
520 	char	*p, *val;
521 	int	 quotec, next, c;
522 	int	 token;
523 
524 top:
525 	p = buf;
526 	c = lgetc(0);
527 	while (c == ' ' || c == '\t')
528 		c = lgetc(0); /* nothing */
529 
530 	yylval.lineno = file->lineno;
531 	if (c == '#') {
532 		c = lgetc(0);
533 		while (c != '\n' && c != EOF)
534 			c = lgetc(0); /* nothing */
535 	}
536 	if (c == '$' && !expanding) {
537 		while (1) {
538 			c = lgetc(0);
539 			if (c == EOF)
540 				return (0);
541 
542 			if (p + 1 >= buf + sizeof(buf) - 1) {
543 				yyerror("string too long");
544 				return (findeol());
545 			}
546 			if (isalnum(c) || c == '_') {
547 				*p++ = c;
548 				continue;
549 			}
550 			*p = '\0';
551 			lungetc(c);
552 			break;
553 		}
554 		val = symget(buf);
555 		if (val == NULL) {
556 			yyerror("macro '%s' not defined", buf);
557 			return (findeol());
558 		}
559 		p = val + strlen(val) - 1;
560 		lungetc(DONE_EXPAND);
561 		while (p >= val) {
562 			lungetc((unsigned char)*p);
563 			p--;
564 		}
565 		lungetc(START_EXPAND);
566 		goto top;
567 	}
568 
569 	switch (c) {
570 	case '\'':
571 	case '"':
572 		quotec = c;
573 		while (1) {
574 			c = lgetc(quotec);
575 			if (c == EOF)
576 				return (0);
577 			if (c == '\n') {
578 				file->lineno++;
579 				continue;
580 			} else if (c == '\\') {
581 				next = lgetc(quotec);
582 				if (next == EOF)
583 					return (0);
584 				if (next == quotec || c == ' ' || c == '\t')
585 					c = next;
586 				else if (next == '\n') {
587 					file->lineno++;
588 					continue;
589 				} else
590 					lungetc(next);
591 			} else if (c == quotec) {
592 				*p = '\0';
593 				break;
594 			} else if (c == '\0') {
595 				yyerror("syntax error");
596 				return (findeol());
597 			}
598 			if (p + 1 >= buf + sizeof(buf) - 1) {
599 				yyerror("string too long");
600 				return (findeol());
601 			}
602 			*p++ = c;
603 		}
604 		yylval.v.string = strdup(buf);
605 		if (yylval.v.string == NULL)
606 			err(1, "%s", __func__);
607 		return (STRING);
608 	}
609 
610 #define allowed_to_end_number(x) \
611 	(isspace(x) || x == ')' || x ==',' || x == '/' || x == '}' || x == '=')
612 
613 	if (c == '-' || isdigit(c)) {
614 		do {
615 			*p++ = c;
616 			if ((size_t)(p-buf) >= sizeof(buf)) {
617 				yyerror("string too long");
618 				return (findeol());
619 			}
620 			c = lgetc(0);
621 		} while (c != EOF && isdigit(c));
622 		lungetc(c);
623 		if (p == buf + 1 && buf[0] == '-')
624 			goto nodigits;
625 		if (c == EOF || allowed_to_end_number(c)) {
626 			const char *errstr = NULL;
627 
628 			*p = '\0';
629 			yylval.v.number = strtonum(buf, LLONG_MIN,
630 			    LLONG_MAX, &errstr);
631 			if (errstr) {
632 				yyerror("\"%s\" invalid number: %s",
633 				    buf, errstr);
634 				return (findeol());
635 			}
636 			return (NUMBER);
637 		} else {
638 nodigits:
639 			while (p > buf + 1)
640 				lungetc((unsigned char)*--p);
641 			c = (unsigned char)*--p;
642 			if (c == '-')
643 				return (c);
644 		}
645 	}
646 
647 #define allowed_in_string(x) \
648 	(isalnum(x) || (ispunct(x) && x != '(' && x != ')' && \
649 	x != '{' && x != '}' && \
650 	x != '!' && x != '=' && x != '#' && \
651 	x != ','))
652 
653 	if (isalnum(c) || c == ':' || c == '_') {
654 		do {
655 			*p++ = c;
656 			if ((size_t)(p-buf) >= sizeof(buf)) {
657 				yyerror("string too long");
658 				return (findeol());
659 			}
660 			c = lgetc(0);
661 		} while (c != EOF && (allowed_in_string(c)));
662 		lungetc(c);
663 		*p = '\0';
664 		token = lookup(buf);
665 		if (token == STRING) {
666 			yylval.v.string = strdup(buf);
667 			if (yylval.v.string == NULL)
668 				err(1, "%s", __func__);
669 		}
670 		return (token);
671 	}
672 	if (c == '\n') {
673 		yylval.lineno = file->lineno;
674 		file->lineno++;
675 	}
676 	if (c == EOF)
677 		return (0);
678 	return (c);
679 }
680 
681 static const struct got_error*
682 newfile(struct file **nfile, const char *filename, int *fd)
683 {
684 	const struct got_error* error = NULL;
685 
686 	(*nfile) = calloc(1, sizeof(struct file));
687 	if ((*nfile) == NULL)
688 		return got_error_from_errno("calloc");
689 	(*nfile)->stream = fdopen(*fd, "r");
690 	if ((*nfile)->stream == NULL) {
691 		error = got_error_from_errno("fdopen");
692 		free((*nfile));
693 		return error;
694 	}
695 	*fd = -1; /* Stream owns the file descriptor now. */
696 	(*nfile)->name = filename;
697 	(*nfile)->lineno = 1;
698 	(*nfile)->ungetsize = 16;
699 	(*nfile)->ungetbuf = malloc((*nfile)->ungetsize);
700 	if ((*nfile)->ungetbuf == NULL) {
701 		error = got_error_from_errno("malloc");
702 		fclose((*nfile)->stream);
703 		free((*nfile));
704 		return error;
705 	}
706 	return NULL;
707 }
708 
709 static const struct got_error*
710 new_remote(struct gotconfig_remote_repo **remote)
711 {
712 	const struct got_error *error = NULL;
713 
714 	*remote = calloc(1, sizeof(**remote));
715 	if (*remote == NULL)
716 		error = got_error_from_errno("calloc");
717 	return error;
718 }
719 
720 static const struct got_error*
721 new_fetch_config(struct fetch_config **fetch_config)
722 {
723 	const struct got_error *error = NULL;
724 
725 	*fetch_config = calloc(1, sizeof(**fetch_config));
726 	if (*fetch_config == NULL)
727 		error = got_error_from_errno("calloc");
728 	return error;
729 }
730 
731 static const struct got_error*
732 new_send_config(struct send_config **send_config)
733 {
734 	const struct got_error *error = NULL;
735 
736 	*send_config = calloc(1, sizeof(**send_config));
737 	if (*send_config == NULL)
738 		error = got_error_from_errno("calloc");
739 	return error;
740 }
741 
742 static void
743 closefile(struct file *file)
744 {
745 	fclose(file->stream);
746 	free(file->ungetbuf);
747 	free(file);
748 }
749 
750 const struct got_error *
751 gotconfig_parse(struct gotconfig **conf, const char *filename, int *fd)
752 {
753 	const struct got_error *err = NULL;
754 	struct sym	*sym, *next;
755 
756 	*conf = NULL;
757 
758 	err = newfile(&file, filename, fd);
759 	if (err)
760 		return err;
761 
762 	TAILQ_INIT(&gotconfig.remotes);
763 
764 	yyparse();
765 	closefile(file);
766 
767 	/* Free macros and check which have not been used. */
768 	TAILQ_FOREACH_SAFE(sym, &symhead, entry, next) {
769 		if (!sym->persist) {
770 			free(sym->nam);
771 			free(sym->val);
772 			TAILQ_REMOVE(&symhead, sym, entry);
773 			free(sym);
774 		}
775 	}
776 
777 	if (gerror == NULL)
778 		*conf = &gotconfig;
779 	return gerror;
780 }
781 
782 static void
783 free_fetch_config(struct fetch_config *fetch_config)
784 {
785 	free(remote->fetch_config->repository);
786 	free(remote->fetch_config->server);
787 	free(remote->fetch_config->protocol);
788 	free(remote->fetch_config);
789 }
790 
791 static void
792 free_send_config(struct send_config *send_config)
793 {
794 	free(remote->send_config->repository);
795 	free(remote->send_config->server);
796 	free(remote->send_config->protocol);
797 	free(remote->send_config);
798 }
799 
800 void
801 gotconfig_free(struct gotconfig *conf)
802 {
803 	struct gotconfig_remote_repo *remote;
804 
805 	free(conf->author);
806 	free(conf->allowed_signers_file);
807 	free(conf->revoked_signers_file);
808 	while (!TAILQ_EMPTY(&conf->remotes)) {
809 		remote = TAILQ_FIRST(&conf->remotes);
810 		TAILQ_REMOVE(&conf->remotes, remote, entry);
811 		if (remote->fetch_config != NULL)
812 			free_fetch_config(remote->fetch_config);
813 		if (remote->send_config != NULL)
814 			free_send_config(remote->send_config);
815 		free(remote->name);
816 		free(remote->repository);
817 		free(remote->server);
818 		free(remote->protocol);
819 		free(remote);
820 	}
821 }
822 
823 int
824 symset(const char *nam, const char *val, int persist)
825 {
826 	struct sym	*sym;
827 
828 	TAILQ_FOREACH(sym, &symhead, entry) {
829 		if (strcmp(nam, sym->nam) == 0)
830 			break;
831 	}
832 
833 	if (sym != NULL) {
834 		if (sym->persist == 1)
835 			return (0);
836 		else {
837 			free(sym->nam);
838 			free(sym->val);
839 			TAILQ_REMOVE(&symhead, sym, entry);
840 			free(sym);
841 		}
842 	}
843 	sym = calloc(1, sizeof(*sym));
844 	if (sym == NULL)
845 		return (-1);
846 
847 	sym->nam = strdup(nam);
848 	if (sym->nam == NULL) {
849 		free(sym);
850 		return (-1);
851 	}
852 	sym->val = strdup(val);
853 	if (sym->val == NULL) {
854 		free(sym->nam);
855 		free(sym);
856 		return (-1);
857 	}
858 	sym->used = 0;
859 	sym->persist = persist;
860 	TAILQ_INSERT_TAIL(&symhead, sym, entry);
861 	return (0);
862 }
863 
864 int
865 cmdline_symset(char *s)
866 {
867 	char	*sym, *val;
868 	int	ret;
869 	size_t	len;
870 
871 	val = strrchr(s, '=');
872 	if (val == NULL)
873 		return (-1);
874 
875 	len = strlen(s) - strlen(val) + 1;
876 	sym = malloc(len);
877 	if (sym == NULL)
878 		errx(1, "cmdline_symset: malloc");
879 
880 	strlcpy(sym, s, len);
881 
882 	ret = symset(sym, val + 1, 1);
883 	free(sym);
884 
885 	return (ret);
886 }
887 
888 char *
889 symget(const char *nam)
890 {
891 	struct sym	*sym;
892 
893 	TAILQ_FOREACH(sym, &symhead, entry) {
894 		if (strcmp(nam, sym->nam) == 0) {
895 			sym->used = 1;
896 			return (sym->val);
897 		}
898 	}
899 	return (NULL);
900 }
901 
902 static int
903 atoul(char *s, u_long *ulvalp)
904 {
905 	u_long	 ulval;
906 	char	*ep;
907 
908 	errno = 0;
909 	ulval = strtoul(s, &ep, 0);
910 	if (s[0] == '\0' || *ep != '\0')
911 		return (-1);
912 	if (errno == ERANGE && ulval == ULONG_MAX)
913 		return (-1);
914 	*ulvalp = ulval;
915 	return (0);
916 }