summaryrefslogtreecommitdiff
path: root/lib/libfetch/common.c
blob: 92bfc687c8a83b1758a56b242e74becc45bbfa33 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
/*-
* Copyright (c) 1998-2004 Dag-Erling Coïdan Smørgrav
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer
*    in this position and unchanged.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
*    derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#include <sys/cdefs.h>

#include <sys/param.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/uio.h>
#include <netinet/in.h>

#include <errno.h>
#include <netdb.h>
#include <pwd.h>
#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>

#include "fetch.h"
#include "common.h"


/*** Local data **************************************************************/

/*
* Error messages for resolver errors
*/
static struct fetcherr _netdb_errlist[] = {
#ifdef EAI_NODATA
{ EAI_NODATA,	FETCH_RESOLV,	"Host not found" },
#endif
{ EAI_AGAIN,	FETCH_TEMP,	"Transient resolver failure" },
{ EAI_FAIL,	FETCH_RESOLV,	"Non-recoverable resolver failure" },
{ EAI_NONAME,	FETCH_RESOLV,	"No address record" },
{ -1,		FETCH_UNKNOWN,	"Unknown resolver error" }
};

/* End-of-Line */
static const char ENDL[2] = "\r\n";


/*** Error-reporting functions ***********************************************/

/*
* Map error code to string
*/
static struct fetcherr *
_fetch_finderr(struct fetcherr *p, int e)
{
while (p->num != -1 && p->num != e)
    p++;
return (p);
}

/*
* Set error code
*/
void
_fetch_seterr(struct fetcherr *p, int e)
{
p = _fetch_finderr(p, e);
fetchLastErrCode = p->cat;
snprintf(fetchLastErrString, MAXERRSTRING, "%s", p->string);
}

/*
* Set error code according to errno
*/
void
_fetch_syserr(void)
{
switch (errno) {
case 0:
    fetchLastErrCode = FETCH_OK;
    break;
case EPERM:
case EACCES:
case EROFS:
    fetchLastErrCode = FETCH_AUTH;
    break;
case ENOENT:
case EISDIR: /* XXX */
    fetchLastErrCode = FETCH_UNAVAIL;
    break;
case ENOMEM:
    fetchLastErrCode = FETCH_MEMORY;
    break;
case EBUSY:
case EAGAIN:
    fetchLastErrCode = FETCH_TEMP;
    break;
case EEXIST:
    fetchLastErrCode = FETCH_EXISTS;
    break;
case ENOSPC:
    fetchLastErrCode = FETCH_FULL;
    break;
case EADDRINUSE:
case EADDRNOTAVAIL:
case ENETDOWN:
case ENETUNREACH:
case ENETRESET:
case EHOSTUNREACH:
    fetchLastErrCode = FETCH_NETWORK;
    break;
case ECONNABORTED:
case ECONNRESET:
    fetchLastErrCode = FETCH_ABORT;
    break;
case ETIMEDOUT:
    fetchLastErrCode = FETCH_TIMEOUT;
    break;
case ECONNREFUSED:
case EHOSTDOWN:
    fetchLastErrCode = FETCH_DOWN;
    break;
default:
    fetchLastErrCode = FETCH_UNKNOWN;
}
snprintf(fetchLastErrString, MAXERRSTRING, "%s", strerror(errno));
}


/*
* Emit status message
*/
void
_fetch_info(const char *fmt, ...)
{
va_list ap;

va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
fputc('\n', stderr);
}


/*** Network-related utility functions ***************************************/

/*
* Return the default port for a scheme
*/
int
_fetch_default_port(const char *scheme)
{
struct servent *se;

if ((se = getservbyname(scheme, "tcp")) != NULL)
    return (ntohs(se->s_port));
if (strcasecmp(scheme, SCHEME_FTP) == 0)
    return (FTP_DEFAULT_PORT);
if (strcasecmp(scheme, SCHEME_HTTP) == 0)
    return (HTTP_DEFAULT_PORT);
return (0);
}

/*
* Return the default proxy port for a scheme
*/
int
_fetch_default_proxy_port(const char *scheme)
{
if (strcasecmp(scheme, SCHEME_FTP) == 0)
    return (FTP_DEFAULT_PROXY_PORT);
if (strcasecmp(scheme, SCHEME_HTTP) == 0)
    return (HTTP_DEFAULT_PROXY_PORT);
return (0);
}


/*
* Create a connection for an existing descriptor.
*/
conn_t *
_fetch_reopen(int sd)
{
conn_t *conn;

/* allocate and fill connection structure */
if ((conn = calloc(1, sizeof(*conn))) == NULL)
    return (NULL);
conn->sd = sd;
++conn->ref;
return (conn);
}


/*
* Bump a connection's reference count.
*/
conn_t *
_fetch_ref(conn_t *conn)
{

++conn->ref;
return (conn);
}


/*
* Bind a socket to a specific local address
*/
int
_fetch_bind(int sd, int af, const char *addr)
{
struct addrinfo hints, *res, *res0;
int err;

memset(&hints, 0, sizeof(hints));
hints.ai_family = af;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = 0;
if ((err = getaddrinfo(addr, NULL, &hints, &res0)) != 0)
    return (-1);
for (res = res0; res; res = res->ai_next)
    if (bind(sd, res->ai_addr, res->ai_addrlen) == 0)
        return (0);
return (-1);
}


/*
* Establish a TCP connection to the specified port on the specified host.
*/
conn_t *
_fetch_connect(const char *host, int port, int af, int verbose)
{
conn_t *conn;
char pbuf[10];
const char *bindaddr;
struct addrinfo hints, *res, *res0;
int sd, err;

DEBUG(fprintf(stderr, "---> %s:%d\n", host, port));

if (verbose)
    _fetch_info("looking up %s", host);

/* look up host name and set up socket address structure */
snprintf(pbuf, sizeof(pbuf), "%d", port);
memset(&hints, 0, sizeof(hints));
hints.ai_family = af;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = 0;
if ((err = getaddrinfo(host, pbuf, &hints, &res0)) != 0) {
    _netdb_seterr(err);
    return (NULL);
}
bindaddr = getenv("FETCH_BIND_ADDRESS");

if (verbose)
    _fetch_info("connecting to %s:%d", host, port);

/* try to connect */
for (sd = -1, res = res0; res; sd = -1, res = res->ai_next) {
    if ((sd = socket(res->ai_family, res->ai_socktype,
         res->ai_protocol)) == -1)
        continue;
    if (bindaddr != NULL && *bindaddr != '\0' &&
        _fetch_bind(sd, res->ai_family, bindaddr) != 0) {
        _fetch_info("failed to bind to '%s'", bindaddr);
        close(sd);
        continue;
    }
    if (connect(sd, res->ai_addr, res->ai_addrlen) == 0)
        break;
    close(sd);
}
freeaddrinfo(res0);
if (sd == -1) {
    _fetch_syserr();
    return (NULL);
}

if ((conn = _fetch_reopen(sd)) == NULL) {
    _fetch_syserr();
    close(sd);
}
return (conn);
}


/*
* Enable SSL on a connection.
*/
int
_fetch_ssl(conn_t *conn, int verbose)
{

#ifdef WITH_SSL
/* Init the SSL library and context */
if (!SSL_library_init()){
    fprintf(stderr, "SSL library init failed\n");
    return (-1);
}

SSL_load_error_strings();

conn->ssl_meth = SSLv23_client_method();
conn->ssl_ctx = SSL_CTX_new(conn->ssl_meth);
SSL_CTX_set_mode(conn->ssl_ctx, SSL_MODE_AUTO_RETRY);

conn->ssl = SSL_new(conn->ssl_ctx);
if (conn->ssl == NULL){
    fprintf(stderr, "SSL context creation failed\n");
    return (-1);
}
SSL_set_fd(conn->ssl, conn->sd);
if (SSL_connect(conn->ssl) == -1){
    ERR_print_errors_fp(stderr);
    return (-1);
}

if (verbose) {
    X509_NAME *name;
    char *str;

    fprintf(stderr, "SSL connection established using %s\n",
        SSL_get_cipher(conn->ssl));
    conn->ssl_cert = SSL_get_peer_certificate(conn->ssl);
    name = X509_get_subject_name(conn->ssl_cert);
    str = X509_NAME_oneline(name, 0, 0);
    printf("Certificate subject: %s\n", str);
    free(str);
    name = X509_get_issuer_name(conn->ssl_cert);
    str = X509_NAME_oneline(name, 0, 0);
    printf("Certificate issuer: %s\n", str);
    free(str);
}

return (0);
#else
(void)conn;
(void)verbose;
fprintf(stderr, "SSL support disabled\n");
return (-1);
#endif
}


/*
* Read a character from a connection w/ timeout
*/
ssize_t
_fetch_read(conn_t *conn, char *buf, size_t len)
{
struct timeval wait;
fd_set readfds;
ssize_t rlen, total;
int r;

if (fetchTimeout) {
    FD_ZERO(&readfds);
    /*
    gettimeofday(&timeout, NULL);
    timeout.tv_sec += fetchTimeout;
    */
}

total = 0;
while (len > 0) {
    while (fetchTimeout && !FD_ISSET(conn->sd, &readfds)) {
        FD_SET(conn->sd, &readfds);
        /*gettimeofday(&now, NULL);
        wait.tv_sec = timeout.tv_sec - now.tv_sec;
        wait.tv_usec = timeout.tv_usec - now.tv_usec;
        if (wait.tv_usec < 0) {
            wait.tv_usec += 1000000;
            wait.tv_sec--;
        }
        if (wait.tv_sec < 0) {
            errno = ETIMEDOUT;
            _fetch_syserr();
            return (-1);
        }
        */
        wait.tv_sec = fetchTimeout / 1000;
        wait.tv_usec = (fetchTimeout % 1000) * 1000;
        errno = 0;
        r = select(conn->sd + 1, &readfds, NULL, NULL, &wait);
        if (r == -1) {
            if (errno == EINTR && fetchRestartCalls)
                continue;
            _fetch_syserr();
            return (-1);
        } else if (r == 0) {
            errno = ETIMEDOUT;
            _fetch_syserr();
            return (-1);
        }
    }
#ifdef WITH_SSL
    if (conn->ssl != NULL)
        rlen = SSL_read(conn->ssl, buf, len);
    else
#endif
        rlen = read(conn->sd, buf, len);
    if (rlen == 0)
        break;
    if (rlen < 0) {
        if (errno == EINTR && fetchRestartCalls)
            continue;
        return (-1);
    }
    len -= rlen;
    buf += rlen;
    total += rlen;
}
return (total);
}


/*
* Read a line of text from a connection w/ timeout
*/
#define MIN_BUF_SIZE 1024

int
_fetch_getln(conn_t *conn)
{
    char *tmp;
    size_t tmpsize;
    ssize_t len;
    char c;

    if (conn->buf == NULL) {
        if ((conn->buf = malloc(MIN_BUF_SIZE)) == NULL) {
            errno = ENOMEM;
            return (-1);
        }
        conn->bufsize = MIN_BUF_SIZE;
    }

    conn->buf[0] = '\0';
    conn->buflen = 0;

    do {
        len = _fetch_read(conn, &c, 1);
        if (len == -1)
            return (-1);
        if (len == 0)
            break;
        conn->buf[conn->buflen++] = c;
        if (conn->buflen == conn->bufsize) {
            tmp = conn->buf;
            tmpsize = conn->bufsize * 2 + 1;
            if ((tmp = realloc(tmp, tmpsize)) == NULL) {
                errno = ENOMEM;
                return (-1);
            }
            conn->buf = tmp;
            conn->bufsize = tmpsize;
        }
    } while (c != '\n');

    conn->buf[conn->buflen] = '\0';
    DEBUG(fprintf(stderr, "<<< %s", conn->buf));
    return (0);
}


/*
 * Write to a connection w/ timeout
 */
ssize_t
_fetch_write(conn_t *conn, const char *buf, size_t len)
{
	struct iovec iov;

	iov.iov_base = __DECONST(char *, buf);
	iov.iov_len = len;
	return _fetch_writev(conn, &iov, 1);
}

/*
 * Write a vector to a connection w/ timeout
 * Note: can modify the iovec.
 */
ssize_t
_fetch_writev(conn_t *conn, struct iovec *iov, int iovcnt)
{
	struct timeval wait;
	fd_set writefds;
	ssize_t wlen, total;
	int r;

	if (fetchTimeout) {
		FD_ZERO(&writefds);
        /*
		gettimeofday(&timeout, NULL);
		timeout.tv_sec += fetchTimeout;
        */
	}

	total = 0;
	while (iovcnt > 0) {
		while (fetchTimeout && !FD_ISSET(conn->sd, &writefds)) {
			FD_SET(conn->sd, &writefds);
            /*
			gettimeofday(&now, NULL);
			wait.tv_sec = timeout.tv_sec - now.tv_sec;
			wait.tv_usec = timeout.tv_usec - now.tv_usec;
			if (wait.tv_usec < 0) {
				wait.tv_usec += 1000000;
				wait.tv_sec--;
			}
			if (wait.tv_sec < 0) {
				errno = ETIMEDOUT;
				_fetch_syserr();
				return (-1);
			}
            */
            wait.tv_sec = fetchTimeout / 1000;
            wait.tv_usec = (fetchTimeout % 1000) * 1000;
			errno = 0;
			r = select(conn->sd + 1, NULL, &writefds, NULL, &wait);
			if (r == -1) {
				if (errno == EINTR && fetchRestartCalls)
					continue;
				return (-1);
			} else if (r == 0) {
                errno = ETIMEDOUT;
				_fetch_syserr();
				return (-1);
            }
		}
		errno = 0;
#ifdef WITH_SSL
		if (conn->ssl != NULL)
			wlen = SSL_write(conn->ssl,
			    iov->iov_base, iov->iov_len);
		else
#endif
			wlen = writev(conn->sd, iov, iovcnt);
		if (wlen == 0) {
			/* we consider a short write a failure */
			errno = EPIPE;
			_fetch_syserr();
			return (-1);
		}
		if (wlen < 0) {
			if (errno == EINTR && fetchRestartCalls)
				continue;
			return (-1);
		}
		total += wlen;
		while (iovcnt > 0 && wlen >= (ssize_t)iov->iov_len) {
			wlen -= iov->iov_len;
			iov++;
			iovcnt--;
		}
		if (iovcnt > 0) {
			iov->iov_len -= wlen;
			iov->iov_base = __DECONST(char *, iov->iov_base) + wlen;
		}
	}
	return (total);
}


/*
 * Write a line of text to a connection w/ timeout
 */
int
_fetch_putln(conn_t *conn, const char *str, size_t len)
{
	struct iovec iov[2];
	int ret;

	DEBUG(fprintf(stderr, ">>> %s\n", str));
	iov[0].iov_base = __DECONST(char *, str);
	iov[0].iov_len = len;
	iov[1].iov_base = __DECONST(char *, ENDL);
	iov[1].iov_len = sizeof(ENDL);
	if (len == 0)
		ret = _fetch_writev(conn, &iov[1], 1);
	else
		ret = _fetch_writev(conn, iov, 2);
	if (ret == -1)
		return (-1);
	return (0);
}


/*
 * Close connection
 */
int
_fetch_close(conn_t *conn)
{
	int ret;

	if (--conn->ref > 0)
		return (0);
	ret = close(conn->sd);
	free(conn->buf);
	free(conn);
	return (ret);
}


/*** Directory-related utility functions *************************************/

int
_fetch_add_entry(struct url_ent **p, int *size, int *len,
    const char *name, struct url_stat *us)
{
	struct url_ent *tmp;

	if (*p == NULL) {
		*size = 0;
		*len = 0;
	}

	if (*len >= *size - 1) {
		tmp = realloc(*p, (*size * 2 + 1) * sizeof(**p));
		if (tmp == NULL) {
			errno = ENOMEM;
			_fetch_syserr();
			return (-1);
		}
		*size = (*size * 2 + 1);
		*p = tmp;
	}

	tmp = *p + *len;
	snprintf(tmp->name, PATH_MAX, "%s", name);
	bcopy(us, &tmp->stat, sizeof(*us));

	(*len)++;
	(++tmp)->name[0] = 0;

	return (0);
}


/*** Authentication-related utility functions ********************************/

static const char *
_fetch_read_word(FILE *f)
{
	static char word[1024];

	if (fscanf(f, " %1024s ", word) != 1)
		return (NULL);
	return (word);
}

/*
 * Get authentication data for a URL from .netrc
 */
int
_fetch_netrc_auth(struct url *url)
{
	char fn[PATH_MAX];
	const char *word;
	char *p;
	FILE *f;

	if ((p = getenv("NETRC")) != NULL) {
		if (snprintf(fn, sizeof(fn), "%s", p) >= (int)sizeof(fn)) {
			_fetch_info("$NETRC specifies a file name "
			    "longer than PATH_MAX");
			return (-1);
		}
	} else {
		if ((p = getenv("HOME")) != NULL) {
			struct passwd *pwd;

			if ((pwd = getpwuid(getuid())) == NULL ||
			    (p = pwd->pw_dir) == NULL)
				return (-1);
		}
		if (snprintf(fn, sizeof(fn), "%s/.netrc", p) >= (int)sizeof(fn))
			return (-1);
	}

	if ((f = fopen(fn, "r")) == NULL)
		return (-1);
	while ((word = _fetch_read_word(f)) != NULL) {
		if (strcmp(word, "default") == 0) {
			DEBUG(_fetch_info("Using default .netrc settings"));
			break;
		}
		if (strcmp(word, "machine") == 0 &&
		    (word = _fetch_read_word(f)) != NULL &&
		    strcasecmp(word, url->host) == 0) {
			DEBUG(_fetch_info("Using .netrc settings for %s", word));
			break;
		}
	}
	if (word == NULL)
		goto ferr;
	while ((word = _fetch_read_word(f)) != NULL) {
		if (strcmp(word, "login") == 0) {
			if ((word = _fetch_read_word(f)) == NULL)
				goto ferr;
			if (snprintf(url->user, sizeof(url->user),
				"%s", word) > (int)sizeof(url->user)) {
				_fetch_info("login name in .netrc is too long");
				url->user[0] = '\0';
			}
		} else if (strcmp(word, "password") == 0) {
			if ((word = _fetch_read_word(f)) == NULL)
				goto ferr;
			if (snprintf(url->pwd, sizeof(url->pwd),
				"%s", word) > (int)sizeof(url->pwd)) {
				_fetch_info("password in .netrc is too long");
				url->pwd[0] = '\0';
			}
		} else if (strcmp(word, "account") == 0) {
			if ((word = _fetch_read_word(f)) == NULL)
				goto ferr;
			/* XXX not supported! */
		} else {
			break;
		}
	}
	fclose(f);
	return (0);
 ferr:
	fclose(f);
	return (-1);
}