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      1 /*      $NetBSD: ninebuf.c,v 1.9 2019/10/28 02:59:25 ozaki-r Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2006, 2007  Antti Kantee.  All Rights Reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
     16  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     17  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     18  * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     21  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     25  * SUCH DAMAGE.
     26  */
     27 
     28 #include <sys/cdefs.h>
     29 #ifndef lint
     30 __RCSID("$NetBSD: ninebuf.c,v 1.9 2019/10/28 02:59:25 ozaki-r Exp $");
     31 #endif /* !lint */
     32 
     33 #include <sys/types.h>
     34 #include <sys/time.h>
     35 #include <sys/vnode.h>
     36 #include <sys/socket.h>
     37 
     38 #include <err.h>
     39 #include <errno.h>
     40 #include <stdlib.h>
     41 #include <util.h>
     42 #include <unistd.h>
     43 
     44 #include "ninepuffs.h"
     45 
     46 #define CHECK(v) if (!(v)) abort()
     47 
     48 uint8_t
     49 p9pbuf_get_type(struct puffs_framebuf *pb)
     50 {
     51 	uint8_t val;
     52 
     53 	puffs_framebuf_getdata_atoff(pb, 4, &val, 1);
     54 	return val;
     55 }
     56 
     57 uint16_t
     58 p9pbuf_get_tag(struct puffs_framebuf *pb)
     59 {
     60 	uint16_t val;
     61 
     62 	puffs_framebuf_getdata_atoff(pb, 5, &val, 2);
     63 	return le16toh(val);
     64 }
     65 
     66 static uint32_t
     67 p9pbuf_get_len(struct puffs_framebuf *pb)
     68 {
     69 	uint32_t val;
     70 
     71 	puffs_framebuf_getdata_atoff(pb, 0, &val, 4);
     72 	return le32toh(val);
     73 }
     74 
     75 #define CUROFF(pb) (puffs_framebuf_telloff(pb))
     76 int
     77 p9pbuf_read(struct puffs_usermount *pu, struct puffs_framebuf *pb,
     78 	int fd, int *done)
     79 {
     80 	void *win;
     81 	ssize_t n;
     82 	size_t howmuch, winlen;
     83 	int lenstate;
     84 
     85  the_next_level:
     86 	if ((lenstate = (CUROFF(pb) < 4)))
     87 		howmuch = 4 - CUROFF(pb);
     88 	else
     89 		howmuch = p9pbuf_get_len(pb) - CUROFF(pb);
     90 
     91 	if (puffs_framebuf_reserve_space(pb, howmuch) == -1)
     92 		return errno;
     93 
     94 	while (howmuch) {
     95 		winlen = howmuch;
     96 		if (puffs_framebuf_getwindow(pb, CUROFF(pb), &win, &winlen)==-1)
     97 			return errno;
     98 		n = read(fd, win, winlen);
     99 		switch (n) {
    100 		case 0:
    101 			return ECONNRESET;
    102 		case -1:
    103 			if (errno == EAGAIN)
    104 				return 0;
    105 			return errno;
    106 		default:
    107 			howmuch -= n;
    108 			puffs_framebuf_seekset(pb, CUROFF(pb) + n);
    109 			break;
    110 		}
    111 	}
    112 
    113 	if (!lenstate) {
    114 		puffs_framebuf_seekset(pb, 7);
    115 		*done = 1;
    116 		return 0;
    117 	} else
    118 		goto the_next_level;
    119 }
    120 
    121 int
    122 p9pbuf_write(struct puffs_usermount *pu, struct puffs_framebuf *pb,
    123 	int fd, int *done)
    124 {
    125 	void *win;
    126 	ssize_t n;
    127 	size_t winlen, howmuch;
    128 
    129 	if (CUROFF(pb) == 0) {
    130 		uint32_t len;
    131 
    132 		len = htole32(puffs_framebuf_tellsize(pb));
    133 		puffs_framebuf_putdata_atoff(pb, 0, &len, 4);
    134 	}
    135 
    136 	howmuch = puffs_framebuf_tellsize(pb) - CUROFF(pb);
    137 	while (howmuch) {
    138 		winlen = howmuch;
    139 		if (puffs_framebuf_getwindow(pb, CUROFF(pb), &win, &winlen)==-1)
    140 			return errno;
    141 		n = write(fd, win, winlen);
    142 		switch (n) {
    143 		case 0:
    144 			return ECONNRESET;
    145 		case -1:
    146 			if (errno == EAGAIN)
    147 				return 0;
    148 			return errno;
    149 		default:
    150 			howmuch -= n;
    151 			puffs_framebuf_seekset(pb, CUROFF(pb) + n);
    152 			break;
    153 		}
    154 	}
    155 
    156 	*done = 1;
    157 	return 0;
    158 }
    159 #undef CUROFF
    160 
    161 int
    162 p9pbuf_cmp(struct puffs_usermount *pu,
    163 	struct puffs_framebuf *c1, struct puffs_framebuf *c2, int *notresp)
    164 {
    165 
    166 	return p9pbuf_get_tag(c1) != p9pbuf_get_tag(c2);
    167 }
    168 
    169 struct puffs_framebuf *
    170 p9pbuf_makeout()
    171 {
    172 	struct puffs_framebuf *pb;
    173 
    174 	pb = puffs_framebuf_make();
    175 	puffs_framebuf_seekset(pb, 4);
    176 	return pb;
    177 }
    178 
    179 void
    180 p9pbuf_recycleout(struct puffs_framebuf *pb)
    181 {
    182 
    183 	puffs_framebuf_recycle(pb);
    184 	puffs_framebuf_seekset(pb, 4);
    185 }
    186 
    187 void
    188 p9pbuf_put_1(struct puffs_framebuf *pb, uint8_t val)
    189 {
    190 	int rv;
    191 
    192 	rv = puffs_framebuf_putdata(pb, &val, 1);
    193 	CHECK(rv == 0);
    194 }
    195 
    196 void
    197 p9pbuf_put_2(struct puffs_framebuf *pb, uint16_t val)
    198 {
    199 	int rv;
    200 
    201 	HTOLE16(val);
    202 	rv = puffs_framebuf_putdata(pb, &val, 2);
    203 	CHECK(rv == 0);
    204 }
    205 
    206 void
    207 p9pbuf_put_4(struct puffs_framebuf *pb, uint32_t val)
    208 {
    209 	int rv;
    210 
    211 	HTOLE32(val);
    212 	rv = puffs_framebuf_putdata(pb, &val, 4);
    213 	CHECK(rv == 0);
    214 }
    215 
    216 void
    217 p9pbuf_put_8(struct puffs_framebuf *pb, uint64_t val)
    218 {
    219 	int rv;
    220 
    221 	HTOLE64(val);
    222 	rv = puffs_framebuf_putdata(pb, &val, 8);
    223 	CHECK(rv == 0);
    224 }
    225 
    226 void
    227 p9pbuf_put_data(struct puffs_framebuf *pb, const void *data, uint16_t dlen)
    228 {
    229 	int rv;
    230 
    231 	p9pbuf_put_2(pb, dlen);
    232 	rv = puffs_framebuf_putdata(pb, data, dlen);
    233 	CHECK(rv == 0);
    234 }
    235 
    236 void
    237 p9pbuf_put_str(struct puffs_framebuf *pb, const char *str)
    238 {
    239 
    240 	p9pbuf_put_data(pb, str, strlen(str));
    241 }
    242 
    243 void
    244 p9pbuf_write_data(struct puffs_framebuf *pb, uint8_t *data, uint32_t dlen)
    245 {
    246 	int rv;
    247 
    248 	rv = puffs_framebuf_putdata(pb, data, dlen);
    249 	CHECK(rv == 0);
    250 }
    251 
    252 #define ERETURN(rv) return ((rv) == -1 ? errno : 0)
    253 
    254 int
    255 p9pbuf_get_1(struct puffs_framebuf *pb, uint8_t *val)
    256 {
    257 
    258 	ERETURN(puffs_framebuf_getdata(pb, val, 1));
    259 }
    260 
    261 int
    262 p9pbuf_get_2(struct puffs_framebuf *pb, uint16_t *val)
    263 {
    264 	int rv;
    265 
    266 	rv = puffs_framebuf_getdata(pb, val, 2);
    267 	LE16TOH(*val);
    268 
    269 	ERETURN(rv);
    270 }
    271 
    272 int
    273 p9pbuf_get_4(struct puffs_framebuf *pb, uint32_t *val)
    274 {
    275 	int rv;
    276 
    277 	rv = puffs_framebuf_getdata(pb, val, 4);
    278 	LE32TOH(*val);
    279 
    280 	ERETURN(rv);
    281 }
    282 
    283 int
    284 p9pbuf_get_8(struct puffs_framebuf *pb, uint64_t *val)
    285 {
    286 	int rv;
    287 
    288 	rv = puffs_framebuf_getdata(pb, val, 8);
    289 	LE64TOH(*val);
    290 
    291 	ERETURN(rv);
    292 }
    293 
    294 int
    295 p9pbuf_get_data(struct puffs_framebuf *pb, uint8_t **dp, uint16_t *dlenp)
    296 {
    297         uint8_t *data;
    298 	uint16_t len;
    299 	int rv;
    300 
    301 	rv = p9pbuf_get_2(pb, &len);
    302 	if (rv)
    303 		return errno;
    304 
    305         if (puffs_framebuf_remaining(pb) < len)
    306                 return EPROTO;
    307 
    308 	if (dp) {
    309 		data = emalloc(len+1);
    310 		rv = puffs_framebuf_getdata(pb, data, len);
    311 		if (rv) {
    312 			free(data);
    313 			return errno;
    314 		}
    315 		data[len] = '\0';
    316 		*dp = data;
    317 	} else
    318 		puffs_framebuf_seekset(pb, puffs_framebuf_telloff(pb)+len);
    319 
    320 	if (dlenp)
    321 		*dlenp = len;
    322 
    323 	return 0;
    324 }
    325 
    326 int
    327 p9pbuf_read_data(struct puffs_framebuf *pb, uint8_t *buf, uint32_t dlen)
    328 {
    329 
    330 	ERETURN(puffs_framebuf_getdata(pb, buf, dlen));
    331 }
    332 
    333 int
    334 p9pbuf_get_str(struct puffs_framebuf *pb, char **dp, uint16_t *dlenp)
    335 {
    336 
    337 	return p9pbuf_get_data(pb, (uint8_t **)dp, dlenp);
    338 }
    339