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Date:: Tue Dec 14 09:22:49 2021 UTC
Message:: split some code from kamirepl into 9pclib.c
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  1 4e83b30f 2021-12-14 op /*
  2 4e83b30f 2021-12-14 op  * Copyright (c) 2021 Omar Polo <op@omarpolo.com>
  3 4e83b30f 2021-12-14 op  *
  4 4e83b30f 2021-12-14 op  * Permission to use, copy, modify, and distribute this software for any
  5 4e83b30f 2021-12-14 op  * purpose with or without fee is hereby granted, provided that the above
  6 4e83b30f 2021-12-14 op  * copyright notice and this permission notice appear in all copies.
  7 4e83b30f 2021-12-14 op  *
  8 4e83b30f 2021-12-14 op  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  9 4e83b30f 2021-12-14 op  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 10 4e83b30f 2021-12-14 op  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 11 4e83b30f 2021-12-14 op  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 12 4e83b30f 2021-12-14 op  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 13 4e83b30f 2021-12-14 op  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 14 4e83b30f 2021-12-14 op  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 15 4e83b30f 2021-12-14 op  */
 16 4e83b30f 2021-12-14 op 
 17 4e83b30f 2021-12-14 op #include "compat.h"
 18 4e83b30f 2021-12-14 op 
 19 4e83b30f 2021-12-14 op #include <endian.h>
 20 4e83b30f 2021-12-14 op #include <inttypes.h>
 21 4e83b30f 2021-12-14 op #include <string.h>
 22 4e83b30f 2021-12-14 op 
 23 4e83b30f 2021-12-14 op #include "9pclib.h"
 24 4e83b30f 2021-12-14 op #include "kamid.h"
 25 4e83b30f 2021-12-14 op #include "log.h"
 26 4e83b30f 2021-12-14 op #include "utils.h"
 27 4e83b30f 2021-12-14 op 
 28 4e83b30f 2021-12-14 op uint16_t iota_tag;
 29 4e83b30f 2021-12-14 op 
 30 4e83b30f 2021-12-14 op struct evbuffer *evb;
 31 4e83b30f 2021-12-14 op 
 32 4e83b30f 2021-12-14 op void
 33 4e83b30f 2021-12-14 op write_hdr(uint32_t len, uint8_t type, uint16_t tag)
 34 4e83b30f 2021-12-14 op {
 35 4e83b30f 2021-12-14 op 	len += HEADERSIZE;
 36 4e83b30f 2021-12-14 op 
 37 4e83b30f 2021-12-14 op 	log_debug("enqueuing a packet; len=%"PRIu32" type=%d[%s] tag=%d",
 38 4e83b30f 2021-12-14 op 	    len, type, pp_msg_type(type), tag);
 39 4e83b30f 2021-12-14 op 
 40 4e83b30f 2021-12-14 op 	len = htole32(len);
 41 4e83b30f 2021-12-14 op 	/* type is one byte, no endiannes issues */
 42 4e83b30f 2021-12-14 op 	tag = htole16(tag);
 43 4e83b30f 2021-12-14 op 		
 44 4e83b30f 2021-12-14 op 	evbuffer_add(evb, &len, sizeof(len));
 45 4e83b30f 2021-12-14 op 	evbuffer_add(evb, &type, sizeof(type));
 46 4e83b30f 2021-12-14 op 	evbuffer_add(evb, &tag, sizeof(tag));
 47 4e83b30f 2021-12-14 op }
 48 4e83b30f 2021-12-14 op 
 49 4e83b30f 2021-12-14 op void
 50 4e83b30f 2021-12-14 op write_hdr_auto(uint32_t len, uint8_t type)
 51 4e83b30f 2021-12-14 op {
 52 4e83b30f 2021-12-14 op 	if (++iota_tag == NOTAG)
 53 4e83b30f 2021-12-14 op 		++iota_tag;
 54 4e83b30f 2021-12-14 op 	write_hdr(len, type, iota_tag);
 55 4e83b30f 2021-12-14 op }
 56 4e83b30f 2021-12-14 op 
 57 4e83b30f 2021-12-14 op void
 58 4e83b30f 2021-12-14 op write_str(uint16_t len, const char *str)
 59 4e83b30f 2021-12-14 op {
 60 4e83b30f 2021-12-14 op 	uint16_t l = len;
 61 4e83b30f 2021-12-14 op 
 62 4e83b30f 2021-12-14 op 	len = htole16(len);
 63 4e83b30f 2021-12-14 op 	evbuffer_add(evb, &len, sizeof(len));
 64 4e83b30f 2021-12-14 op 	evbuffer_add(evb, str, l);
 65 4e83b30f 2021-12-14 op }
 66 4e83b30f 2021-12-14 op 
 67 4e83b30f 2021-12-14 op void
 68 4e83b30f 2021-12-14 op write_str_auto(const char *str)
 69 4e83b30f 2021-12-14 op {
 70 4e83b30f 2021-12-14 op 	write_str(strlen(str), str);
 71 4e83b30f 2021-12-14 op }
 72 4e83b30f 2021-12-14 op 
 73 4e83b30f 2021-12-14 op void
 74 4e83b30f 2021-12-14 op write_32(uint32_t fid)
 75 4e83b30f 2021-12-14 op {
 76 4e83b30f 2021-12-14 op 	fid = htole32(fid);
 77 4e83b30f 2021-12-14 op 	evbuffer_add(evb, &fid, sizeof(fid));
 78 4e83b30f 2021-12-14 op }
 79 4e83b30f 2021-12-14 op 
 80 4e83b30f 2021-12-14 op void
 81 4e83b30f 2021-12-14 op write_16(uint16_t tag)
 82 4e83b30f 2021-12-14 op {
 83 4e83b30f 2021-12-14 op 	tag = htole16(tag);
 84 4e83b30f 2021-12-14 op 	evbuffer_add(evb, &tag, sizeof(tag));
 85 4e83b30f 2021-12-14 op }
 86 4e83b30f 2021-12-14 op 
 87 4e83b30f 2021-12-14 op 
 88 4e83b30f 2021-12-14 op 
 89 4e83b30f 2021-12-14 op void
 90 4e83b30f 2021-12-14 op tversion(const char *v, uint32_t msize)
 91 4e83b30f 2021-12-14 op {
 92 4e83b30f 2021-12-14 op 	uint32_t	len;
 93 4e83b30f 2021-12-14 op 	uint16_t	sl;
 94 4e83b30f 2021-12-14 op 
 95 4e83b30f 2021-12-14 op 	sl = strlen(v);
 96 4e83b30f 2021-12-14 op 
 97 4e83b30f 2021-12-14 op 	/* msize[4] version[s] */
 98 4e83b30f 2021-12-14 op 	len = sizeof(msize) + sizeof(sl) + sl;
 99 4e83b30f 2021-12-14 op 	write_hdr(len, Tversion, NOTAG);
100 4e83b30f 2021-12-14 op 	write_32(msize);
101 4e83b30f 2021-12-14 op 	write_str(sl, v);
102 4e83b30f 2021-12-14 op }
103 4e83b30f 2021-12-14 op 
104 4e83b30f 2021-12-14 op void
105 4e83b30f 2021-12-14 op tattach(uint32_t fid, uint32_t afid, const char *uname, const char *aname)
106 4e83b30f 2021-12-14 op {
107 4e83b30f 2021-12-14 op 	uint32_t	len;
108 4e83b30f 2021-12-14 op 	uint16_t	ul, al;
109 4e83b30f 2021-12-14 op 
110 4e83b30f 2021-12-14 op 	ul = strlen(uname);
111 4e83b30f 2021-12-14 op 	al = strlen(aname);
112 4e83b30f 2021-12-14 op 
113 4e83b30f 2021-12-14 op 	/* fid[4] afid[4] uname[s] aname[s] */
114 4e83b30f 2021-12-14 op 	len = sizeof(fid) + sizeof(afid) + sizeof(ul) + ul
115 4e83b30f 2021-12-14 op 	    + sizeof(al) + al;
116 4e83b30f 2021-12-14 op 	write_hdr_auto(len, Tattach);
117 4e83b30f 2021-12-14 op 	write_fid(fid);
118 4e83b30f 2021-12-14 op 	write_fid(NOFID);
119 4e83b30f 2021-12-14 op 	write_str(ul, uname);
120 4e83b30f 2021-12-14 op 	write_str(al, aname);
121 4e83b30f 2021-12-14 op }
122 4e83b30f 2021-12-14 op 
123 4e83b30f 2021-12-14 op void
124 4e83b30f 2021-12-14 op tclunk(uint32_t fid)
125 4e83b30f 2021-12-14 op {
126 4e83b30f 2021-12-14 op 	uint32_t	len;
127 4e83b30f 2021-12-14 op 
128 4e83b30f 2021-12-14 op 	/* fid[4] */
129 4e83b30f 2021-12-14 op 	len = sizeof(fid);
130 4e83b30f 2021-12-14 op 	write_hdr_auto(len, Tclunk);
131 4e83b30f 2021-12-14 op 	write_fid(fid);
132 4e83b30f 2021-12-14 op }
133 4e83b30f 2021-12-14 op 
134 4e83b30f 2021-12-14 op void
135 4e83b30f 2021-12-14 op tflush(uint16_t oldtag)
136 4e83b30f 2021-12-14 op {
137 4e83b30f 2021-12-14 op 	uint32_t	len;
138 4e83b30f 2021-12-14 op 
139 4e83b30f 2021-12-14 op 	/* oldtag[2] */
140 4e83b30f 2021-12-14 op 	len = sizeof(oldtag);
141 4e83b30f 2021-12-14 op 	write_hdr_auto(len, Tflush);
142 4e83b30f 2021-12-14 op 	write_tag(oldtag);
143 4e83b30f 2021-12-14 op }
144 4e83b30f 2021-12-14 op 
145 4e83b30f 2021-12-14 op void
146 4e83b30f 2021-12-14 op twalk(uint32_t fid, uint32_t newfid, const char **wnames, size_t nwname)
147 4e83b30f 2021-12-14 op {
148 4e83b30f 2021-12-14 op 	size_t		i;
149 4e83b30f 2021-12-14 op 	uint32_t	len;
150 4e83b30f 2021-12-14 op 
151 4e83b30f 2021-12-14 op 	/* fid[4] newfid[4] nwname[2] nwname*(wname[s]) */
152 4e83b30f 2021-12-14 op 	len = sizeof(fid) + sizeof(newfid) + 2;
153 4e83b30f 2021-12-14 op 	for (i = 0; i < nwname; ++i)
154 4e83b30f 2021-12-14 op 		len += 2 + strlen(wnames[i]);
155 4e83b30f 2021-12-14 op 
156 4e83b30f 2021-12-14 op 	write_hdr_auto(len, Twalk);
157 4e83b30f 2021-12-14 op 	write_fid(fid);
158 4e83b30f 2021-12-14 op 	write_fid(newfid);
159 4e83b30f 2021-12-14 op 	write_16(nwname);
160 4e83b30f 2021-12-14 op 	for (i = 0; i < nwname; ++i)
161 4e83b30f 2021-12-14 op 		write_str_auto(wnames[i]);
162 4e83b30f 2021-12-14 op }