Bug Summary

File:tvlserver/./../util/hostparse.c
Location:line 56, column 2
Description:Value stored to 'tc' is never read

Annotated Source Code

1/*
2 * Copyright 2000, International Business Machines Corporation and others.
3 * All Rights Reserved.
4 *
5 * This software has been released under the terms of the IBM Public
6 * License. For details, see the LICENSE file in the top-level source
7 * directory or online at http://www.openafs.org/dl/license10.html
8 */
9
10/*
11 * ALL RIGHTS RESERVED
12 */
13
14#include <afsconfig.h>
15#include <afs/param.h>
16
17#include <roken.h>
18
19#ifdef AFS_NT40_ENV
20#include <direct.h>
21#else
22#include <ctype.h>
23#endif
24
25#include "afsutil.h"
26
27/* also parse a.b.c.d addresses */
28struct hostent *
29hostutil_GetHostByName(char *ahost)
30{
31 int tc;
32 static struct hostent thostent;
33 static char *addrp[2];
34 static char addr[4];
35 char *ptr = ahost;
36 afs_uint32 tval, numeric = 0;
37 int dots = 0;
38
39 tc = *ahost; /* look at the first char */
40 if (tc >= '0' && tc <= '9') {
41 numeric = 1;
42 while ((tc = *ptr++)) {
43 if (tc == '.') {
44 if (dots >= 3) {
45 numeric = 0;
46 break;
47 }
48 dots++;
49 } else if (tc > '9' || tc < '0') {
50 numeric = 0;
51 break;
52 }
53 }
54 }
55 if (numeric) {
56 tc = *ahost; /* look at the first char */
Value stored to 'tc' is never read
57 /* decimal address, return fake hostent with only hostaddr field good */
58 tval = 0;
59 dots = 0;
60 memset(addr, 0, sizeof(addr));
61 while ((tc = *ahost++)) {
62 if (tc == '.') {
63 if (dots >= 3)
64 return NULL((void *)0); /* too many dots */
65 addr[dots++] = tval;
66 tval = 0;
67 } else if (tc > '9' || tc < '0')
68 return NULL((void *)0);
69 else {
70 tval *= 10;
71 tval += tc - '0';
72 }
73 }
74 addr[dots] = tval;
75#ifdef h_addrh_addr_list[0]
76 /* 4.3 system */
77 addrp[0] = addr;
78 addrp[1] = NULL((void *)0);
79 thostent.h_addr_list = &addrp[0];
80#else /* h_addr */
81 /* 4.2 and older systems */
82 thostent.h_addrh_addr_list[0] = addr;
83#endif /* h_addr */
84 return &thostent;
85 } else {
86#ifdef AFS_NT40_ENV
87 if (afs_winsockInit() < 0)
88 return NULL((void *)0);
89#endif
90 return gethostbyname(ahost);
91 }
92}
93
94/* Translate an internet address into a nice printable string. The
95 * variable addr is in network byte order.
96 */
97char *
98hostutil_GetNameByINet(afs_uint32 addr)
99{
100 struct hostent *th;
101 static char tbuffer[256];
102
103#ifdef AFS_NT40_ENV
104 if (afs_winsockInit() < 0)
105 return NULL((void *)0);
106#endif
107 th = gethostbyaddr((void *)&addr, sizeof(addr), AF_INET2);
108 if (th) {
109 strcpy(tbuffer, th->h_name);
110 } else {
111 addr = ntohl(addr)(__builtin_constant_p(addr) ? ((((__uint32_t)(addr)) >>
24) | ((((__uint32_t)(addr)) & (0xff << 16)) >>
8) | ((((__uint32_t)(addr)) & (0xff << 8)) <<
8) | (((__uint32_t)(addr)) << 24)) : __bswap32_var(addr
));
112 sprintf(tbuffer, "%d.%d.%d.%d", (int)((addr >> 24) & 0xff),
113 (int)((addr >> 16) & 0xff), (int)((addr >> 8) & 0xff),
114 (int)(addr & 0xff));
115 }
116
117 return tbuffer;
118}
119
120/* the parameter is a pointer to a buffer containing a string of
121** bytes of the form
122** w.x.y.z # machineName
123** returns the network interface in network byte order
124*/
125afs_uint32
126extractAddr(char *line, int maxSize)
127{
128 char byte1[32], byte2[32], byte3[32], byte4[32];
129 int i = 0;
130 char *endPtr;
131 afs_uint32 val1, val2, val3, val4;
132 afs_uint32 val = 0;
133
134 /* skip empty spaces */
135 while (isspace(*line)__sbistype((*line), 0x00004000L) && maxSize) {
136 line++;
137 maxSize--;
138 }
139
140 /* skip empty lines */
141 if (!maxSize || !*line)
142 return AFS_IPINVALIDIGNORE0xfffffffe;
143
144 while ((*line != '.') && maxSize) { /* extract first byte */
145 if (!isdigit(*line)__isctype((*line), 0x00000400L))
146 return AFS_IPINVALID0xffffffff;
147 if (i > 31)
148 return AFS_IPINVALID0xffffffff; /* no space */
149 byte1[i++] = *line++;
150 maxSize--;
151 }
152 if (!maxSize)
153 return AFS_IPINVALID0xffffffff;
154 byte1[i] = 0;
155
156 i = 0, line++;
157 while ((*line != '.') && maxSize) { /* extract second byte */
158 if (!isdigit(*line)__isctype((*line), 0x00000400L))
159 return AFS_IPINVALID0xffffffff;
160 if (i > 31)
161 return AFS_IPINVALID0xffffffff; /* no space */
162 byte2[i++] = *line++;
163 maxSize--;
164 }
165 if (!maxSize)
166 return AFS_IPINVALID0xffffffff;
167 byte2[i] = 0;
168
169 i = 0, line++;
170 while ((*line != '.') && maxSize) {
171 if (!isdigit(*line)__isctype((*line), 0x00000400L))
172 return AFS_IPINVALID0xffffffff;
173 if (i > 31)
174 return AFS_IPINVALID0xffffffff; /* no space */
175 byte3[i++] = *line++;
176 maxSize--;
177 }
178 if (!maxSize)
179 return AFS_IPINVALID0xffffffff;
180 byte3[i] = 0;
181
182 i = 0, line++;
183 while (*line && !isspace(*line)__sbistype((*line), 0x00004000L) && maxSize) {
184 if (!isdigit(*line)__isctype((*line), 0x00000400L))
185 return AFS_IPINVALID0xffffffff;
186 if (i > 31)
187 return AFS_IPINVALID0xffffffff; /* no space */
188 byte4[i++] = *line++;
189 maxSize--;
190 }
191 if (!maxSize)
192 return AFS_IPINVALID0xffffffff;
193 byte4[i] = 0;
194
195 errno(* __error()) = 0;
196 val1 = strtol(byte1, &endPtr, 10);
197 if ((val1 == 0) && (errno(* __error()) != 0 || byte1 == endPtr))
198 return AFS_IPINVALID0xffffffff;
199
200 errno(* __error()) = 0;
201 val2 = strtol(byte2, &endPtr, 10);
202 if ((val2 == 0) && (errno(* __error()) != 0 || byte2 == endPtr)) /* no conversion */
203 return AFS_IPINVALID0xffffffff;
204
205 errno(* __error()) = 0;
206 val3 = strtol(byte3, &endPtr, 10);
207 if ((val3 == 0) && (errno(* __error()) != 0 || byte3 == endPtr)) /* no conversion */
208 return AFS_IPINVALID0xffffffff;
209
210 errno(* __error()) = 0;
211 val4 = strtol(byte4, &endPtr, 10);
212 if ((val4 == 0) && (errno(* __error()) != 0 || byte4 == endPtr)) /* no conversion */
213 return AFS_IPINVALID0xffffffff;
214
215 val = (val1 << 24) | (val2 << 16) | (val3 << 8) | val4;
216 val = htonl(val)(__builtin_constant_p(val) ? ((((__uint32_t)(val)) >> 24
) | ((((__uint32_t)(val)) & (0xff << 16)) >> 8
) | ((((__uint32_t)(val)) & (0xff << 8)) << 8
) | (((__uint32_t)(val)) << 24)) : __bswap32_var(val));
217 return val;
218}
219
220/* same as inet_ntoa, but to a non-static buffer, must be freed by called */
221char *
222afs_inet_ntoa_r(afs_uint32 addr, char *buf)
223{
224 int temp;
225
226 temp = ntohl(addr)(__builtin_constant_p(addr) ? ((((__uint32_t)(addr)) >>
24) | ((((__uint32_t)(addr)) & (0xff << 16)) >>
8) | ((((__uint32_t)(addr)) & (0xff << 8)) <<
8) | (((__uint32_t)(addr)) << 24)) : __bswap32_var(addr
));
227 sprintf(buf, "%d.%d.%d.%d", (temp >> 24) & 0xff, (temp >> 16) & 0xff,
228 (temp >> 8) & 0xff, (temp) & 0xff);
229 return buf;
230}
231
232/*
233 * gettmpdir() -- Returns pointer to global temporary directory string.
234 * Always succeeds. Never attempt to deallocate directory string.
235 */
236
237char *
238gettmpdir(void)
239{
240 char *tmpdirp = NULL((void *)0);
241
242#ifdef AFS_NT40_ENV
243 static char *saveTmpDir = NULL((void *)0);
244
245 if (saveTmpDir == NULL((void *)0)) {
246 /* initialize global temporary directory string */
247 char *dirp = (char *)malloc(MAX_PATH+1);
248 int freeDirp = 1;
249
250 if (dirp != NULL((void *)0)) {
251 DWORD pathLen = GetTempPath(MAX_PATH+1, dirp);
252
253 if (pathLen == 0 || pathLen > MAX_PATH) {
254 /* can't get tmp path; get cur work dir */
255 pathLen = GetCurrentDirectory(MAX_PATH, dirp);
256 if (pathLen == 0 || pathLen > MAX_PATH) {
257 free(dirp);
258 dirp = NULL((void *)0);
259 }
260 }
261
262 if (dirp != NULL((void *)0)) {
263 /* Have a valid dir path; check that actually exists. */
264 DWORD fileAttr = GetFileAttributes(dirp);
265
266 if ((fileAttr == 0xFFFFFFFF)
267 || ((fileAttr & FILE_ATTRIBUTE_DIRECTORY) == 0)) {
268 free(dirp);
269 dirp = NULL((void *)0);
270 }
271 }
272 }
273
274 if (dirp != NULL((void *)0)) {
275 FilepathNormalize(dirp);
276 } else {
277 /* most likely TMP or TEMP env vars specify a non-existent dir */
278 dirp = "/";
279 freeDirp = 0;
280 }
281
282 /* atomically initialize shared buffer pointer IF still null */
283 if (InterlockedCompareExchangePointer(&saveTmpDir, dirp, NULL((void *)0)) != NULL((void *)0)) {
284 /* shared buffer pointer already initialized by another thread */
285 if (freeDirp)
286 free(dirp);
287 }
288 }
289 /* if (!saveTmpDir) */
290 tmpdirp = saveTmpDir;
291#else
292 tmpdirp = "/tmp";
293#endif /* AFS_NT40_ENV */
294
295 return tmpdirp;
296}