File: | src/usr.sbin/hostctl/hostctl.c |
Warning: | line 185, column 8 Although the value stored to 'ret' is used in the enclosing expression, the value is never actually read from 'ret' |
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1 | /* $OpenBSD: hostctl.c,v 1.6 2023/01/07 06:40:21 asou Exp $ */ |
2 | |
3 | /* |
4 | * Copyright (c) 2016 Reyk Floeter <reyk@openbsd.org> |
5 | * |
6 | * Permission to use, copy, modify, and distribute this software for any |
7 | * purpose with or without fee is hereby granted, provided that the above |
8 | * copyright notice and this permission notice appear in all copies. |
9 | * |
10 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
11 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
12 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
13 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
14 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
15 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
16 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
17 | */ |
18 | |
19 | #include <sys/ioctl.h> |
20 | #include <sys/types.h> |
21 | |
22 | #include <dev/pv/pvvar.h> |
23 | |
24 | #include <stdio.h> |
25 | #include <stdlib.h> |
26 | #include <string.h> |
27 | #include <unistd.h> |
28 | #include <fcntl.h> |
29 | #include <errno(*__errno()).h> |
30 | #include <err.h> |
31 | #include <vis.h> |
32 | |
33 | #define KVBUFSZ4096 4096 /* arbitrary value */ |
34 | |
35 | char *path_pvbus = "/dev/pvbus0"; /* the first hv interface */ |
36 | int qflag = 0; /* quiet */ |
37 | int tflag = 0; /* show type */ |
38 | |
39 | __dead__attribute__((__noreturn__)) void usage(void); |
40 | int kvsetstr(char *, const char *, size_t); |
41 | int kvsetfile(char *, const char *, size_t); |
42 | |
43 | __dead__attribute__((__noreturn__)) void |
44 | usage(void) |
45 | { |
46 | extern char *__progname; |
47 | fprintf(stderr(&__sF[2]), "usage: %s [-qt] [-f device] " |
48 | "[-i input] [-o output] key [value]\n", __progname); |
49 | exit(1); |
50 | } |
51 | |
52 | int |
53 | kvsetstr(char *dst, const char *src, size_t dstlen) |
54 | { |
55 | size_t sz; |
56 | |
57 | /* Sanitize the string before sending it to the kernel and host */ |
58 | if ((sz = strnvis(dst, src, dstlen, VIS_SAFE0x20 | VIS_CSTYLE0x02)) >= dstlen) |
59 | return (-1); |
60 | |
61 | /* Remove trailing newline */ |
62 | dst[strcspn(dst, "\n")] = '\0'; |
63 | |
64 | return (0); |
65 | } |
66 | |
67 | int |
68 | kvsetfile(char *dst, const char *input, size_t dstlen) |
69 | { |
70 | char *buf = NULL((void *)0); |
71 | int ret = -1; |
72 | FILE *fp; |
73 | |
74 | if (strcmp("-", input) == 0) |
75 | fp = stdin(&__sF[0]); |
76 | else if ((fp = fopen(input, "r")) == NULL((void *)0)) |
77 | return (-1); |
78 | |
79 | if ((buf = calloc(1, dstlen)) == NULL((void *)0)) |
80 | goto done; |
81 | if (fread(buf, 1, dstlen - 1, fp) == 0) |
82 | goto done; |
83 | if (kvsetstr(dst, buf, dstlen) == -1) |
84 | goto done; |
85 | |
86 | ret = 0; |
87 | done: |
88 | free(buf); |
89 | if (fp != stdin(&__sF[0])) |
90 | fclose(fp); |
91 | return (ret); |
92 | } |
93 | |
94 | int |
95 | main(int argc, char *argv[]) |
96 | { |
97 | const char *key, *value, *in = NULL((void *)0), *out = NULL((void *)0); |
98 | FILE *outfp = stdout(&__sF[1]); |
99 | int fd, ret; |
100 | struct pvbus_req pvr; |
101 | int ch; |
102 | unsigned long cmd = 0; |
103 | char *str; |
104 | |
105 | while ((ch = getopt(argc, argv, "f:i:o:qt")) != -1) { |
106 | switch (ch) { |
107 | case 'f': |
108 | path_pvbus = optarg; |
109 | break; |
110 | case 'i': |
111 | in = optarg; |
112 | break; |
113 | case 'o': |
114 | out = optarg; |
115 | break; |
116 | case 'q': |
117 | qflag++; |
118 | break; |
119 | case 't': |
120 | tflag++; |
121 | break; |
122 | default: |
123 | usage(); |
124 | } |
125 | } |
126 | argc -= optind; |
127 | argv += optind; |
128 | |
129 | if ((fd = open(path_pvbus, O_RDONLY0x0000)) == -1) |
130 | err(1, "open: %s", path_pvbus); |
131 | |
132 | if (out != NULL((void *)0)) { |
133 | if (strcmp("-", out) == 0) |
134 | outfp = stdout(&__sF[1]); |
135 | else if ((outfp = fopen(out, "w")) == NULL((void *)0)) |
136 | err(1, "fopen: %s", out); |
137 | } |
138 | |
139 | memset(&pvr, 0, sizeof(pvr)); |
140 | pvr.pvr_keylen = pvr.pvr_valuelen = KVBUFSZ4096; |
141 | if ((pvr.pvr_key = calloc(1, pvr.pvr_keylen)) == NULL((void *)0) || |
142 | (pvr.pvr_value = calloc(1, pvr.pvr_valuelen)) == NULL((void *)0)) |
143 | err(1, "calloc"); |
144 | |
145 | if (tflag) { |
146 | if (ioctl(fd, PVBUSIOC_TYPE(((unsigned long)0x80000000|(unsigned long)0x40000000) | ((sizeof (struct pvbus_req) & 0x1fff) << 16) | ((('V')) << 8) | ((3))), &pvr, sizeof(pvr)) == -1) |
147 | err(1, "ioctl"); |
148 | |
149 | /* The returned type should be a simple single-line key */ |
150 | if (stravis(&str, pvr.pvr_key, |
151 | VIS_WHITE(0x04 | 0x08 | 0x10) | VIS_DQ0x200 | VIS_CSTYLE0x02) == -1) |
152 | err(1, "stravis"); |
153 | fprintf(outfp, "%s: %s\n", path_pvbus, str); |
154 | free(str); |
155 | goto done; |
156 | } |
157 | |
158 | if (argc < 1) |
159 | usage(); |
160 | key = argv[0]; |
161 | |
162 | if (kvsetstr(pvr.pvr_key, key, pvr.pvr_keylen) == -1) |
163 | errx(1, "key too long"); |
164 | |
165 | /* Validate command line options for reading or writing */ |
166 | if (argc == 2 && in == NULL((void *)0)) { |
167 | cmd = PVBUSIOC_KVWRITE(((unsigned long)0x80000000|(unsigned long)0x40000000) | ((sizeof (struct pvbus_req) & 0x1fff) << 16) | ((('V')) << 8) | ((2))); |
168 | value = argv[1]; |
169 | if (kvsetstr(pvr.pvr_value, value, pvr.pvr_valuelen) == -1) |
170 | errx(1, "value too long"); |
171 | } else if (argc == 1 && in != NULL((void *)0)) { |
172 | cmd = PVBUSIOC_KVWRITE(((unsigned long)0x80000000|(unsigned long)0x40000000) | ((sizeof (struct pvbus_req) & 0x1fff) << 16) | ((('V')) << 8) | ((2))); |
173 | if (kvsetfile(pvr.pvr_value, in, pvr.pvr_valuelen) == -1) |
174 | errx(1, "input file"); |
175 | } else if (argc == 1) { |
176 | cmd = cmd == 0 ? PVBUSIOC_KVREAD(((unsigned long)0x80000000|(unsigned long)0x40000000) | ((sizeof (struct pvbus_req) & 0x1fff) << 16) | ((('V')) << 8) | ((1))) : cmd; |
177 | } else |
178 | usage(); |
179 | |
180 | /* Re-open read-writable */ |
181 | if (cmd != PVBUSIOC_KVREAD(((unsigned long)0x80000000|(unsigned long)0x40000000) | ((sizeof (struct pvbus_req) & 0x1fff) << 16) | ((('V')) << 8) | ((1)))) { |
182 | close(fd); |
183 | if ((fd = open(path_pvbus, O_RDWR0x0002)) == -1) |
184 | err(1, "open: %s", path_pvbus); |
185 | if ((ret = ioctl(fd, cmd, &pvr, sizeof(pvr))) == -1) |
Although the value stored to 'ret' is used in the enclosing expression, the value is never actually read from 'ret' | |
186 | err(1, "ioctl"); |
187 | } else { |
188 | while (1) { |
189 | if ((ret = ioctl(fd, cmd, &pvr, sizeof(pvr))) == 0) |
190 | break; |
191 | if (errno(*__errno()) == ERANGE34 && |
192 | pvr.pvr_valuelen < PVBUS_KVOP_MAXSIZE(64 * 1024)) { |
193 | /* the buffer is not enough, expand it */ |
194 | pvr.pvr_valuelen *= 2; |
195 | if ((pvr.pvr_value = realloc(pvr.pvr_value, |
196 | pvr.pvr_valuelen)) == NULL((void *)0)) |
197 | err(1, "realloc"); |
198 | continue; |
199 | } |
200 | err(1, "ioctl"); |
201 | } |
202 | } |
203 | |
204 | if (!qflag && strlen(pvr.pvr_value)) { |
205 | /* |
206 | * The value can contain newlines and basically anything; |
207 | * only encode the unsafe characters that could perform |
208 | * unexpected functions on the terminal. |
209 | */ |
210 | if (stravis(&str, pvr.pvr_value, VIS_SAFE0x20 | VIS_CSTYLE0x02) == -1) |
211 | err(1, "stravis"); |
212 | fprintf(outfp, "%s\n", str); |
213 | free(str); |
214 | } |
215 | |
216 | done: |
217 | if (outfp != stdout(&__sF[1])) |
218 | fclose(outfp); |
219 | free(pvr.pvr_value); |
220 | free(pvr.pvr_key); |
221 | close(fd); |
222 | |
223 | return (0); |
224 | } |