| File: | src/usr.sbin/hostctl/hostctl.c |
| Warning: | line 58, column 7 Although the value stored to 'sz' is used in the enclosing expression, the value is never actually read from 'sz' |
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| 1 | /* $OpenBSD: hostctl.c,v 1.5 2019/06/28 13:32:47 deraadt 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) |
Although the value stored to 'sz' is used in the enclosing expression, the value is never actually read from 'sz' | |
| 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_KVWRITE(((unsigned long)0x80000000|(unsigned long)0x40000000) | ((sizeof (struct pvbus_req) & 0x1fff) << 16) | ((('V')) << 8) | ((2)))) { |
| 182 | close(fd); |
| 183 | if ((fd = open(path_pvbus, O_RDWR0x0002)) == -1) |
| 184 | err(1, "open: %s", path_pvbus); |
| 185 | } |
| 186 | |
| 187 | if ((ret = ioctl(fd, cmd, &pvr, sizeof(pvr))) == -1) |
| 188 | err(1, "ioctl"); |
| 189 | |
| 190 | if (!qflag && strlen(pvr.pvr_value)) { |
| 191 | /* |
| 192 | * The value can contain newlines and basically anything; |
| 193 | * only encode the unsafe characters that could perform |
| 194 | * unexpected functions on the terminal. |
| 195 | */ |
| 196 | if (stravis(&str, pvr.pvr_value, VIS_SAFE0x20 | VIS_CSTYLE0x02) == -1) |
| 197 | err(1, "stravis"); |
| 198 | fprintf(outfp, "%s\n", str); |
| 199 | free(str); |
| 200 | } |
| 201 | |
| 202 | done: |
| 203 | if (outfp != stdout(&__sF[1])) |
| 204 | fclose(outfp); |
| 205 | free(pvr.pvr_value); |
| 206 | free(pvr.pvr_key); |
| 207 | close(fd); |
| 208 | |
| 209 | return (0); |
| 210 | } |