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/* $OpenBSD: hostctl.c,v 1.3 2016/01/27 16:01:36 jmc Exp $ */
/*
* Copyright (c) 2016 Reyk Floeter <reyk@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/ioctl.h>
#include <sys/types.h>
#include <dev/pv/pvvar.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <err.h>
#include <vis.h>
#define KVBUFSZ 4096 /* arbitrary value */
char *path_pvbus = "/dev/pvbus0"; /* the first hv interface */
int qflag = 0; /* quiet */
int tflag = 0; /* show type */
__dead void usage(void);
int kvsetstr(char *, const char *, size_t);
int kvsetfile(char *, const char *, size_t);
__dead void
usage(void)
{
extern char *__progname;
fprintf(stderr, "usage: %s [-qt] [-f device] "
"[-i input] [-o output] key [value]\n", __progname);
exit(1);
}
int
kvsetstr(char *dst, const char *src, size_t dstlen)
{
size_t sz;
/* Sanitize the string before sending it to the kernel and host */
if ((sz = strnvis(dst, src, dstlen, VIS_SAFE | VIS_CSTYLE)) >= dstlen)
return (-1);
/* Remove trailing newline */
if (dst[sz - 1] == '\n')
dst[sz - 1] = '\0';
return (0);
}
int
kvsetfile(char *dst, const char *input, size_t dstlen)
{
char *buf = NULL;
int ret = -1;
FILE *fp;
if (strcmp("-", input) == 0)
fp = stdin;
else if ((fp = fopen(input, "r")) == NULL)
return (-1);
if ((buf = calloc(1, dstlen)) == NULL)
goto done;
if (fread(buf, 1, dstlen - 1, fp) == 0)
goto done;
if (kvsetstr(dst, buf, dstlen) == -1)
goto done;
ret = 0;
done:
free(buf);
if (fp != stdin)
fclose(fp);
return (ret);
}
int
main(int argc, char *argv[])
{
const char *key, *value, *in = NULL, *out = NULL;
FILE *outfp = stdout;
int fd, ret;
struct pvbus_req pvr;
int ch;
unsigned long cmd = 0;
char *str;
while ((ch = getopt(argc, argv, "f:i:o:qt")) != -1) {
switch (ch) {
case 'f':
path_pvbus = optarg;
break;
case 'i':
in = optarg;
break;
case 'o':
out = optarg;
break;
case 'q':
qflag++;
break;
case 't':
tflag++;
break;
default:
usage();
}
}
argc -= optind;
argv += optind;
if ((fd = open(path_pvbus, O_RDONLY)) == -1)
err(1, "open: %s", path_pvbus);
if (out != NULL) {
if (strcmp("-", out) == 0)
outfp = stdout;
else if ((outfp = fopen(out, "w")) == NULL)
err(1, "fopen: %s", out);
}
memset(&pvr, 0, sizeof(pvr));
pvr.pvr_keylen = pvr.pvr_valuelen = KVBUFSZ;
if ((pvr.pvr_key = calloc(1, pvr.pvr_keylen)) == NULL ||
(pvr.pvr_value = calloc(1, pvr.pvr_valuelen)) == NULL)
err(1, "calloc");
if (tflag) {
if (ioctl(fd, PVBUSIOC_TYPE, &pvr, sizeof(pvr)) != 0)
err(1, "ioctl");
/* The returned type should be a simple single-line key */
if (stravis(&str, pvr.pvr_key,
VIS_WHITE | VIS_DQ | VIS_CSTYLE) == -1)
err(1, "stravis");
fprintf(outfp, "%s: %s\n", path_pvbus, str);
free(str);
goto done;
}
if (argc < 1)
usage();
key = argv[0];
if (kvsetstr(pvr.pvr_key, key, pvr.pvr_keylen) == -1)
errx(1, "key too long");
/* Validate command line options for reading or writing */
if (argc == 2 && in == NULL) {
cmd = PVBUSIOC_KVWRITE;
value = argv[1];
if (kvsetstr(pvr.pvr_value, value, pvr.pvr_valuelen) == -1)
errx(1, "value too long");
} else if (argc == 1 && in != NULL) {
cmd = PVBUSIOC_KVWRITE;
if (kvsetfile(pvr.pvr_value, in, pvr.pvr_valuelen) == -1)
errx(1, "input file");
} else if (argc == 1) {
cmd = cmd == 0 ? PVBUSIOC_KVREAD : cmd;
} else
usage();
/* Re-open read-writable */
if (cmd == PVBUSIOC_KVWRITE) {
close(fd);
if ((fd = open(path_pvbus, O_RDWR)) == -1)
err(1, "open: %s", path_pvbus);
}
if ((ret = ioctl(fd, cmd, &pvr, sizeof(pvr))) != 0)
err(1, "ioctl");
if (!qflag && strlen(pvr.pvr_value)) {
/*
* The value can contain newlines and basically anything;
* only encode the unsafe characters that could perform
* unexpected functions on the terminal.
*/
if (stravis(&str, pvr.pvr_value, VIS_SAFE | VIS_CSTYLE) == -1)
err(1, "stravis");
fprintf(outfp, "%s\n", str);
free(str);
}
done:
if (outfp != stdout)
fclose(outfp);
free(pvr.pvr_value);
free(pvr.pvr_key);
close(fd);
return (0);
}
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