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Add initial support for OpenNebula contextualization.

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Thanks to datacenterlight.ch by ungleich glarus AG for providing
access to their OpenNebula-based cloud.
This commit is contained in:
reykfloeter 2018-08-13 19:30:41 +02:00
commit d9899d488a
8 changed files with 449 additions and 25 deletions
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209
agent/opennebula.c Normal file
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@ -0,0 +1,209 @@
/*
* Copyright (c) 2018 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 <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <unistd.h>
#include <fnmatch.h>
#include <fcntl.h>
#include <ctype.h>
#include <sha2.h>
#include <err.h>
#include <util.h>
#include "main.h"
int
opennebula(struct system_config *sc)
{
FILE *fp;
const char *delim = "\\\\\0", *errstr;
char *line = NULL, *k, *v, *p, q;
char *hname = NULL;
size_t len, lineno = 0, i;
int ret = -1;
unsigned int unit;
/* Return silently without error */
if ((fp = fopen("/mnt/context.sh", "r")) == NULL)
goto done;
sc->sc_stack = "opennebula";
while ((line = fparseln(fp, &len, &lineno,
delim, FPARSELN_UNESCALL)) != NULL) {
/* key */
k = line;
/* a context always starts with this header */
if (lineno == 1) {
ret = strcmp(line,
"# Context variables generated by OpenNebula");
if (ret != 0) {
log_debug("%s: unsupported context", __func__);
goto done;
}
free(line);
continue;
}
line[strcspn(line, "#")] = '\0';
/* value */
if ((v = strchr(line, '=')) == NULL || *(v + 1) == '\0') {
free(line);
continue;
}
*v++ = '\0';
/* value is quoted */
q = *v;
if (strspn(v, "\"'") == 0 || (p = strrchr(v, q)) == v) {
free(line);
continue;
}
*v++ = '\0';
*p = '\0';
/* continue if value is empty */
if (*v == '\0') {
free(line);
continue;
}
log_debug("%s: %s = %s", __func__, k, v);
if (strcasecmp("NETWORK", k) == 0) {
if (strcasecmp("YES", v) == 0)
sc->sc_network = 1;
else if (strcasecmp("YES", v) == 0)
sc->sc_network = 0;
} else if (fnmatch("ETH*_*", k, 0) != FNM_NOMATCH) {
/* Extract interface unit */
if ((p = strdup(k + 3)) == NULL) {
log_debug("%s: %s", __func__, k);
goto done;
}
p[strcspn(p, "_")] = '\0';
unit = strtonum(p, 0, UINT32_MAX, &errstr);
free(p);
if (errstr != NULL) {
log_debug("%s: %s", __func__, k);
goto done;
}
/* Get subkey */
k += strcspn(k, "_") + 1;
if (strcasecmp("DNS", k) == 0) {
/* We don't support per-interface DNS */
for (p = v; *p != '\0'; v = p) {
p = v + strcspn(v, " \t");
*p++ = '\0';
if ((ret = agent_addnetaddr(sc, 0,
v, AF_UNSPEC, NET_DNS)) != 0)
break;
}
} else if (strcasecmp("IP", k) == 0) {
ret = agent_addnetaddr(sc, unit,
v, AF_INET, NET_IP);
} else if (strcasecmp("MASK", k) == 0) {
ret = agent_addnetaddr(sc, unit,
v, AF_INET, NET_MASK);
} else if (strcasecmp("GATEWAY", k) == 0) {
ret = agent_addnetaddr(sc, unit,
v, AF_INET, NET_GATEWAY);
} else if (strcasecmp("IP6", k) == 0) {
ret = agent_addnetaddr(sc, unit,
v, AF_INET6, NET_IP);
} else if (strcasecmp("GATEWAY6", k) == 0) {
ret = agent_addnetaddr(sc, unit,
v, AF_INET6, NET_GATEWAY);
} else if (strcasecmp("PREFIX_LENGTH", k) == 0) {
ret = agent_addnetaddr(sc, unit,
v, AF_INET6, NET_PREFIX);
} else if (strcasecmp("MAC", k) == 0) {
if (unit == 0 && hname == NULL) {
/* Fake a hostname using the mac */
if ((hname = p = calloc(1,
strlen(v) + 3)) == NULL) {
log_debug("%s: calloc",
__func__);
goto done;
}
*p++ = 'v';
*p++ = 'm';
for (i = 0; i < strlen(v); i++) {
if (!isalnum(v[i]))
continue;
*p++ = v[i];
}
}
ret = agent_addnetaddr(sc, unit,
v, AF_UNSPEC, NET_MAC);
} else if (strcasecmp("MTU", k) == 0) {
ret = agent_addnetaddr(sc, unit,
v, AF_UNSPEC, NET_MTU);
} else
ret = 0;
if (ret != 0) {
log_debug("%s: failed to parse %s",
__func__, k);
goto done;
}
} else if (strcasecmp("SSH_PUBLIC_KEY", k) == 0) {
if (agent_addpubkey(sc, v, NULL) != 0)
log_warnx("failed to ssh pubkey");
}
free(line);
}
fclose(fp);
fp = NULL;
/*
* OpenNebula doesn't provide an instance id so we
* calculate one using the hash of the context file.
* This might break if the context is not consistent.
*/
if ((sc->sc_instance =
calloc(1, SHA256_DIGEST_STRING_LENGTH)) == NULL ||
SHA256File("/mnt/context.sh", sc->sc_instance) == NULL) {
log_debug("%s: failed to calculate instance hash",
__func__);
goto done;
}
log_debug("%s: context instance %s", __func__, sc->sc_instance);
/* Even the hostname is optional */
if (hname != NULL) {
free(sc->sc_hostname);
sc->sc_hostname = hname;
log_debug("%s: hostname %s", __func__, hname);
}
line = NULL;
ret = 0;
done:
if (fp != NULL)
fclose(fp);
free(line);
return (ret);
}