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boot_root_nfs.c
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boot_root_nfs.c
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#include <stdio.h>
#define nmount(iov, niov, flags) my_nmount(iov, niov, flags)
#define add_mtab my_add_mtab
#include <mount_nfs.c>
int
my_add_mtab(char *a, char *b)
{
return (1);
}
char *
format_nfshandle(char *handle, int len)
{
char *s;
int slen;
slen = len * 2 + 2 + 1;
s = calloc(slen, 1);
strlcat(s, "X", slen);
for (int i = 0; i < len; i++) {
snprintf(s + i*2 + 1, 3, "%02x", (unsigned char)handle[i]);
}
strlcat(s, "X", slen);
return s;
}
int
my_nmount(struct iovec *iov, u_int niov, int flags)
{
#if 0
printf("niov=%d\n", niov);
for (int i=0; i<niov; i+=2) {
if (iov[i+1].iov_len > 0) {
printf("%02d=%02ld: %s=%s\n", i/2, iov[i+1].iov_len, iov[i].iov_base, iov[i+1].iov_base);
} else {
printf("%02d=%02ld: %s\n", i/2, iov[i+1].iov_len, iov[i].iov_base);
}
}
#endif
/* extract relevant parameters from iov */
for (int i=0; i<niov; i+=2) {
if (strcmp("addr", iov[i].iov_base) == 0) {
struct sockaddr_in *sin = iov[i+1].iov_base;
if (sin->sin_family != AF_INET) {
fprintf(stderr, "FreeBSD diskless only supports IPv4, but the server address is in a different family");
exit(1);
}
in_addr_t a = ntohl(sin->sin_addr.s_addr);
char s[256];
inet_ntop(AF_INET, &(sin->sin_addr), s, sizeof(s));
printf("-e boot.nfsroot.server=%s\n", s);
}
if (strcmp("fh", iov[i].iov_base) == 0) {
char *p = format_nfshandle(iov[i+1].iov_base, iov[i+1].iov_len);
printf("-e boot.nfsroot.nfshandle=%s\n", p);
printf("-e boot.nfsroot.nfshandlelen=%ld\n", iov[i+1].iov_len);
free(p);
}
if (strcmp("hostname", iov[i].iov_base) == 0) {
char *p = strchr(iov[i+1].iov_base, ':');
if (p == NULL)
p = iov[i+1].iov_base;
else
p++;
printf("-e boot.nfsroot.path=%s\n", p);
}
}
return (0);
}