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/* Written by Kris Maglione <fbsdaemon at gmail dot com> */
/* Public domain */
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <pwd.h>
#include "ixp_local.h"
char*
ixp_smprint(const char *fmt, ...) {
va_list ap;
char *s;
va_start(ap, fmt);
s = ixp_vsmprint(fmt, ap);
va_end(ap);
if(s == nil)
ixp_werrstr("no memory");
return s;
}
static char*
_user(void) {
static char *user;
struct passwd *pw;
if(user == nil) {
pw = getpwuid(getuid());
if(pw)
user = strdup(pw->pw_name);
}
if(user == nil)
user = "none";
return user;
}
static int
rmkdir(char *path, int mode) {
char *p;
int ret;
char c;
for(p = path+1; ; p++) {
c = *p;
if((c == '/') || (c == '\0')) {
*p = '\0';
ret = mkdir(path, mode);
if((ret == -1) && (errno != EEXIST)) {
ixp_werrstr("Can't create path '%s': %s", path, ixp_errbuf());
return 0;
}
*p = c;
}
if(c == '\0')
break;
}
return 1;
}
static char*
ns_display(void) {
char *path, *disp;
struct stat st;
disp = getenv("DISPLAY");
if(disp == nil || disp[0] == '\0') {
ixp_werrstr("$DISPLAY is unset");
return nil;
}
disp = estrdup(disp);
path = &disp[strlen(disp) - 2];
if(path > disp && !strcmp(path, ".0"))
*path = '\0';
path = ixp_smprint("/tmp/ns.%s.%s", _user(), disp);
free(disp);
if(!rmkdir(path, 0700))
;
else if(stat(path, &st))
ixp_werrstr("Can't stat ns_path '%s': %s", path, ixp_errbuf());
else if(getuid() != st.st_uid)
ixp_werrstr("ns_path '%s' exists but is not owned by you", path);
else if((st.st_mode & 077) && chmod(path, st.st_mode & ~077))
ixp_werrstr("Namespace path '%s' exists, but has wrong permissions: %s", path, ixp_errbuf());
else
return path;
free(path);
return nil;
}
/**
* Function: ixp_namespace
*
* Returns the path of the canonical 9p namespace directory.
* Either the value of $NAMESPACE, if it's set, or, roughly,
* /tmp/ns.${USER}.${DISPLAY:%.0=%}. In the latter case, the
* directory is created if it doesn't exist, and it is
* ensured to be owned by the current user, with no group or
* other permissions.
*
* Returns:
* A statically allocated string which must not be freed
* or altered by the caller. The same value is returned
* upon successive calls.
*/
/* Not especially threadsafe. */
char*
ixp_namespace(void) {
static char *namespace;
if(namespace == nil)
namespace = getenv("NAMESPACE");
if(namespace == nil)
namespace = ns_display();
return namespace;
}
void
eprint(const char *fmt, ...) {
va_list ap;
int err;
err = errno;
fprintf(stderr, "libixp: fatal: ");
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
if(fmt[strlen(fmt)-1] == ':')
fprintf(stderr, " %s\n", strerror(err));
else
fprintf(stderr, "\n");
exit(1);
}
/* Can't malloc */
static void
mfatal(char *name, uint size) {
const char
couldnot[] = "libixp: fatal: Could not ",
paren[] = "() ",
bytes[] = " bytes\n";
char sizestr[8];
int i;
i = sizeof sizestr;
do {
sizestr[--i] = '0' + (size%10);
size /= 10;
} while(size > 0);
write(1, couldnot, sizeof(couldnot)-1);
write(1, name, strlen(name));
write(1, paren, sizeof(paren)-1);
write(1, sizestr+i, sizeof(sizestr)-i);
write(1, bytes, sizeof(bytes)-1);
exit(1);
}
void*
emalloc(uint size) {
void *ret = malloc(size);
if(!ret)
mfatal("malloc", size);
return ret;
}
void*
emallocz(uint size) {
void *ret = emalloc(size);
memset(ret, 0, size);
return ret;
}
void*
erealloc(void *ptr, uint size) {
void *ret = realloc(ptr, size);
if(!ret)
mfatal("realloc", size);
return ret;
}
char*
estrdup(const char *str) {
void *ret = strdup(str);
if(!ret)
mfatal("strdup", strlen(str));
return ret;
}
uint
tokenize(char *res[], uint reslen, char *str, char delim) {
char *s;
uint i;
i = 0;
s = str;
while(i < reslen && *s) {
while(*s == delim)
*(s++) = '\0';
if(*s)
res[i++] = s;
while(*s && *s != delim)
s++;
}
return i;
}
uint
strlcat(char *dst, const char *src, uint size) {
const char *s;
char *d;
int n, len;
d = dst;
s = src;
n = size;
while(n-- > 0 && *d != '\0')
d++;
len = n;
while(*s != '\0' && n-- > 0)
*d++ = *s++;
while(*s++ != '\0')
n--;
if(len > 0)
*d = '\0';
return size - n - 1;
}
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