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Rework pa_machine_id() a bit

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Guarantee this function never fails, use POSIX gethostid as last resort. Add
comments.
This commit is contained in:
Lennart Poettering 2008-09-03 18:30:27 +02:00
parent 5f931138d2
commit 99d5ec6c93
1 changed files with 27 additions and 10 deletions
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37
src/pulsecore/core-util.c
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@ -2391,18 +2391,29 @@ char *pa_machine_id(void) {
FILE *f;
size_t l;
/* The returned value is supposed be some kind of ascii identifier
* that is unique and stable across reboots. */
/* First we try the D-Bus UUID, which is the best option we have,
* since it fits perfectly our needs and is not as volatile as the
* hostname which might be set from dhcp. */
if ((f = fopen(PA_MACHINE_ID, "r"))) {
char ln[34] = "", *r;
r = fgets(ln, sizeof(ln)-1, f);
fclose(f);
if (r)
return pa_xstrdup(pa_strip_nl(ln));
pa_strip_nl(ln);
if (ln[0])
return pa_xstrdup(ln);
}
l = 100;
/* The we fall back to the host name. It supposed to be somewhat
* unique, at least in a network, but may change. */
l = 100;
for (;;) {
char *c;
@ -2410,17 +2421,18 @@ char *pa_machine_id(void) {
if (!pa_get_host_name(c, l)) {
if (errno == EINVAL || errno == ENAMETOOLONG) {
if (errno != EINVAL && errno != ENAMETOOLONG)
break;
} else if (strlen(c) < l-1) {
if (*c == 0) {
pa_xfree(c);
l *= 2;
continue;
break;
}
return NULL;
}
if (strlen(c) < l-1)
return c;
}
/* Hmm, the hostname is as long the space we offered the
* function, we cannot know if it fully fit in, so let's play
@ -2429,4 +2441,9 @@ char *pa_machine_id(void) {
pa_xfree(c);
l *= 2;
}
/* If no hostname was set we use the POSIX hostid. It's usually
* the IPv4 address. Mit not be that stable. */
return pa_sprintf_malloc("%08lx", (unsigned long) gethostid);
}