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"notify": address Joachim Wiberg's comments (pull/45)

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This commit is contained in:
Steffen Nurpmeso 2022-03-12 16:46:46 +01:00
parent bc103013cb
commit 7038e51a0f
1 changed files with 36 additions and 21 deletions
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57
src/syslogd.c
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@ -190,6 +190,7 @@ int decode(char *name, struct _code *codetab);
static void logit(char *, ...);
static void notifier_add(struct notifiers *newn, const char *program);
static void notifier_invoke(const char *logfile);
static void notifier_free_all(void);
void reload(int);
static int validate(struct sockaddr *sa, const char *hname);
static int waitdaemon(int);
@ -2260,7 +2261,6 @@ void debug_switch(int signo)
*/
static void close_open_log_files(void)
{
struct notifier *np = NULL, *npnext = NULL;
struct filed *f = NULL, *next = NULL;
SIMPLEQ_FOREACH_SAFE(f, &fhead, f_link, next) {
@ -2287,9 +2287,6 @@ static void close_open_log_files(void)
free(f);
}
SIMPLEQ_FOREACH_SAFE(np, &nothead, n_link, npnext)
free(np);
}
void die(int signo)
@ -2565,6 +2562,12 @@ static void init(void)
close_open_log_files();
fhead = newf;
/*
* Free all notifiers
*/
notifier_free_all();
nothead = newn;
Initialized = 1;
@ -3370,23 +3373,24 @@ static void logit(char *fmt, ...)
static void notifier_add(struct notifiers *newn, const char *program)
{
while (*program && isspace(*program))
program++;
++program;
/* Check whether it is accessible, regardless of TOCTOU */
if (!access(program, X_OK)) {
struct notifier *np;
size_t len;
len = strlen(program);
np = calloc(1, sizeof(*np) + len +1);
if (np) {
/* xxx Actually wastes space -- vararray? */
np->n_program = (char*)&np[1];
memcpy(np->n_program, program, len);
SIMPLEQ_INSERT_TAIL(newn, np, n_link);
} else
np = calloc(1, sizeof(*np));
if (!np) {
ERR("Cannot allocate memory for a notify program");
return;
}
np->n_program = strdup(program);
if (!np->n_program) {
free (np);
ERR("Cannot allocate memory for a notify program");
return;
}
SIMPLEQ_INSERT_TAIL(newn, np, n_link);
} else
logit("notify: non-existing, or not executable program\n");
}
@ -3394,31 +3398,42 @@ static void notifier_add(struct notifiers *newn, const char *program)
static void notifier_invoke(const char *logfile)
{
char *argv[3];
int childpid;
struct notifier *np;
logit("notify: rotated %s, invoking hooks\n", logfile);
SIMPLEQ_FOREACH(np, &nothead, n_link) {
switch (fork()) {
childpid = fork();
switch (childpid) {
case -1:
ERR("Cannot start notifier %s", np->n_program);
break;
case 0:
/* No specific I/O setup, just use what we had */
argv[0] = np->n_program;
argv[1] = (char*)logfile; /* logical unconst */
argv[1] = (char*)logfile;
argv[2] = NULL;
execv(argv[0], argv);
_exit(1);
default:
/* Do not care beside that, no special process group
* etc.; it will eventually be reaped via reapchild() */
logit("notify: forked for %s\n", np->n_program);
logit("notify: forked child pid %d for %s\n",
childpid, np->n_program);
break;
}
}
}
static void notifier_free_all(void)
{
struct notifier *np, *npnext;
SIMPLEQ_FOREACH_SAFE(np, &nothead, n_link, npnext) {
free(np->n_program);
free(np);
}
}
/*
* The following function is resposible for handling a SIGHUP signal. Since
* we are now doing mallocs/free as part of init we had better not being