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Make str_to_num() check for ERANGE, use it instead of atoi().

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This commit is contained in:
Emil Mikulic 2015-01-01 21:00:57 +11:00
parent 4c8b1e22f3
commit d5bd7558f4
1 changed files with 34 additions and 17 deletions
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51
darkhttpd.c
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@ -912,17 +912,33 @@ static void usage(const char *argv0) {
/* Returns 1 if string is a number, 0 otherwise. Set num to NULL if
* disinterested in value.
*/
static int str_to_num(const char *str, int *num) {
static int str_to_num(const char *str, long long *num) {
char *endptr;
long long n;
long l = strtol(str, &endptr, 10);
errno = 0;
n = strtoll(str, &endptr, 10);
if (*endptr != '\0')
return 0;
if (n == LLONG_MIN && errno == ERANGE)
return 0;
if (n == LLONG_MAX && errno == ERANGE)
return 0;
if (num != NULL)
*num = (int)l;
*num = n;
return 1;
}
/* Returns a valid number or dies. */
static long long xstr_to_num(const char *str) {
long long ret;
if (!str_to_num(str, &ret)) {
errx(1, "number \"%s\" is invalid", str);
}
return ret;
}
static void parse_commandline(const int argc, char *argv[]) {
int i;
size_t len;
@ -947,7 +963,7 @@ static void parse_commandline(const int argc, char *argv[]) {
if (strcmp(argv[i], "--port") == 0) {
if (++i >= argc)
errx(1, "missing number after --port");
bindport = (uint16_t)atoi(argv[i]);
bindport = xstr_to_num(argv[i]);
}
else if (strcmp(argv[i], "--addr") == 0) {
if (++i >= argc)
@ -959,7 +975,7 @@ static void parse_commandline(const int argc, char *argv[]) {
else if (strcmp(argv[i], "--maxconn") == 0) {
if (++i >= argc)
errx(1, "missing number after --maxconn");
max_connections = atoi(argv[i]);
max_connections = xstr_to_num(argv[i]);
}
else if (strcmp(argv[i], "--log") == 0) {
if (++i >= argc)
@ -984,27 +1000,27 @@ static void parse_commandline(const int argc, char *argv[]) {
}
else if (strcmp(argv[i], "--uid") == 0) {
struct passwd *p;
int num;
if (++i >= argc)
errx(1, "missing uid after --uid");
p = getpwnam(argv[i]);
if ((p == NULL) && (str_to_num(argv[i], &num)))
p = getpwuid( (uid_t)num );
if (p == NULL)
if (!p) {
p = getpwuid((uid_t)xstr_to_num(argv[i]));
}
if (!p)
errx(1, "no such uid: `%s'", argv[i]);
drop_uid = p->pw_uid;
}
else if (strcmp(argv[i], "--gid") == 0) {
struct group *g;
int num;
if (++i >= argc)
errx(1, "missing gid after --gid");
g = getgrnam(argv[i]);
if ((g == NULL) && (str_to_num(argv[i], &num)))
g = getgrgid((gid_t)num);
if (g == NULL)
if (!g) {
g = getgrgid((gid_t)xstr_to_num(argv[i]));
}
if (!g) {
errx(1, "no such gid: `%s'", argv[i]);
}
drop_gid = g->gr_gid;
}
else if (strcmp(argv[i], "--pidfile") == 0) {
@ -2419,7 +2435,8 @@ static void pidfile_remove(void) {
static int pidfile_read(void) {
char buf[16], *endptr;
int fd, i, pid;
int fd, i;
long long pid;
fd = open(pidfile_name, O_RDONLY);
if (fd == -1)
@ -2431,9 +2448,9 @@ static int pidfile_read(void) {
xclose(fd);
buf[i] = '\0';
pid = (int)strtoul(buf, &endptr, 10);
if (endptr != &buf[i])
if (!str_to_num(buf, &pid)) {
err(1, "invalid pidfile contents: \"%s\"", buf);
}
return (pid);
}