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Tighten up integer argument parsing

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This commit is contained in:
Christopher Wellons 2019-02-03 09:42:27 -05:00
parent 4bd7b1a3ea
commit d5726be23d
1 changed files with 6 additions and 2 deletions
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8
endlessh.c
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@ -273,6 +273,7 @@ main(int argc, char **argv)
char *end;
switch (option) {
case 'd':
errno = 0;
delay = strtol(optarg, &end, 10);
if (errno || *end || delay < 0) {
fprintf(stderr, "endlessh: Invalid delay: %s\n", optarg);
@ -284,6 +285,7 @@ main(int argc, char **argv)
exit(EXIT_SUCCESS);
break;
case 'l':
errno = 0;
tmp = strtol(optarg, &end, 10);
if (errno || *end || tmp < 3 || tmp > 255) {
fprintf(stderr, "endlessh: Invalid line length: %s\n",
@ -293,8 +295,9 @@ main(int argc, char **argv)
max_length = tmp;
break;
case 'm':
errno = 0;
tmp = strtol(optarg, &end, 10);
if (errno || *end || tmp < 0 || tmp > INT_MAX) {
if (errno || *end || tmp < 1 || tmp > INT_MAX) {
fprintf(stderr, "endlessh: Invalid max clients: %s\n",
optarg);
exit(EXIT_FAILURE);
@ -302,8 +305,9 @@ main(int argc, char **argv)
max_clients = tmp;
break;
case 'p':
errno = 0;
tmp = strtol(optarg, &end, 10);
if (errno || *end || tmp < 0 || tmp > 65535) {
if (errno || *end || tmp < 1 || tmp > 65535) {
fprintf(stderr, "endlessh: Invalid port: %s\n", optarg);
exit(EXIT_FAILURE);
}