nserver/src/ncmd.c


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42

#include <ncmd.h>

int sanitize(char *cmd)
{
    check(cmd != NULL, "cmd is NULL");

    size_t len = strlen(cmd);
    check(len > 0, "cmd empty");

    // strip newline character at the end.
    cmd[len - 1] = '\0';

    return 0;
 error:
    return -1;
}

char *check_cmd(char *cmd)
{
    char *err = NULL;

    check(cmd != NULL, "cmd is NULL");

    int rc = sanitize(cmd);
    check(rc != -1, "sanitize failed");

    size_t len = strlen(cmd);
    if (len >= CMD_MIN_SIZE && len <= CMD_MAX_SIZE) {
        return NULL;
    }

    if (len == 0) {
        err = "closing connection\n";
    } else {
        err = "command size invalid\n";
    }

    return err;
 error:
    err = "internal error\n";
    return err;
}