hss_parse_services / hss_parse_config

Source: hss-ports.h:39 and hss-ports.h:58

Builds the candidate port list from /etc/services and the user's ~/.config/.hssrc config file.

hss_parse_services

static void hss_parse_services(struct hss_port_entry *e, int *n);

Reads /etc/services, the system-wide service database, and adds matching ports to the list via hss_add_entry.

Parsing

FILE *f = fopen("/etc/services", "r");
while (fgets(line, sizeof(line), f)) {
    if (line[0] == '#' || line[0] == '\n') continue;
    end = -1;
    if (sscanf(line, "%63s %d-%d/%15s", name, &start, &end, proto) < 4 &&
        scanf(line, "%63s %d/%15s", name, &start, proto) != 3) continue;

Skip comments and blank lines.
Accept two formats: name start-end/proto (range) and name start/proto (single port).
If the first sscanf matches fewer than 4 fields, try the single-port form. If neither matches, skip the line.

Range handling

if (end < 0) end = start;
if (end - start + 1 > 20) end = start + 19;
for (int p = start; p <= end; p++)
    if (p > 0 && p < 65536 && hss_is_common_port(p))
        hss_add_entry(e, n, p, name);

If the entry was a single port, end == start.
Ranges longer than 20 ports are capped (start + 19) to avoid adding huge blocks of ephemeral ports.
Only ports passing hss_is_common_port() are added — that function (hss-ports.h:20) accepts ports 1–1023 and the curated modern-port list (8080, 8443, 3000, 5000, etc.).

IPv6 skip

if (strstr(proto, "6")) continue;

Entries whose protocol contains "6" (e.g., tcp6) are skipped. The tool only probes IPv4 (AF_INET) because hss_get_eth_ips enumerates IPv4 addresses only.

hss_parse_config

static void hss_parse_config(const char *path, struct hss_port_entry *e, int *n);

Reads a user config file (default: ~/.config/.hssrc) and adds ports.

Path expansion

if (path[0] == '~') {
    if (!getenv("HOME")) return;
    snprintf(expanded, sizeof(expanded), "%s%s", getenv("HOME"), path + 1);
    path = expanded;
}

If the path starts with ~, expand it using $HOME. If HOME is unset, skip silently.

Parsing

while (fgets(line, sizeof(line), f)) {
    if (line[0] == '#' || line[0] == '\n') continue;
    int port = atoi(line);
    if (port > 0 && port < 65536) hss_add_entry(e, n, port, NULL);
}

Skip comments and blank lines.
Convert each line to an integer with atoi.
Valid ports (1–65535) are added with NULL name (displayed as the port number).

The config file is line-based — one port per line:

# extra ports to scan
9090
5432
3306

Call order

In hss.c, the sources are loaded in priority order:

hss_parse_services — system-wide common ports.
Built-in modern-port list (hss_modern_ports) — hardcoded in hss-ports.h:11.
hss_parse_config — user overrides.

Because hss_add_entry deduplicates, the same port appearing in multiple sources is only probed once.

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hss_parse_services / hss_parse_config