#2

1 files changed, 132 insertions, 0 deletions

diff --git a/plugins/ssh/ssh_config.c b/plugins/ssh/ssh_config.c
new file mode 100644
index 0000000..77fb7db
--- /dev/null
+++ b/plugins/ssh/ssh_config.c
@@ -0,0 +1,132 @@
+#include "hybbx/ssh.h"
+#include "hybbx/util.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+static unsigned int parse_port(const char *value)
+{
+    char *end;
+    unsigned long port;
+
+    if (value == NULL || value[0] == '\0') {
+        return HYBBX_SSH_DEFAULT_PORT;
+    }
+
+    port = strtoul(value, &end, 10);
+    if (end == value || *end != '\0' || port == 0 || port > 65535u) {
+        return HYBBX_SSH_DEFAULT_PORT;
+    }
+
+    return (unsigned int)port;
+}
+
+static const char *find_kv(const char *config, const char *key,
+                           char *scratch, size_t scratch_len)
+{
+    const char *cursor = config;
+    size_t key_len = strlen(key);
+
+    if (config == NULL || key == NULL) {
+        return NULL;
+    }
+
+    while (*cursor != '\0') {
+        const char *sep = strchr(cursor, ';');
+        const char *end = sep != NULL ? sep : cursor + strlen(cursor);
+        const char *eq = strchr(cursor, '=');
+
+        if (eq != NULL && eq < end && (size_t)(eq - cursor) == key_len &&
+            strncmp(cursor, key, key_len) == 0) {
+            const char *value = eq + 1;
+            size_t value_len = (size_t)(end - value);
+
+            if (scratch != NULL && scratch_len > 0) {
+                if (value_len >= scratch_len) {
+                    value_len = scratch_len - 1;
+                }
+                memcpy(scratch, value, value_len);
+                scratch[value_len] = '\0';
+                return scratch;
+            }
+
+            return value;
+        }
+
+        if (sep == NULL) {
+            break;
+        }
+        cursor = sep + 1;
+    }
+
+    return NULL;
+}
+
+void hybbx_ssh_config_defaults(hybbx_ssh_config_t *config)
+{
+    if (config == NULL) {
+        return;
+    }
+
+    memset(config, 0, sizeof(*config));
+    hybbx_strlcpy(config->bind_v4, HYBBX_SSH_DEFAULT_BIND_V4,
+                  sizeof(config->bind_v4));
+    hybbx_strlcpy(config->bind_v6, HYBBX_SSH_DEFAULT_BIND_V6,
+                  sizeof(config->bind_v6));
+    hybbx_strlcpy(config->hostkey_dir, HYBBX_SSH_DEFAULT_HOSTKEY_DIR,
+                  sizeof(config->hostkey_dir));
+    config->port = HYBBX_SSH_DEFAULT_PORT;
+    config->ipv4 = 1;
+    config->ipv6 = 1;
+}
+
+hybbx_result_t hybbx_ssh_config_parse(const char *config,
+                                      hybbx_ssh_config_t *out)
+{
+    char scratch[HYBBX_SSH_BIND_V6_MAX];
+    const char *value;
+
+    if (out == NULL) {
+        return HYBBX_ERR_INVALID;
+    }
+
+    hybbx_ssh_config_defaults(out);
+
+    if (config == NULL || config[0] == '\0') {
+        return HYBBX_OK;
+    }
+
+    value = find_kv(config, "port", scratch, sizeof(scratch));
+    out->port = parse_port(value);
+
+    value = find_kv(config, "bind", scratch, sizeof(scratch));
+    if (value != NULL && value[0] != '\0') {
+        if (strchr(value, ':') != NULL) {
+            hybbx_strlcpy(out->bind_v6, value, sizeof(out->bind_v6));
+        } else {
+            hybbx_strlcpy(out->bind_v4, value, sizeof(out->bind_v4));
+        }
+    }
+
+    value = find_kv(config, "bind6", scratch, sizeof(scratch));
+    if (value != NULL && value[0] != '\0') {
+        hybbx_strlcpy(out->bind_v6, value, sizeof(out->bind_v6));
+    }
+
+    value = find_kv(config, "hostkey_dir", scratch, sizeof(scratch));
+    if (value != NULL && value[0] != '\0') {
+        hybbx_strlcpy(out->hostkey_dir, value, sizeof(out->hostkey_dir));
+    }
+
+    value = find_kv(config, "ipv4", scratch, sizeof(scratch));
+    if (value != NULL) {
+        out->ipv4 = hybbx_parse_bool(value, 1);
+    }
+
+    value = find_kv(config, "ipv6", scratch, sizeof(scratch));
+    if (value != NULL) {
+        out->ipv6 = hybbx_parse_bool(value, 1);
+    }
+
+    return HYBBX_OK;
+}