From 4c1a2d24d374d00c656c4489db7d28f80d64f9dc Mon Sep 17 00:00:00 2001
From: shtrophic
Date: Mon, 20 Jan 2025 22:59:30 +0100
Subject: add port parsing for sandboxing

---
 utils.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)

(limited to 'utils.c')

diff --git a/utils.c b/utils.c
index a5b1124..3b0a78f 100644
--- a/utils.c
+++ b/utils.c
@@ -904,3 +904,55 @@ void import_csv(snac *user)
     else
         snac_log(user, xs_fmt("Cannot open file %s", fn));
 }
+
+static const struct {
+	const char *proto;
+	unsigned short default_port;
+} FALLBACK_PORTS[] = {
+	/* caution: https > http, smpts > smtp */
+	{"https", 443},
+	{"http",  80},
+    {"smtps", 465},
+	{"smtp", 25}
+};
+
+int parse_port(const char *url, const char **errstr)
+{
+	const char *col, *rcol;
+	int tmp, ret = -1;
+
+    if (errstr)
+	    *errstr = NULL;
+
+	if (!(col = strchr(url, ':'))) {
+        if (errstr)
+		    *errstr = "bad url";
+		return -1;
+	}
+	
+	for (size_t i = 0; i < sizeof(FALLBACK_PORTS) / sizeof(*FALLBACK_PORTS); ++i) {
+		if (memcmp(url, FALLBACK_PORTS[i].proto, strlen(FALLBACK_PORTS[i].proto)) == 0) {
+			ret = FALLBACK_PORTS[i].default_port;
+			break;
+		}
+	}
+
+	if (!(rcol = strchr(col + 1, ':')))
+		rcol = col;
+
+	if (rcol) {
+		tmp = atoi(rcol + 1);
+        if (tmp == 0) {
+            if (ret != -1) 
+                return ret;
+            
+            *errstr = strerror(errno);
+            return -1;
+        }
+		
+		return tmp;
+	}
+
+	*errstr = "unknown protocol";
+	return -1;
+}
-- 
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