Merge pull request #7844 from mpg/ssl-progs-usage

Fix usage & error reporting in SSL programs

programs/ssl/ssl_client2.c

@@ -469,7 +469,7 @@ int main(void)
     "                                otherwise. The expansion of the macro\n" \
     "                                is printed if it is defined\n"           \
     USAGE_SERIALIZATION                                                       \
-    " acceptable ciphersuite names:\n"
+    "\n"
 
 /*
  * global options
@@ -864,31 +864,6 @@ int main(int argc, char *argv[])
     mbedtls_test_enable_insecure_external_rng();
 #endif  /* MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG */
 
-    if (argc < 2) {
-usage:
-        if (ret == 0) {
-            ret = 1;
-        }
-
-        mbedtls_printf(USAGE1);
-        mbedtls_printf(USAGE2);
-        mbedtls_printf(USAGE3);
-        mbedtls_printf(USAGE4);
-
-        list = mbedtls_ssl_list_ciphersuites();
-        while (*list) {
-            mbedtls_printf(" %-42s", mbedtls_ssl_get_ciphersuite_name(*list));
-            list++;
-            if (!*list) {
-                break;
-            }
-            mbedtls_printf(" %s\n", mbedtls_ssl_get_ciphersuite_name(*list));
-            list++;
-        }
-        mbedtls_printf("\n");
-        goto exit;
-    }
-
     opt.server_name         = DFL_SERVER_NAME;
     opt.server_addr         = DFL_SERVER_ADDR;
     opt.server_port         = DFL_SERVER_PORT;
@@ -973,9 +948,54 @@ usage:
     opt.key_opaque_alg1     = DFL_KEY_OPAQUE_ALG;
     opt.key_opaque_alg2     = DFL_KEY_OPAQUE_ALG;
 
+    p = q = NULL;
+    if (argc < 1) {
+usage:
+        if (p != NULL && q != NULL) {
+            printf("unrecognized value for '%s': '%s'\n", p, q);
+        } else if (p != NULL && q == NULL) {
+            printf("unrecognized param: '%s'\n", p);
+        }
+
+        mbedtls_printf("usage: ssl_client2 [param=value] [...]\n");
+        mbedtls_printf("       ssl_client2 help[_theme]\n");
+        mbedtls_printf("'help' lists acceptable 'param' and 'value'\n");
+        mbedtls_printf("'help_ciphersuites' lists available ciphersuites\n");
+        mbedtls_printf("\n");
+
+        if (ret == 0) {
+            ret = 1;
+        }
+        goto exit;
+    }
+
     for (i = 1; i < argc; i++) {
         p = argv[i];
+
+        if (strcmp(p, "help") == 0) {
+            mbedtls_printf(USAGE1);
+            mbedtls_printf(USAGE2);
+            mbedtls_printf(USAGE3);
+            mbedtls_printf(USAGE4);
+
+            ret = 0;
+            goto exit;
+        }
+        if (strcmp(p, "help_ciphersuites") == 0) {
+            mbedtls_printf(" acceptable ciphersuite names:\n");
+            for (list = mbedtls_ssl_list_ciphersuites();
+                 *list != 0;
+                 list++) {
+                mbedtls_printf(" %s\n", mbedtls_ssl_get_ciphersuite_name(*list));
+            }
+
+            ret = 0;
+            goto exit;
+        }
+
         if ((q = strchr(p, '=')) == NULL) {
+            mbedtls_printf("param requires a value: '%s'\n", p);
+            p = NULL; // avoid "unrecnognized param" message
             goto usage;
         }
         *q++ = '\0';
@@ -1372,9 +1392,13 @@ usage:
                 goto usage;
             }
         } else {
+            /* This signals that the problem is with p not q */
+            q = NULL;
             goto usage;
         }
     }
+    /* This signals that any further errors are not with a single option */
+    p = q = NULL;
 
     if (opt.nss_keylog != 0 && opt.eap_tls != 0) {
         mbedtls_printf("Error: eap_tls and nss_keylog options cannot be used together.\n");

programs/ssl/ssl_server2.c

@@ -590,7 +590,7 @@ int main(void)
     "                                otherwise. The expansion of the macro\n" \
     "                                is printed if it is defined\n"           \
     USAGE_SERIALIZATION                                                       \
-    " acceptable ciphersuite names:\n"
+    "\n"
 
 #define PUT_UINT64_BE(out_be, in_le, i)                                   \
     {                                                                       \
@@ -1642,31 +1642,6 @@ int main(int argc, char *argv[])
     signal(SIGINT, term_handler);
 #endif
 
-    if (argc < 2) {
-usage:
-        if (ret == 0) {
-            ret = 1;
-        }
-
-        mbedtls_printf(USAGE1);
-        mbedtls_printf(USAGE2);
-        mbedtls_printf(USAGE3);
-        mbedtls_printf(USAGE4);
-
-        list = mbedtls_ssl_list_ciphersuites();
-        while (*list) {
-            mbedtls_printf(" %-42s", mbedtls_ssl_get_ciphersuite_name(*list));
-            list++;
-            if (!*list) {
-                break;
-            }
-            mbedtls_printf(" %s\n", mbedtls_ssl_get_ciphersuite_name(*list));
-            list++;
-        }
-        mbedtls_printf("\n");
-        goto exit;
-    }
-
     opt.buffer_size         = DFL_IO_BUF_LEN;
     opt.server_addr         = DFL_SERVER_ADDR;
     opt.server_port         = DFL_SERVER_PORT;
@@ -1765,9 +1740,54 @@ usage:
     opt.key2_opaque_alg1   = DFL_KEY_OPAQUE_ALG;
     opt.key2_opaque_alg2   = DFL_KEY_OPAQUE_ALG;
 
+    p = q = NULL;
+    if (argc < 1) {
+usage:
+        if (p != NULL && q != NULL) {
+            printf("unrecognized value for '%s': '%s'\n", p, q);
+        } else if (p != NULL && q == NULL) {
+            printf("unrecognized param: '%s'\n", p);
+        }
+
+        mbedtls_printf("usage: ssl_client2 [param=value] [...]\n");
+        mbedtls_printf("       ssl_client2 help[_theme]\n");
+        mbedtls_printf("'help' lists acceptable 'param' and 'value'\n");
+        mbedtls_printf("'help_ciphersuites' lists available ciphersuites\n");
+        mbedtls_printf("\n");
+
+        if (ret == 0) {
+            ret = 1;
+        }
+        goto exit;
+    }
+
     for (i = 1; i < argc; i++) {
         p = argv[i];
+
+        if (strcmp(p, "help") == 0) {
+            mbedtls_printf(USAGE1);
+            mbedtls_printf(USAGE2);
+            mbedtls_printf(USAGE3);
+            mbedtls_printf(USAGE4);
+
+            ret = 0;
+            goto exit;
+        }
+        if (strcmp(p, "help_ciphersuites") == 0) {
+            mbedtls_printf(" acceptable ciphersuite names:\n");
+            for (list = mbedtls_ssl_list_ciphersuites();
+                 *list != 0;
+                 list++) {
+                mbedtls_printf(" %s\n", mbedtls_ssl_get_ciphersuite_name(*list));
+            }
+
+            ret = 0;
+            goto exit;
+        }
+
         if ((q = strchr(p, '=')) == NULL) {
+            mbedtls_printf("param requires a value: '%s'\n", p);
+            p = NULL; // avoid "unrecnognized param" message
             goto usage;
         }
         *q++ = '\0';
@@ -2232,9 +2252,13 @@ usage:
                 goto usage;
             }
         } else {
+            /* This signals that the problem is with p not q */
+            q = NULL;
             goto usage;
         }
     }
+    /* This signals that any further erorrs are not with a single option */
+    p = q = NULL;
 
     if (opt.nss_keylog != 0 && opt.eap_tls != 0) {
         mbedtls_printf("Error: eap_tls and nss_keylog options cannot be used together.\n");