Cocoa/CoreFoundation STARTTLS

NSInputStream *input;
NSOutputStream *output;
[NSStream getStreamsToHost:[NSHost hostWithName:@"smtp.gmail.com"] port:587 inputStream:&input outputStream:&output];
[input open];
[output open];
char line[LINE_MAX];
uint8_t *buf = (uint8_t *)line;
line[[input read:buf maxLength:LINE_MAX] + 1] = 0;
NSLog(@"%s",line);
strncpy(line, "EHLO\r\n", LINE_MAX);
[output write:buf maxLength:strlen(line)];
line[[input read:buf maxLength:LINE_MAX] + 1] = 0;
NSLog(@"%s",line);
strncpy(line, "STARTTLS\r\n", LINE_MAX);
[output write:buf maxLength:strlen(line)];
line[[input read:buf maxLength:LINE_MAX] + 1] = 0;
NSLog(@"%s",line);
NSDictionary *d = @{(__bridge NSString *)kCFStreamSSLPeerName:@"smtp.gmail.com", (__bridge NSString *)kCFStreamSSLLevel:(__bridge NSString *)kCFStreamSocketSecurityLevelNegotiatedSSL};
[input setProperty:d forKey:(__bridge NSString *)kCFStreamPropertySSLSettings];
[output setProperty:d forKey:(__bridge NSString *)kCFStreamPropertySSLSettings];
[input open];
[output open];
strncpy(line, "EHLO\r\n", LINE_MAX);
[output write:buf maxLength:strlen(line)];
line[[input read:buf maxLength:LINE_MAX] + 1] = 0;
NSLog(@"%s",line);