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This commit is contained in:
Yves Rutschle 2017-04-18 20:53:19 +02:00
parent b0f4e24ce0
commit cce42c6882
1 changed files with 94 additions and 101 deletions
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195
systemd-sslh-generator.c
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@ -5,9 +5,8 @@
static char* resolve_listen(const char *hostname, const char *port) { static char* resolve_listen(const char *hostname, const char *port) {
/* Need room in the strcat for \0 and :
/* Need room in the strcat for \0 and : * the format in the socket unit file is hostname:port */
* the format in the socket unit file is hostname:port */
char *conn = (char*)malloc(strlen(hostname)+strlen(port)+2); char *conn = (char*)malloc(strlen(hostname)+strlen(port)+2);
strcpy(conn, hostname); strcpy(conn, hostname);
strcat(conn, ":"); strcat(conn, ":");
@ -19,135 +18,129 @@ static char* resolve_listen(const char *hostname, const char *port) {
static int get_listen_from_conf(const char *filename, char **listen) { static int get_listen_from_conf(const char *filename, char **listen) {
config_t config;
config_setting_t *setting, *addr;
const char *hostname, *port;
int len = 0;
config_t config; /* look up the listen stanzas in the config file so these
config_setting_t *setting, *addr; * can be used in the socket file generated */
const char *hostname, *port; config_init(&config);
int len = 0; if (config_read_file(&config, filename) == CONFIG_FALSE) {
/* we don't care if file is missing, skip it */
/* look up the listen stanzas in the config file so these if (config_error_line(&config) != 0) {
* can be used in the socket file generated */ fprintf(stderr, "%s:%d:%s\n",
filename,
config_init(&config); config_error_line(&config),
if (config_read_file(&config, filename) == CONFIG_FALSE) { config_error_text(&config));
/* we don't care if file is missing, skip it */
if (config_error_line(&config) != 0) {
fprintf(stderr, "%s:%d:%s\n",
filename,
config_error_line(&config),
config_error_text(&config));
return -1;
}
} else {
setting = config_lookup(&config, "listen");
if (setting) {
len = config_setting_length(setting);
for (int i = 0; i < len; i++) {
addr = config_setting_get_elem(setting, i);
if (! (config_setting_lookup_string(addr, "host", &hostname) &&
config_setting_lookup_string(addr, "port", &port))) {
fprintf(stderr,
"line %d:Incomplete specification (hostname and port required)\n",
config_setting_source_line(addr));
return -1; return -1;
} else {
listen[i] = malloc(strlen(resolve_listen(hostname, port)));
strcpy(listen[i], resolve_listen(hostname, port));
} }
} } else {
setting = config_lookup(&config, "listen");
if (setting) {
len = config_setting_length(setting);
for (int i = 0; i < len; i++) {
addr = config_setting_get_elem(setting, i);
if (! (config_setting_lookup_string(addr, "host", &hostname) &&
config_setting_lookup_string(addr, "port", &port))) {
fprintf(stderr,
"line %d:Incomplete specification (hostname and port required)\n",
config_setting_source_line(addr));
return -1;
} else {
listen[i] = malloc(strlen(resolve_listen(hostname, port)));
strcpy(listen[i], resolve_listen(hostname, port));
}
}
}
} }
}
return len; return len;
} }
static int write_socket_unit(FILE *socket, char **listen, int num_addr, const char *source) { static int write_socket_unit(FILE *socket, char **listen, int num_addr, const char *source) {
fprintf(socket, fprintf(socket,
"# Automatically generated by systemd-sslh-generator\n\n" "# Automatically generated by systemd-sslh-generator\n\n"
"[Unit]\n" "[Unit]\n"
"Before=sslh.service\n" "Before=sslh.service\n"
"SourcePath=%s\n" "SourcePath=%s\n"
"Documentation=man:sslh(8) man:systemd-sslh-generator(8)\n\n" "Documentation=man:sslh(8) man:systemd-sslh-generator(8)\n\n"
"[Socket]\n" "[Socket]\n"
"FreeBind=true\n", "FreeBind=true\n",
source); source);
for (int i = 0; i < num_addr; i++) { for (int i = 0; i < num_addr; i++) {
fprintf(socket, "ListenStream=%s\n", listen[i]); fprintf(socket, "ListenStream=%s\n", listen[i]);
} }
return 0; return 0;
} }
static int gen_sslh_config(char *runtime_unit_dir) { static int gen_sslh_config(char *runtime_unit_dir) {
char *sslh_conf;
int num_addr;
FILE *config;
char **listen;
FILE *runtime_conf_fd = stdout;
const char *unit_file;
char *sslh_conf; /* There are two default locations so check both with first given preference */
int num_addr; sslh_conf = "/etc/sslh.cfg";
FILE *config;
char **listen;
FILE *runtime_conf_fd = stdout;
const char *unit_file;
/* There are two default locations so check both with first given preference */ config = fopen(sslh_conf, "r");
sslh_conf = "/etc/sslh.cfg"; if (config == NULL) {
sslh_conf="/etc/sslh/sslh.cfg";
config = fopen(sslh_conf, "r"); config = fopen(sslh_conf, "r");
if (config == NULL) { if (config == NULL) {
sslh_conf="/etc/sslh/sslh.cfg"; return -1;
config = fopen(sslh_conf, "r"); }
if (config == NULL) {
return -1;
} }
}
fclose(config); fclose(config);
num_addr = get_listen_from_conf(sslh_conf, listen); num_addr = get_listen_from_conf(sslh_conf, listen);
if (num_addr < 0) if (num_addr < 0)
return -1; return -1;
/* If this is run by systemd directly write to the location told to /* If this is run by systemd directly write to the location told to
* otherwise write to standard out so that it's trivial to check what * otherwise write to standard out so that it's trivial to check what
* will be written */ * will be written */
if (runtime_unit_dir != "") { if (runtime_unit_dir != "") {
unit_file = "/sslh.socket"; unit_file = "/sslh.socket";
size_t uf_len = strlen(unit_file); size_t uf_len = strlen(unit_file);
size_t runtime_len = strlen(runtime_unit_dir) + uf_len + 1; size_t runtime_len = strlen(runtime_unit_dir) + uf_len + 1;
char *runtime_conf = malloc(runtime_len); char *runtime_conf = malloc(runtime_len);
strcpy(runtime_conf, runtime_unit_dir); strcpy(runtime_conf, runtime_unit_dir);
strcat(runtime_conf, unit_file); strcat(runtime_conf, unit_file);
runtime_conf_fd = fopen(runtime_conf, "w"); runtime_conf_fd = fopen(runtime_conf, "w");
} }
return write_socket_unit(runtime_conf_fd, listen, num_addr, sslh_conf); return write_socket_unit(runtime_conf_fd, listen, num_addr, sslh_conf);
} }
int main(int argc, char *argv[]){ int main(int argc, char *argv[]){
int r = 0;
int k;
char *runtime_unit_dest = "";
int r = 0; if (argc > 1 && (argc != 4) ) {
int k; printf("This program takes three or no arguments.\n");
char *runtime_unit_dest = ""; return -1;
}
if (argc > 1 && (argc != 4) ) { if (argc > 1)
printf("This program takes three or no arguments.\n"); runtime_unit_dest = argv[1];
return -1;
}
if (argc > 1) k = gen_sslh_config(runtime_unit_dest);
runtime_unit_dest = argv[1]; if (k < 0)
r = k;
k = gen_sslh_config(runtime_unit_dest);
if (k < 0)
r = k;
return r < 0 ? -1 : 0;
return r < 0 ? -1 : 0;
} }