[PATCH] daemon: use strbuf for hostname info
From: René Scharfe <hidden>
Date: 2016-06-15 23:04:00
Convert hostname, canon_hostname, ip_address and tcp_port to strbuf. This allows to get rid of the helpers strbuf_addstr_or_null() and STRARG because a strbuf always represents a valid (initially empty) string. sanitize_client() becomes unused and is removed as well. Signed-off-by: Rene Scharfe <redacted> --- daemon.c | 98 +++++++++++++++++++++++++++------------------------------------- 1 file changed, 41 insertions(+), 57 deletions(-)
diff --git a/daemon.c b/daemon.c
index c3edd96..c04315e 100644
--- a/daemon.c
+++ b/daemon.c@@ -56,10 +56,10 @@ static const char *user_path; static unsigned int timeout; static unsigned int init_timeout; -static char *hostname; -static char *canon_hostname; -static char *ip_address; -static char *tcp_port; +static struct strbuf hostname = STRBUF_INIT; +static struct strbuf canon_hostname = STRBUF_INIT; +static struct strbuf ip_address = STRBUF_INIT; +static struct strbuf tcp_port = STRBUF_INIT; static int hostname_lookup_done;
@@ -68,13 +68,13 @@ static void lookup_hostname(void); static const char *get_canon_hostname(void) { lookup_hostname(); - return canon_hostname; + return canon_hostname.buf; } static const char *get_ip_address(void) { lookup_hostname(); - return ip_address; + return ip_address.buf; } static void logreport(int priority, const char *err, va_list params)
@@ -122,12 +122,6 @@ static void NORETURN daemon_die(const char *err, va_list params) exit(1); } -static void strbuf_addstr_or_null(struct strbuf *sb, const char *s) -{ - if (s) - strbuf_addstr(sb, s); -} - struct expand_path_context { const char *directory; };
@@ -138,22 +132,22 @@ static size_t expand_path(struct strbuf *sb, const char *placeholder, void *ctx) switch (placeholder[0]) { case 'H': - strbuf_addstr_or_null(sb, hostname); + strbuf_addbuf(sb, &hostname); return 1; case 'C': if (placeholder[1] == 'H') { - strbuf_addstr_or_null(sb, get_canon_hostname()); + strbuf_addstr(sb, get_canon_hostname()); return 2; } break; case 'I': if (placeholder[1] == 'P') { - strbuf_addstr_or_null(sb, get_ip_address()); + strbuf_addstr(sb, get_ip_address()); return 2; } break; case 'P': - strbuf_addstr_or_null(sb, tcp_port); + strbuf_addbuf(sb, &tcp_port); return 1; case 'D': strbuf_addstr(sb, context->directory);
@@ -301,16 +295,14 @@ static int run_access_hook(struct daemon_service *service, const char *dir, cons char *eol; int seen_errors = 0; -#define STRARG(x) ((x) ? (x) : "") *arg++ = access_hook; *arg++ = service->name; *arg++ = path; - *arg++ = STRARG(hostname); - *arg++ = STRARG(get_canon_hostname()); - *arg++ = STRARG(get_ip_address()); - *arg++ = STRARG(tcp_port); + *arg++ = hostname.buf; + *arg++ = get_canon_hostname(); + *arg++ = get_ip_address(); + *arg++ = tcp_port.buf; *arg = NULL; -#undef STRARG child.use_shell = 1; child.argv = argv;
@@ -556,23 +548,14 @@ static void sanitize_client_strbuf(struct strbuf *out, const char *in) strbuf_setlen(out, out->len - 1); } -static char *sanitize_client(const char *in) -{ - struct strbuf out = STRBUF_INIT; - sanitize_client_strbuf(&out, in); - return strbuf_detach(&out, NULL); -} - /* - * Like sanitize_client, but we also perform any canonicalization + * Like sanitize_client_strbuf, but we also perform any canonicalization * to make life easier on the admin. */ -static char *canonicalize_client(const char *in) +static void canonicalize_client_strbuf(struct strbuf *out, const char *in) { - struct strbuf out = STRBUF_INIT; - sanitize_client_strbuf(&out, in); - strbuf_tolower(&out); - return strbuf_detach(&out, NULL); + sanitize_client_strbuf(out, in); + strbuf_tolower(out); } /*
@@ -595,11 +578,11 @@ static void parse_host_arg(char *extra_args, int buflen) char *port; parse_host_and_port(val, &host, &port); if (port) { - free(tcp_port); - tcp_port = sanitize_client(port); + strbuf_reset(&tcp_port); + sanitize_client_strbuf(&tcp_port, port); } - free(hostname); - hostname = canonicalize_client(host); + strbuf_reset(&hostname); + canonicalize_client_strbuf(&hostname, host); hostname_lookup_done = 0; }
@@ -616,7 +599,7 @@ static void parse_host_arg(char *extra_args, int buflen) */ static void lookup_hostname(void) { - if (!hostname_lookup_done && hostname) { + if (!hostname_lookup_done && hostname.len) { #ifndef NO_IPV6 struct addrinfo hints; struct addrinfo *ai;
@@ -626,19 +609,21 @@ static void lookup_hostname(void) memset(&hints, 0, sizeof(hints)); hints.ai_flags = AI_CANONNAME; - gai = getaddrinfo(hostname, NULL, &hints, &ai); + gai = getaddrinfo(hostname.buf, NULL, &hints, &ai); if (!gai) { struct sockaddr_in *sin_addr = (void *)ai->ai_addr; inet_ntop(AF_INET, &sin_addr->sin_addr, addrbuf, sizeof(addrbuf)); - free(ip_address); - ip_address = xstrdup(addrbuf); + strbuf_reset(&ip_address); + strbuf_addstr(&ip_address, addrbuf); - free(canon_hostname); - canon_hostname = ai->ai_canonname ? - sanitize_client(ai->ai_canonname) : - xstrdup(ip_address); + strbuf_reset(&canon_hostname); + if (ai->ai_canonname) + sanitize_client_strbuf(&canon_hostname, + ai->ai_canonname); + else + strbuf_addbuf(&canon_hostname, &ip_address); freeaddrinfo(ai); }
@@ -648,7 +633,7 @@ static void lookup_hostname(void) char **ap; static char addrbuf[HOST_NAME_MAX + 1]; - hent = gethostbyname(hostname); + hent = gethostbyname(hostname.buf); if (hent) { ap = hent->h_addr_list; memset(&sa, 0, sizeof sa);
@@ -659,10 +644,10 @@ static void lookup_hostname(void) inet_ntop(hent->h_addrtype, &sa.sin_addr, addrbuf, sizeof(addrbuf)); - free(canon_hostname); - canon_hostname = sanitize_client(hent->h_name); - free(ip_address); - ip_address = xstrdup(addrbuf); + strbuf_reset(&canon_hostname); + sanitize_client_strbuf(&canon_hostname, hent->h_name); + strbuf_reset(&ip_address); + strbuf_addstr(&ip_address, addrbuf); } #endif hostname_lookup_done = 1;
@@ -693,11 +678,10 @@ static int execute(void) pktlen--; } - free(hostname); - free(canon_hostname); - free(ip_address); - free(tcp_port); - hostname = canon_hostname = ip_address = tcp_port = NULL; + strbuf_reset(&hostname); + strbuf_reset(&canon_hostname); + strbuf_reset(&ip_address); + strbuf_reset(&tcp_port); if (len != pktlen) parse_host_arg(line + len + 1, pktlen - len - 1);
--
2.3.1