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authorIsaac Boukris <iboukris@gmail.com>2017-01-09 00:51:08 +0200
committerPeter Wu <peter@lekensteyn.nl>2017-01-13 16:25:20 +0100
commit1d786faee1046ff90e71252aeef4a997c3bf0d8d (patch)
tree325ebddb13f12be61a28062c2f06980e2a34754a /lib
parenta7c73ae309c03bd84b28659421ac613e503565ce (diff)
unix_socket: add support for abstract unix domain socket
In addition to unix domain sockets, Linux also supports an abstract namespace which is independent of the filesystem. In order to support it, add new CURLOPT_ABSTRACT_UNIX_SOCKET option which uses the same storage as CURLOPT_UNIX_SOCKET_PATH internally, along with a flag to specify abstract socket. On non-supporting platforms, the abstract address will be interpreted as an empty string and fail gracefully. Also add new --abstract-unix-socket tool parameter. Signed-off-by: Isaac Boukris <iboukris@gmail.com> Reported-by: Chungtsun Li (typeless) Reviewed-by: Daniel Stenberg Reviewed-by: Peter Wu Closes #1197 Fixes #1061
Diffstat (limited to 'lib')
-rw-r--r--lib/curl_addrinfo.c27
-rw-r--r--lib/curl_addrinfo.h2
-rw-r--r--lib/url.c14
-rw-r--r--lib/urldata.h3
4 files changed, 35 insertions, 11 deletions
diff --git a/lib/curl_addrinfo.c b/lib/curl_addrinfo.c
index 61cdaddc1..7182a0066 100644
--- a/lib/curl_addrinfo.c
+++ b/lib/curl_addrinfo.c
@@ -47,6 +47,8 @@
# define in_addr_t unsigned long
#endif
+#include <stddef.h>
+
#include "curl_addrinfo.h"
#include "inet_pton.h"
#include "warnless.h"
@@ -483,24 +485,29 @@ Curl_addrinfo *Curl_str2addr(char *address, int port)
* struct initialized with this path.
* Set '*longpath' to TRUE if the error is a too long path.
*/
-Curl_addrinfo *Curl_unix2addr(const char *path, int *longpath)
+Curl_addrinfo *Curl_unix2addr(const char *path, bool *longpath, bool abstract)
{
Curl_addrinfo *ai;
struct sockaddr_un *sa_un;
size_t path_len;
+ *longpath = FALSE;
+
ai = calloc(1, sizeof(Curl_addrinfo));
if(!ai)
return NULL;
ai->ai_addr = calloc(1, sizeof(struct sockaddr_un));
if(!ai->ai_addr) {
free(ai);
- *longpath = FALSE;
return NULL;
}
+
+ sa_un = (void *) ai->ai_addr;
+ sa_un->sun_family = AF_UNIX;
+
/* sun_path must be able to store the NUL-terminated path */
- path_len = strlen(path);
- if(path_len >= sizeof(sa_un->sun_path)) {
+ path_len = strlen(path) + 1;
+ if(path_len > sizeof(sa_un->sun_path)) {
free(ai->ai_addr);
free(ai);
*longpath = TRUE;
@@ -509,10 +516,14 @@ Curl_addrinfo *Curl_unix2addr(const char *path, int *longpath)
ai->ai_family = AF_UNIX;
ai->ai_socktype = SOCK_STREAM; /* assume reliable transport for HTTP */
- ai->ai_addrlen = (curl_socklen_t) sizeof(struct sockaddr_un);
- sa_un = (void *) ai->ai_addr;
- sa_un->sun_family = AF_UNIX;
- memcpy(sa_un->sun_path, path, path_len + 1); /* copy NUL byte */
+ ai->ai_addrlen = offsetof(struct sockaddr_un, sun_path) + path_len;
+
+ /* Abstract Unix domain socket have NULL prefix instead of suffix */
+ if(abstract)
+ memcpy(sa_un->sun_path + 1, path, path_len - 1);
+ else
+ memcpy(sa_un->sun_path, path, path_len); /* copy NUL byte */
+
return ai;
}
#endif
diff --git a/lib/curl_addrinfo.h b/lib/curl_addrinfo.h
index 4f24730af..8f6f3d106 100644
--- a/lib/curl_addrinfo.h
+++ b/lib/curl_addrinfo.h
@@ -80,7 +80,7 @@ Curl_ip2addr(int af, const void *inaddr, const char *hostname, int port);
Curl_addrinfo *Curl_str2addr(char *dotted, int port);
#ifdef USE_UNIX_SOCKETS
-Curl_addrinfo *Curl_unix2addr(const char *path, int *longpath);
+Curl_addrinfo *Curl_unix2addr(const char *path, bool *longpath, bool abstract);
#endif
#if defined(CURLDEBUG) && defined(HAVE_GETADDRINFO) && \
diff --git a/lib/url.c b/lib/url.c
index 074289ed4..edae1e3f3 100644
--- a/lib/url.c
+++ b/lib/url.c
@@ -2814,6 +2814,12 @@ CURLcode Curl_setopt(struct Curl_easy *data, CURLoption option,
#ifdef USE_UNIX_SOCKETS
case CURLOPT_UNIX_SOCKET_PATH:
+ data->set.abstract_unix_socket = FALSE;
+ result = setstropt(&data->set.str[STRING_UNIX_SOCKET_PATH],
+ va_arg(param, char *));
+ break;
+ case CURLOPT_ABSTRACT_UNIX_SOCKET:
+ data->set.abstract_unix_socket = TRUE;
result = setstropt(&data->set.str[STRING_UNIX_SOCKET_PATH],
va_arg(param, char *));
break;
@@ -3523,6 +3529,8 @@ ConnectionExists(struct Curl_easy *data,
continue;
if(strcmp(needle->unix_domain_socket, check->unix_domain_socket))
continue;
+ if(needle->abstract_unix_socket != check->abstract_unix_socket)
+ continue;
}
else if(check->unix_domain_socket)
continue;
@@ -5863,8 +5871,9 @@ static CURLcode resolve_server(struct Curl_easy *data,
if(!hostaddr)
result = CURLE_OUT_OF_MEMORY;
else {
- int longpath=0;
- hostaddr->addr = Curl_unix2addr(path, &longpath);
+ bool longpath = FALSE;
+ hostaddr->addr = Curl_unix2addr(path, &longpath,
+ conn->abstract_unix_socket);
if(hostaddr->addr)
hostaddr->inuse++;
else {
@@ -6273,6 +6282,7 @@ static CURLcode create_conn(struct Curl_easy *data,
result = CURLE_OUT_OF_MEMORY;
goto out;
}
+ conn->abstract_unix_socket = data->set.abstract_unix_socket;
}
#endif
diff --git a/lib/urldata.h b/lib/urldata.h
index 0271d266b..96c0aca19 100644
--- a/lib/urldata.h
+++ b/lib/urldata.h
@@ -1133,6 +1133,7 @@ struct connectdata {
#ifdef USE_UNIX_SOCKETS
char *unix_domain_socket;
+ bool abstract_unix_socket;
#endif
};
@@ -1754,6 +1755,8 @@ struct UserDefined {
int stream_weight;
struct Curl_http2_dep *stream_dependents;
+
+ bool abstract_unix_socket;
};
struct Names {