[src/trunk]: src/external/bsd/blacklist add receiver.

[christos <christos%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/b53acd25a205
branches:  trunk
changeset: 805667:b53acd25a205
user:      christos <christos%NetBSD.org@localhost>
date:      Sun Jan 11 17:56:21 2015 +0000

description:
add receiver.

diffstat:

 external/bsd/blacklist/include/bl.h   |    9 +-
 external/bsd/blacklist/lib/bl.c       |  103 +++++++++++++++++++++++++++++++--
 external/bsd/blacklist/test/srvtest.c |    4 +-
 3 files changed, 103 insertions(+), 13 deletions(-)

diffs (201 lines):

diff -r 77637167e201 -r b53acd25a205 external/bsd/blacklist/include/bl.h
--- a/external/bsd/blacklist/include/bl.h       Sun Jan 11 17:29:57 2015 +0000
+++ b/external/bsd/blacklist/include/bl.h       Sun Jan 11 17:56:21 2015 +0000
@@ -1,13 +1,16 @@
+
+#include <stdbool.h>
 
 typedef enum {
+       BL_INVALID,
        BL_ADD,
-       BL_PING,
 } bl_type_t;
 
 typedef struct blacklist *bl_t;
 
-bl_t bl_create(void);
+bl_t bl_create(bool);
 void bl_destroy(bl_t);
-int bl_add(bl_t, bl_type_t, int, int, const char *ctx);
+int bl_send(bl_t, bl_type_t, int, int, const char *);
+int bl_recv(bl_t, bl_type_t *, int *, int *, char *, size_t);
 
 #define _PATH_BLACKLIST "/tmp/blacklist"
diff -r 77637167e201 -r b53acd25a205 external/bsd/blacklist/lib/bl.c
--- a/external/bsd/blacklist/lib/bl.c   Sun Jan 11 17:29:57 2015 +0000
+++ b/external/bsd/blacklist/lib/bl.c   Sun Jan 11 17:56:21 2015 +0000
@@ -1,3 +1,4 @@
+#include <sys/param.h>
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <sys/un.h>
@@ -7,12 +8,13 @@
 #include <fcntl.h>
 #include <stdlib.h>
 #include <unistd.h>
+#include <stdbool.h>
 
 #include "bl.h"
 #include "internal.h"
 
 static int
-bl_init(bl_t b)
+bl_init(bl_t b, bool srv)
 {
        /* AF_UNIX address of local logger */
        static const struct sockaddr_un sun = {
@@ -33,24 +35,32 @@
        if (b->b_connected)
                return 0;
 
-       if (connect(b->b_fd, (const void *)&sun,
+       if ((srv ? bind : connect)(b->b_fd, (const void *)&sun,
            (socklen_t)sizeof(sun)) == -1) {
-               syslog(LOG_ERR, "%s: connect failed (%m)", __func__);
+               syslog(LOG_ERR, "%s: %s failed (%m)", __func__,
+                   srv ? "bind" : "connect");
                return -1;
        }
-       b->b_connected = 1;
+       b->b_connected = true;
+       if (srv)
+               if (listen(b->b_fd, 5) == -1) {
+                       syslog(LOG_ERR, "%s: listen failed (%m)", __func__);
+                       close(b->b_fd);
+                       b->b_fd = -1;
+                       b->b_connected = false;
+               }
        return 0;
 }
 
 bl_t
-bl_create(void)
+bl_create(bool srv)
 {
        bl_t b = malloc(sizeof(*b));
        if (b == NULL) {
                syslog(LOG_ERR, "%s: malloc failed (%m)", __func__);
                return NULL;
        }
-       bl_init(b);
+       bl_init(b, srv);
        return b;
 }
 
@@ -85,7 +95,7 @@
 #endif
 
 int
-bl_add(bl_t b, bl_type_t e, int lfd, int pfd, const char *ctx)
+bl_send(bl_t b, bl_type_t e, int lfd, int pfd, const char *ctx)
 {
        struct msghdr   msg;
        struct iovec    iov;
@@ -129,8 +139,85 @@
        fd[0] = lfd;
        fd[1] = pfd;
 
-       if (bl_init(b) == -1)
+       if (bl_init(b, false) == -1)
                return -1;
 
        return sendmsg(b->b_fd, &msg, 0);
 }
+
+int
+bl_recv(bl_t b, bl_type_t *e, int *lfd, int *pfd, char *ctx, size_t clen)
+{
+        struct msghdr   msg;
+        struct iovec    iov;
+       union {
+               char ctrl[CMSG_SPACE(2 * sizeof(int))];
+               uint32_t fd[2];
+       } uc;
+       struct cmsghdr *cmsg;
+       union {
+               bl_message_t bl;
+               char buf[512];
+       } ub;
+       int *fd;
+       ssize_t rlen;
+
+       *e = BL_INVALID;
+       *lfd = *pfd = -1;
+       if (clen > 0)
+               *ctx = '\0';
+
+       iov.iov_base = ub.buf;
+       iov.iov_len = sizeof(ub);
+
+       msg.msg_name = NULL;
+       msg.msg_namelen = 0;
+       msg.msg_iov = &iov;
+       msg.msg_iovlen = 1;
+
+       msg.msg_control = uc.ctrl;
+       msg.msg_controllen = sizeof(uc.ctrl);
+
+        rlen = recvmsg(b->b_fd, &msg, 0);
+        if (rlen == -1) {
+               syslog(LOG_ERR, "%s: recvmsg failed (%m)", __func__);
+               return -1;
+        }
+
+       for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
+               if (cmsg->cmsg_level != SOL_SOCKET) {
+                       syslog(LOG_ERR, "%s: unexpected cmsg_level %d",
+                           __func__, cmsg->cmsg_level);
+                       continue;
+               }
+               if (cmsg->cmsg_type != SCM_RIGHTS) {
+                       syslog(LOG_ERR, "%s: unexpected cmsg_type %d",
+                           __func__, cmsg->cmsg_type);
+                       continue;
+               }
+               if (cmsg->cmsg_len == CMSG_LEN(2 * sizeof(int))) {
+                       syslog(LOG_ERR, "%s: unexpected cmsg_len %d != %zu",
+                           __func__, cmsg->cmsg_len,
+                           CMSG_LEN(2 * sizeof(int)));
+                       continue;
+               }
+               fd = (void *)CMSG_DATA(cmsg);
+               *lfd = fd[0];
+               *pfd = fd[1];
+
+       }
+
+       if (rlen <= sizeof(ub.bl)) {
+               syslog(LOG_ERR, "message too short %zd", rlen);
+               return rlen;
+       }
+
+       if (ub.bl.bl_version != BL_VERSION) {
+               syslog(LOG_ERR, "bad version %d", ub.bl.bl_version);
+               return rlen;
+       }
+
+       *e = ub.bl.bl_type;
+       strlcpy(ctx, ub.bl.bl_data, MIN(clen, rlen - sizeof(ub.bl)));
+       return rlen;
+}
diff -r 77637167e201 -r b53acd25a205 external/bsd/blacklist/test/srvtest.c
--- a/external/bsd/blacklist/test/srvtest.c     Sun Jan 11 17:29:57 2015 +0000
+++ b/external/bsd/blacklist/test/srvtest.c     Sun Jan 11 17:56:21 2015 +0000
@@ -22,7 +22,7 @@
        if ((n = read(afd, buffer, sizeof(buffer))) == -1)
                err(1, "read");
        buffer[sizeof(buffer) - 1] = '\0';
-       bl_add(bl, BL_ADD, sfd, afd, buffer);
+       bl_send(bl, BL_ADD, sfd, afd, buffer);
        printf("received %s\n", buffer);
        exit(0);
 }
@@ -51,7 +51,7 @@
        if (listen(sfd, 5) == -1)
                err(1, "listen");
 
-       bl = bl_create();
+       bl = bl_create(false);
 
        for (;;) {
                struct sockaddr_in asin;