lib: Added environment-variable expansion for stdchild arguments.

diff --git a/lib/cf.c b/lib/cf.c
index 2ca910a..47db8c2 100644 (file)
--- a/lib/cf.c
+++ b/lib/cf.c
@@ -309,10 +309,56 @@ static struct chandler stdhandler = {
     .destroy = stddestroy,
 };
 
+static char **expandargs(struct stdchild *sd)
+{
+    int i;
+    char **ret, *p, *p2, *p3, *np, *env;
+    struct charbuf exp;
+    
+    ret = szmalloc(sizeof(*ret) * (calen(sd->argv) + 1));
+    bufinit(exp);
+    for(i = 0; sd->argv[i] != NULL; i++) {
+       if((p = strchr(sd->argv[i], '$')) == NULL) {
+           ret[i] = sstrdup(sd->argv[i]);
+       } else {
+           exp.d = 0;
+           for(p2 = sd->argv[i]; p != NULL; p2 = np, p = strchr(np, '$')) {
+               bufcat(exp, p2, p - p2);
+               if(p[1] == '{') {
+                   if((p3 = strchr((p += 2), '}')) == NULL)
+                       break;
+                   np = p3 + 1;
+               } else {
+                   for(p3 = ++p; *p3; p3++) {
+                       if(!(((*p3 >= 'a') && (*p3 <= 'z')) ||
+                            ((*p3 >= 'A') && (*p3 <= 'Z')) ||
+                            ((*p3 >= '0') && (*p3 <= '9')) ||
+                            (*p3 == '_'))) {
+                           break;
+                       }
+                   }
+                   np = p3;
+               }
+               char temp[(p3 - p) + 1];
+               memcpy(temp, p, p3 - p);
+               temp[p3 - p] = 0;
+               if((env = getenv(temp)) != NULL)
+                   bufcatstr(exp, env);
+           }
+           bufcatstr2(exp, np);
+           ret[i] = sstrdup(exp.b);
+       }
+    }
+    ret[i] = NULL;
+    buffree(exp);
+    return(ret);
+}
+
 static int stdhandle(struct child *ch, struct hthead *req, int fd, void (*chinit)(void *), void *idata)
 {
     struct stdchild *sd = ch->pdata;
     int serr;
+    char **args;
     
     void stdinit(void *data)
     {
@@ -325,14 +371,19 @@ static int stdhandle(struct child *ch, struct hthead *req, int fd, void (*chinit
     }
     
     if(sd->type == CH_SOCKET) {
-       if(sd->fd < 0)
-           sd->fd = stdmkchild(sd->argv, stdinit, idata);
+       if(sd->fd < 0) {
+           args = expandargs(sd);
+           sd->fd = stdmkchild(args, stdinit, idata);
+           freeca(args);
+       }
        if(sendreq2(sd->fd, req, fd, MSG_NOSIGNAL | MSG_DONTWAIT)) {
            serr = errno;
            if((serr == EPIPE) || (serr == ECONNRESET)) {
                /* Assume that the child has crashed and restart it. */
                close(sd->fd);
-               sd->fd = stdmkchild(sd->argv, stdinit, idata);
+               args = expandargs(sd);
+               sd->fd = stdmkchild(args, stdinit, idata);
+               freeca(args);
                if(!sendreq2(sd->fd, req, fd, MSG_NOSIGNAL | MSG_DONTWAIT))
                    return(0);
            }
@@ -344,8 +395,12 @@ static int stdhandle(struct child *ch, struct hthead *req, int fd, void (*chinit
            return(-1);
        }
     } else if(sd->type == CH_FORK) {
-       if(stdforkserve(sd->argv, req, fd, chinit, idata) < 0)
+       args = expandargs(sd);
+       if(stdforkserve(args, req, fd, chinit, idata) < 0) {
+           freeca(args);
            return(-1);
+       }
+       freeca(args);
     }
     return(0);
 }