cleanup: Replace a few calls to malloc/realloc with safe_malloc

[secnet.git] / util.c

diff --git a/util.c b/util.c
index 426fc69c1a9e922931c52c23d88377dbcf743f1d..3ae5ff4612447e4388a31e2222ac2340c6327cbb 100644 (file)
--- a/util.c
+++ b/util.c
@@ -40,6 +40,7 @@
 #include "util.h"
 #include "unaligned.h"
 #include "magic.h"
+#include "ipaddr.h"
 
 #define MIN_BUFFER_SIZE 64
 #define DEFAULT_BUFFER_SIZE 4096
@@ -70,17 +71,30 @@ char *safe_strdup(const char *s, const char *message)
 void *safe_malloc(size_t size, const char *message)
 {
     void *r;
+    if (!size)
+       return 0;
     r=malloc(size);
     if (!r) {
        fatal_perror("%s",message);
     }
     return r;
 }
-void *safe_malloc_ary(size_t size, size_t count, const char *message) {
+void *safe_realloc_ary(void *p, size_t size, size_t count,
+                      const char *message) {
     if (count >= INT_MAX/size) {
        fatal("array allocation overflow: %s", message);
     }
-    return safe_malloc(size*count, message);
+    assert(size && count);
+    p = realloc(p, size*count);
+    if (!p)
+       fatal_perror("%s", message);
+    return p;
+}
+
+void *safe_malloc_ary(size_t size, size_t count, const char *message) {
+    if (!size || !count)
+       return 0;
+    return safe_realloc_ary(0,size,count,message);
 }
 
 /* Convert a buffer into its MP_INT representation */
@@ -163,13 +177,17 @@ int32_t write_mpbin(MP_INT *a, uint8_t *buffer, int32_t buflen)
     return i;
 }
 
-void setcloexec(int fd) {
-    int r=fcntl(fd, F_GETFD);
-    if (r<0) fatal_perror("fcntl(,F_GETFD) failed");
-    r=fcntl(fd, F_SETFD, r|FD_CLOEXEC);
-    if (r<0) fatal_perror("fcntl(,F_SETFD,|FD_CLOEXEC) failed");
+#define DEFINE_SETFDFLAG(fn,FL,FLAG)                                   \
+void fn(int fd) {                                                      \
+    int r=fcntl(fd, F_GET##FL);                                                \
+    if (r<0) fatal_perror("fcntl(,F_GET" #FL ") failed");              \
+    r=fcntl(fd, F_SET##FL, r|FLAG);                                    \
+    if (r<0) fatal_perror("fcntl(,F_SET" #FL ",|" #FLAG ") failed");   \
 }
 
+DEFINE_SETFDFLAG(setcloexec,FD,FD_CLOEXEC);
+DEFINE_SETFDFLAG(setnonblock,FL,O_NONBLOCK);
+
 void pipe_cloexec(int fd[2]) {
     int r=pipe(fd);
     if (r) fatal_perror("pipe");
@@ -478,6 +496,29 @@ extern void slilog_part(struct log_if *lf, int priority, const char *message, ..
     va_end(ap);
 }
 
+void string_item_to_iaddr(const item_t *item, uint16_t port, union iaddr *ia,
+                         const char *desc)
+{
+#ifndef CONFIG_IPV6
+
+    ia->sin.sin_family=AF_INET;
+    ia->sin.sin_addr.s_addr=string_item_to_ipaddr(item,desc);
+
+#else /* CONFIG_IPV6 => we have adns_text2addr */
+
+    if (item->type!=t_string)
+       cfgfatal(item->loc,desc,"expecting a string IP (v4 or v6) address\n");
+    socklen_t salen=sizeof(*ia);
+    int r=adns_text2addr(item->data.string, port,
+                        adns_qf_addrlit_ipv4_quadonly,
+                        &ia->sa, &salen);
+    assert(r!=ENOSPC);
+    if (r) cfgfatal(item->loc,desc,"invalid IP (v4 or v6) address: %s\n",
+                   strerror(r));
+
+#endif /* CONFIG_IPV6 */
+}
+
 #define IADDR_NBUFS_SHIFT 3
 #define IADDR_NBUFS (1 << IADDR_NBUFS_SHIFT)
 
@@ -557,3 +598,89 @@ int iaddr_socklen(const union iaddr *ia)
     default:       abort();
     }
 }
+
+enum async_linebuf_result
+async_linebuf_read(struct pollfd *pfd, struct buffer_if *buf,
+                  const char **emsg_out)
+{
+    int revents=pfd->revents;
+
+#define BAD(m) do{ *emsg_out=(m); return async_linebuf_broken; }while(0)
+#define BADBIT(b) \
+    if (!(revents & b)) ; else BAD(#b)
+    BADBIT(POLLERR);
+    BADBIT(POLLHUP);
+    /* POLLNVAL is handled by the event loop - see afterpoll_fn comment */
+#undef BADBIT
+
+    if (!(revents & POLLIN))
+       return async_linebuf_nothing;
+
+    /*
+     * Data structure: A line which has been returned to the user is
+     * stored in buf at base before start.  But we retain the usual
+     * buffer meaning of size.  So:
+     *
+     *   | returned :    | input read,   |    unused    |
+     *   |  to user : \0 |  awaiting     |     buffer   |
+     *   |          :    |  processing   |      space   |
+     *   |          :    |               |              |
+     *   ^base           ^start          ^start+size    ^base+alloclen
+     */
+
+    BUF_ASSERT_USED(buf);
+
+    /* firstly, eat any previous */
+    if (buf->start != buf->base) {
+       memmove(buf->base,buf->start,buf->size);
+       buf->start=buf->base;
+    }
+
+    uint8_t *searched=buf->base;
+
+    /*
+     * During the workings here we do not use start.  We set start
+     * when we return some actual data.  So we have this:
+     *
+     *   | searched     | read, might   |  unused      |
+     *   |  for \n      |  contain \n   |   buffer     |
+     *   |  none found  |  but not \0   |    space     |
+     *   |              |               |              |
+     *   ^base          ^searched       ^base+size     ^base+alloclen
+     *  [^start]                        ^dataend
+     *
+     */
+    for (;;) {
+       uint8_t *dataend=buf->base+buf->size;
+       char *newline=memchr(searched,'\n',dataend-searched);
+       if (newline) {
+           *newline=0;
+           buf->start=newline+1;
+           buf->size=dataend-buf->start;
+           return async_linebuf_ok;
+       }
+       searched=dataend;
+       ssize_t space=(buf->base+buf->alloclen)-dataend;
+       if (!space) BAD("input line too long");
+       ssize_t r=read(pfd->fd,searched,space);
+       if (r==0) {
+           *searched=0;
+           *emsg_out=buf->size?"no newline at eof":0;
+           buf->start=searched+1;
+           buf->size=0;
+           return async_linebuf_eof;
+       }
+       if (r<0) {
+           if (errno==EINTR)
+               continue;
+           if (iswouldblock(errno))
+               return async_linebuf_nothing;
+           BAD(strerror(errno));
+       }
+       assert(r<=space);
+       if (memchr(searched,0,r)) BAD("nul in input data");
+       buf->size+=r;
+    }
+
+#undef BAD
+}