Set env vars when using -c

README.md

@@ -110,7 +110,7 @@ it will actually use `eth0:42`. To override this, manually specify an alias (e.g
 This error message could also indicate a bug in the TFTP code; try using an external tftp
 client (busybox in this example), by specifying the `-c` flag instead of the `-f` flag:
 
-`# nmrpflash -i eth0 -c "busybox tftp -p -l EX2700-V1.0.1.8.img @IP@"`
+`# nmrpflash -i eth0 -c "busybox tftp -p -l EX2700-V1.0.1.8.img \$IP"`
 
 ###### "Timeout while waiting for CLOSE_REQ."
 

main.c

@@ -67,6 +67,9 @@ void usage(FILE *fp)
 #else
 			"C:\\> nmrpflash.exe -i net0 -f firmware.bin\n"
 #endif
+			"\n"
+			"When using -c, the environment variables IP, NETMASK and MAC are\n"
+			"set to the device IP address, subnet mask and MAC address.\n"
 			"\n"
 			"nmrpflash %s, Copyright (C) 2016 Joseph C. Lehner\n"
 			"nmrpflash is free software, licensed under the GNU GPLv3.\n"

nmrp.c

@@ -43,6 +43,10 @@
 #define PACKED __attribute__((__packed__))
 #endif
 
+#ifdef NMRPFLASH_WINDOWS
+#define setenv(name, value, overwrite) SetEnvironmentVariable(name, value)
+#endif
+
 enum nmrp_code {
 	NMRP_C_NONE = 0,
 	NMRP_C_ADVERTISE = 1,
@@ -631,10 +635,11 @@ int nmrp_do(struct nmrpd_args *args)
 				status = 0;
 
 				if (args->tftpcmd) {
-					printf("Executing '%s' ... ", args->tftpcmd);
-					fflush(stdout);
+					printf("Executing '%s' ... \n", args->tftpcmd);
+					setenv("IP", inet_ntoa(ipconf.addr), 1);
+					setenv("MAC", mac_to_str(rx.eh.ether_shost), 1);
+					setenv("NETMASK", inet_ntoa(ipconf.mask), 1);
 					status = system(args->tftpcmd);
-					printf("\n");
 				}
 
 				if (!status && args->file_local) {