Correct port range logic for port generation

The existing logic (Range > 0) always triggered, because range is
guaranteed to be at least 1 (a single port has a range of 1, a
two port range (e.g. 80-81) has a range of 2, and so on). As such
this could cause ports that had a host port assigned to them by
the user to randomly assign one instead.

Fixes containers#8650

Signed-off-by: Matthew Heon <mheon@redhat.com>

pkg/specgen/generate/ports.go

@@ -107,7 +107,11 @@ func parsePortMapping(portMappings []specgen.PortMapping) ([]ocicni.PortMapping,
 			var index uint16
 			for index = 0; index < len; index++ {
 				cPort := containerPort + index
-				hPort := hostPort + index
+				hPort := hostPort
+				// Only increment host port if it's not 0.
+				if hostPort != 0 {
+					hPort += index
+				}
 
 				if cPort == 0 {
 					return nil, nil, nil, errors.Errorf("container port cannot be 0")
@@ -162,8 +166,8 @@ func parsePortMapping(portMappings []specgen.PortMapping) ([]ocicni.PortMapping,
 					tempMappings,
 					tempMapping{
 						mapping:      cniPort,
-						startOfRange: port.Range > 0 && index == 0,
-						isInRange:    port.Range > 0,
+						startOfRange: port.Range > 1 && index == 0,
+						isInRange:    port.Range > 1,
 					},
 				)
 			}
@@ -183,7 +187,7 @@ func parsePortMapping(portMappings []specgen.PortMapping) ([]ocicni.PortMapping,
 		for _, tmp := range tempMappings {
 			p := tmp.mapping
 
-			if p.HostPort != 0 && !tmp.isInRange {
+			if p.HostPort != 0 {
 				remadeMappings = append(remadeMappings, p)
 				continue
 			}

test/e2e/run_networking_test.go

@@ -97,6 +97,48 @@ var _ = Describe("Podman run networking", func() {
 		Expect(inspectOut[0].NetworkSettings.Ports["80/tcp"][0].HostIP).To(Equal(""))
 	})
 
+	It("podman run -p 80-82 -p 8080:8080", func() {
+		name := "testctr"
+		session := podmanTest.Podman([]string{"create", "-t", "-p", "80-82", "-p", "8080:8080", "--name", name, ALPINE, "/bin/sh"})
+		session.WaitWithDefaultTimeout()
+		inspectOut := podmanTest.InspectContainer(name)
+		Expect(len(inspectOut)).To(Equal(1))
+		Expect(len(inspectOut[0].NetworkSettings.Ports)).To(Equal(4))
+		Expect(len(inspectOut[0].NetworkSettings.Ports["80/tcp"])).To(Equal(1))
+		Expect(inspectOut[0].NetworkSettings.Ports["80/tcp"][0].HostPort).To(Not(Equal("80")))
+		Expect(inspectOut[0].NetworkSettings.Ports["80/tcp"][0].HostIP).To(Equal(""))
+		Expect(len(inspectOut[0].NetworkSettings.Ports["81/tcp"])).To(Equal(1))
+		Expect(inspectOut[0].NetworkSettings.Ports["81/tcp"][0].HostPort).To(Not(Equal("81")))
+		Expect(inspectOut[0].NetworkSettings.Ports["81/tcp"][0].HostIP).To(Equal(""))
+		Expect(len(inspectOut[0].NetworkSettings.Ports["82/tcp"])).To(Equal(1))
+		Expect(inspectOut[0].NetworkSettings.Ports["82/tcp"][0].HostPort).To(Not(Equal("82")))
+		Expect(inspectOut[0].NetworkSettings.Ports["82/tcp"][0].HostIP).To(Equal(""))
+		Expect(len(inspectOut[0].NetworkSettings.Ports["8080/tcp"])).To(Equal(1))
+		Expect(inspectOut[0].NetworkSettings.Ports["8080/tcp"][0].HostPort).To(Equal("8080"))
+		Expect(inspectOut[0].NetworkSettings.Ports["8080/tcp"][0].HostIP).To(Equal(""))
+	})
+
+	It("podman run -p 80 -p 8080-8082:8080-8082", func() {
+		name := "testctr"
+		session := podmanTest.Podman([]string{"create", "-t", "-p", "80", "-p", "8080-8082:8080-8082", "--name", name, ALPINE, "/bin/sh"})
+		session.WaitWithDefaultTimeout()
+		inspectOut := podmanTest.InspectContainer(name)
+		Expect(len(inspectOut)).To(Equal(1))
+		Expect(len(inspectOut[0].NetworkSettings.Ports)).To(Equal(4))
+		Expect(len(inspectOut[0].NetworkSettings.Ports["80/tcp"])).To(Equal(1))
+		Expect(inspectOut[0].NetworkSettings.Ports["80/tcp"][0].HostPort).To(Not(Equal("80")))
+		Expect(inspectOut[0].NetworkSettings.Ports["80/tcp"][0].HostIP).To(Equal(""))
+		Expect(len(inspectOut[0].NetworkSettings.Ports["8080/tcp"])).To(Equal(1))
+		Expect(inspectOut[0].NetworkSettings.Ports["8080/tcp"][0].HostPort).To(Equal("8080"))
+		Expect(inspectOut[0].NetworkSettings.Ports["8080/tcp"][0].HostIP).To(Equal(""))
+		Expect(len(inspectOut[0].NetworkSettings.Ports["8081/tcp"])).To(Equal(1))
+		Expect(inspectOut[0].NetworkSettings.Ports["8081/tcp"][0].HostPort).To(Equal("8081"))
+		Expect(inspectOut[0].NetworkSettings.Ports["8081/tcp"][0].HostIP).To(Equal(""))
+		Expect(len(inspectOut[0].NetworkSettings.Ports["8082/tcp"])).To(Equal(1))
+		Expect(inspectOut[0].NetworkSettings.Ports["8082/tcp"][0].HostPort).To(Equal("8082"))
+		Expect(inspectOut[0].NetworkSettings.Ports["8082/tcp"][0].HostIP).To(Equal(""))
+	})
+
 	It("podman run -p 8080:80", func() {
 		name := "testctr"
 		session := podmanTest.Podman([]string{"create", "-t", "-p", "8080:80", "--name", name, ALPINE, "/bin/sh"})